Throttle body cfm calculator. Either the CFM-Tech or XtremeFI TB would work.

Throttle body cfm calculator It is using Motec FI wil full datalogging, a liquid/air intercooler AND water/Methanol injection. The amounts can range from 5-25 HP depending on what other modifications are done to the engine. Aug 8, 2020 · We have been running a Holley 4 barrel type (1000cfm) throttle body on my dad's SBC. Performance Throttle Body Let your throttle body (TBI) or multi-port fuel-injected engine breathe! Choose a performance throttle body from our massive inventory and improve horsepower, drivability, and overall engine efficiency. Larger throttle body. 500" OD 471090 - 90mm Throttle Body 1170 CFM - 3. In turn, if you know the actual efficiency of the engine, and energy content of the fuel used, you can predict horsepower. 1) Has anyone run across a formula for calulating airflow through an EFI throttle body, e. Oct 14, 2017 · There, the 75mm stock throttle body causes a restriction that is ( ( ( (500*1. The throttle body runner is, in effect, a tube supplying a plenum and can be an effective Helmholtz resonator. Sep 10, 2023 · To optimize engine performance, selecting the right throttle body size is crucial. 62 square inches of throttle area is supporting 900 cfm. Aug 16, 2010 · A 383, stock heads, with cam, Redline at 5000 RPM, VE again at 78%: 519 to 648 cfm. Corsa Extremes. On a 300 EFI, it lookes like about 277 feet per second for a 75% ve engine reving to 4000 rpm with a 43 mm throttle body. i. 304/345 use 5. May 21, 2018 · A 2 litre engine, with a 7000 rpm rev limit consumes around 250 cfm of air at red line. Donny Walsh tuned 2012 Pony Package. Jul 31, 2005 · I spent a little time on the net today trying to figure the proper CFM required for my 331 stroker. May 26, 2013 · Here are a couple of flow numbers: Stock TPI/LT1 48mm Throttle Body w/o airfoil -- 783. GT 500 wheels. Sep 10, 2023 · For this engine, a throttle body size of approximately 425 CFM would be ideal. Picking the proper fuel injector size is critical for performance and tuning control. Apr 8, 2011 · Question. That was a royal pain putting that iron intake back on my brothers dually truck. You can improve flow in the primaries by removing the choke plate. Can anyone elaborate on this? This data is used to calculate the compression ratio. All CFM values are corrected for airflow at 28 inches of water. Forced induction: Turbocharged or supercharged engines usually need a bigger throttle body size calculator metric for more air flow. It will help you choose the correct turbo for your Apr 25, 2025 · Throttle body upgrades are popular modification for anyone looking to improve airflow in their intake system. So air speed through the throttle is about 322 feet per second. Racing engine size capabilities were determined at the flow CFM numbers provided by Rons Fuel Injection. An undersized carburetor will restrict airflow, leading to subpar engine performance, whereas an oversized carburetor can introduce excessive air, complicating Oct 28, 2017 · How to go from CFM @28" to throttle diameter? I pulled the data on Accufab's web site and regressed the CFM number of the throttle body diameter in mm squared. This causes problems with throttle response, you may only have 2/3 the pedal travel to get full flow. According to this calculator the Titan needs a 71MM throttle body for best power distribution throughout the RPM range (OEM is 72MM). Using the throttle body size, throttle area, temperature, pre and post throttle pressures,the ECU can very accurately calculate air flow through the throttle body and therefore into the engine; this is known as the TMF Oct 1, 2025 · This turbo size calculator gives the numbers you need to analyse turbo compressor maps so you can find a good turbo for your engine. I see tons of intercooler setups with 2. I came up with about 574 CFM and I am wondering if this correct??? :: Explore high-quality throttle bodies, fuel rails, and injector components for fuel injection systems to enhance performance and efficiency. Nick Williams CNC precision machined billet throttle bodies are made to meet the demands for increased airflow on the "drive-by-wire" LSX performance engines. 1662. It also contains all tuning information. A 1,000 cfm throttle body will work fine on an engine making 200 hp. They flow 160-170CFM depending on the model you choose. I would recommend a TB from about the same size engine or larger. increasing power is in large part the result of increasing the amount of air Dec 5, 2009 · I am looking to find out the maximum airflow that you can push through 2. Whether you’re tuning for better throttle response or aiming for more power at higher RPMs, choosing the right throttle body size is crucial. Air Filters The amount of horsepower an engine makes is directly related to the mass airflow of the engine. Nov 6, 2013 · A throttle body does not. Rons mechanical fuel injection throttle body Sep 10, 2008 · Hello, I am new here. 9L) I would imagine that RPM, torque range, bore and stroke, intake runner length, valve sizing, cam timing, CFM May 23, 2016 · The obvious solution is to use a throttle body with a really big bore but, in fact, that is the wrong approach. The throttle plate can be placed at any location on the intake runner so you can see that the location of the butterfly will largely dictate the size it should be. 8cfm @ 20. How much CFM do I need for my engine? The formula for calculating how much CFM (cubic feet per minute) your engine requires is: CFM = Cubic Inches x RPM x Volumetric Efficiency ÷ 3456. Injector flow rates are flowed at 43. Gotta love the days when engineers didn't know that EFI didn't require the same principles as a Carb The blades are 1. an X-mm throttle body can flow Y-cfm? 2) Is there a way to correlate injector fuel flow to airflow? I have found that the OE puts very little extra fuel flow in stock EFI Carb/TBI CFM Calculator Required Intake CFM This calculator will help you determine your engine's intake volume requirements. Applications of Throttle Body Size Calculator Throttle body size calculators are versatile and applicable in several scenarios: Applikazzjonijiet tat-tlielaq For high-performance racing vehicles, getting the throttle body size right can mean the difference between victory and defeat. 2. I have 4600 CFM on mine and can drive it like a 2 barrel around town, Now I would suggest for drivability sake more smaller blades than one big one. The stock TB even with the ultimate TBI mods (520 cfm) would be too small IMO. 9 cfm TPI/LT1 52mm Throttle Body w/ airfoil -- 898. The bottom end and valve train will support 9000 RPM when we are ready to really lean on it if the occaision arises. We carry all the top brands—Edelbrock, JET, BBK, Holley, FAST, Ford Performance, Professional Products, and many more! Apr 22, 2003 · How did Ford (or any other manufacturer, for that matter) arrive at the various throttle bore diameters used in a long-runner port-injection motor? (for example, the late, great 4. Comments, corrections, additions more than welco How much HP does a performance throttle body add? Gains from a throttle body can be dependent on modifications. 125" OD 471075 - 75mm Throttle Body 915 CFM - 3. 750" OD Jan 8, 2021 · How to Make Power with a Chevy TBI V-8 Tips for adding power to a throttle body injected (TBI) Chevy 305, 350, or 454 V-8 engine. Enter the engine displacement and the anticipated maximum safe engine RPMs (typically known as redline). Starting in the late 1960's the choke thermostat moved down to the throttle body. The coefficient on that is about 0. 80% efficiency. Air speed through a 3 inch intake/throttle body at redline is around 55 mph Air speed through the panel filter with an area 10 times as large as a 3 inch the intake pipe is 5. Apr 22, 2003 · It revs to 5500 rpm or so. Here are some guidelines. 25", 2. Nov 5, 2002 · Went back to the ole EFI throttle plate calculator site, and ran some numbers for the various carburettors and popular EFI Throttle Plate combinations. Dynotech DS . You can also calculate by Aug 7, 2002 · To find the CFM ratings for a throttle body is going to be more difficult, unless you happen to choose an Accufab throttle body. 750" bores, was claimed to flow 900 cfm. On a twin throttle body 300 EFI, I'd say 173 cfm for a hot I6 reving to 5000 rpm lookes just fine. Jul 14, 2018 · Rons Fuel Injection has provided us with air flow data for their throttle body setups. Mar 25, 2019 · For you airflow engineers. Either the CFM-Tech or XtremeFI TB would work. To find the cfm requirement for your engine, try to our easy Online CFM Calculator. 1567* (diameter in mm)^2. VE is affected by intake type, camshaft grind and type, boost, and many other factors. What information do I need from them and how do I calculate the size of the TB? Is there any relationship between the Cv data and The correct sized throttle body is critical to ensure you aren’t placing a restriction in the inlet airflow that will limit power, however it’s more common for people to fit a throttle body that’s too large which then provides very poor control of airflow, particularly at small throttle openings. Free Online App. I know that EFI vacuum testing for cfm is different than for carbs. This ensures optimal performance Oct 28, 2017 · How to go from CFM @28" to throttle diameter? I pulled the data on Accufab's web site and regressed the CFM number of the throttle body diameter in mm squared. Nick Williams has released a redesigned version of their 103mm throttle body with a new, stronger electric motor that prevents the blade from closing under high boost levels. This instruction sheet does not include How is it measured? Carburetors are flow tested by the manufacturer and assigned a cfm rating. Compute engine CFM estimate required carburetor or throttl… with this free tool. 1567 from my regression, and the 95% confidence intervale is 0. Feel free to get in touch to receive the proper credit. - Solex 30 PICT 2 – no choke assembly 71. Aug 15, 2011 · This CFM calculator is designed to give the engine's air intake volume requirements. I have written an approximate CFM estimator so I have guessed the CFM's at 1. I'm under the impression the flow rate of these two carburetors is very close, so what Nov 2, 2008 · Keep in mind even the factory 502 cubic inch big block used the stock L98 TPI throttle body size and made 500 horse power yes a 58mm can potentially increase hp if your engines highly modified and your still using a stock 48mm throttle body, but its hardly a big restriction, and your probably going to gain more with other mods Holley's new 1000 CFM throttle body shares the same air entry area design that powers every NASCAR Sprint Cup Series™ car. This is why some extremely high power engines appear to have quite small ITB''s because the placement is closer to the valve, while other engines appear to have overly large ITB''s. Throttle Body and Main Venturi Sizing When deciding upon an appropriate throttle bore diameter for your carburetors it is easy to err by over-sizing them in the belief that a larger bore size will deliver more power. The Engine Parameters calculator is designed to assist with engine modifications by calculating various engine parameters. T-56 Tremec. The total area of the venturi circles was 1. 125" OD 471070 - 70mm Throttle Body 830 CFM - 3. Apr 26, 2006 · Then I was reading some information on another website and they were talking about how to calculate how much cfm each size throttle body can flow - you just need to figure out how much your engine can flow and go 10% larger on the throttle body. 1. 98" squared, now it's 3. 94 square inches of throttle area, so the 75-mm throttle body is a little larger. For example this info from Wilson Manifolds 90mm-- 1170 CFM 95mm 1450 CFM TB size increase by 10mm CFM Increase of 280 CFM Technologies sells and manufacturers Magazine + TV Featured performance parts for GM TBI , Throttle Body Injection, along with custom carburetor spacers and the famous HVH Super Sucker Carb Spacers. Dec 31, 2004 · Do you start killing throttle response just the same because your knocking the velocity down? Also, how would I convert throttle body millimeter sizing to a cfm number that would probably make it easier since I know roughly what cfm you usually match to X amount of HP. Model 80496 Holley 950 uses 1-3/8 venturi and 1-3/4 throttle bores. Taking the point estimate says that TBCFM = 0. It outputs the pressure ratio, lbs/min and CFM numbers which can then be plotted onto turbo compressor maps. Carb/TBI CFM Calculator Required Intake CFM This calculator will help you determine your engine's intake volume requirements. 5" the venturis were 1. Dec 21, 2022 · Happy hump day! I have some more data to share to help you choose a throttle body size for your engine. Aluminum Throttle Body Spacer $69. 5", and 3" piping. Nov 21, 2001 · A throttle body is a lot shorter than a "pipe", reducing the pressure drop across it, furthermore, a TB is usually smooth and polished, whereas an exhaust pipe has a rougher surface, reducing flow somewhat. Jan 4, 2022 · Employing the calculation of CFM through a pipe and using 100 m/s for the variable of velocity (this number has been used for port design for 30+ years as the maximum speed for inertia tuning while keeping the velocity low enough to minimize boundary layer disruption) we can calculate CFM flow rates through various throttle body sizes. Motion Raceworks is here to help with the ICON 92 and 102mm throttle bodies. We analyzed the power potential of these simple and very popular fuel injection systems. Oversize TBs are readily available, but they don't come with any sort of recommendations or technical info to help with the decision. Dec 3, 2020 · This carburetor calculator is designed to give the engine’s air intake volume requirements in Cubic Feet per Minute. Sep 8, 2022 · The engine manufacturer should specify the technical information required for this air consumption (CFM). Grabber Blue. d. This means that 9. CFM Technologies sells and manufacturers Magazine + TV Featured performance parts for GM TBI , Throttle Body Injection, along with custom carburetor spacers and the famous HVH Super Sucker Carb Spacers. It is not uncommon for a given physical size (see Carburetor sizes paragraphs) to have many different internal venturi sizes. Feb 27, 2009 · With a couple recent posts referencing this I will list what I *think* I know about the "B" carbs though I am still learning. Mar 1, 2008 · Then I used 664 and 924 (both done under 28" by the TB manufacturer) for a throttle body, then I got 521 for the CFM that a 300 cubic inch engine can get at 100% VE at 6000 RPM. The calculator will tell you the cfm range you need. unless you change out the tiny cam your not going to get a benefit from a larger throttle body. 125" OD 471080 - 80mm Throttle Body 965 CFM - 3. Download high-quality Throttle Body Size Cfm Calculator Images & Photos for educational projects and activities. Does someone have the TB scalar info needed to change in the tune available? Thanks in advance! Apr 2, 2015 · From the parts required FAQ. To calculate an exact throttle body equivalent use a shortcut by working in percentages. So if you don't know already, the bore size of a throttle body is like picking the venturi in a carb. This article delves deep into how one can make this choice accurately using a calculator, ensuring your engine performs at its peak. If you want a more personalized cfm rating, you can calculate the number yourself. 8 cfm Really, I like the 58 mm TB's but they're not really CFM ratings are more accurate than physical carburetor sizes, as the CFM rating takes into account the venturi size of the carburetor. 3, 5. You will need to know your engine's: Displacement (in c. 7 TB's are all the same ~500 CFM with 1 11/16" bores. Does any one know how many CFM's of air the stock throttle body will flow ? 2011 GT. If the throttle body chosen is too large it can't flow any more air it just reaches max flow at partial throttle. From sizing to which attachments to what intakes are compatible with what throttle body, the market is full of choices but not answers. Blown engines, typically over 100% or higher, depending on amount of boost. This can make it difficult to control the engine torque, making it difficult to drive the Fill in the blanks below to calculate your carburetor size. This calculator will show you the Nov 19, 2022 · What does a 90mm throttle body do? This throttle body will increase airflow to your engine adding more horsepower and torque to the wheels. Feb 27, 2017 · Venturi and throttle bore size determine cfm in this classic single-pump 750-cfm 4160 Holley. Comments, corrections, additions more than welco Oct 1, 2025 · 5 intercooler size calculator. Jan 2, 2010 · The only advertised numbers I've seen are 1170 cfm for a Wilson 90mm and 1520 cfm for a Wilson 105mm. Jan 22, 2012 · Recall that the 750 cfm Holley had 6. Chevrolet 2GV Carburetor Another choke arrangement, used mainly on Chevrolet engines was the 2GV, in which the 'V' referred to the choke coil being remotely mounted on the manifold. The 454 is larger with 2" bores and near 700CFM. I know a ton of you are running the CB Panchito's. 0 INTRODUCTION Holley Performance Products has written this manual for the installation of the TERMINATORTM EFI TBI fuel injection system. Jan 21, 2024 · What size carburetor do you need for your engine? See the details in calculating CFM in this edition of Piston Slap. 5 days ago · Calculate CFM from actual vacuum reading of carb Drag Racing Calculators,Calculators to find 1/4 mile ET and MPH, CID,Piston Speed,gear ratio,carburetor size,margin of victory,Engine calculator, Calculates relative horsepower, air density, density altitude, virtual temperature, actual air pressure, vapor pressure and dyno correction factor and more. How to Use the Carburetor CFM Calculator To estimate the required carburetor CFM for your engine, input the engine displacement, maximum RPM, and volumetric efficiency. So if your engine has a maximum airflow requirement of 400 cfm, you'll need a carb or throttle body that significantly exceeds that cfm rating in order to deliver air WITHOUT RESTRICTION (vacuum drop) at the desired flow rate. Oct 5, 2013 · I found this site that calculates the proper TB size based on engine displacement. Picked up a FAST brand 4 barrel type which is rated at 1375 cfm. 9 cfm TPI/LT1 52mm Throttle Body w/o airfoil -- 848. The throttle body features integrated throttle position, idle air control, and intake air temperature sensors. When we don’t have the airflow numbers, we can use the general rule of 2. This carburetor cfm calculator will help you to estimate the correct carburetor size for your engine. Also not going to get any benefit unless the intake is bored to match the throttle body. Get it out of the box and noticed right away Sep 7, 2008 · An engine is an air pump (we all know that already) and it can only move a given amount of air at it's max rpm. Knowing how carburetors work is key to making your engine run smoothly. Jul 11, 2024 · Engine displacement: A cfm calculator for engine size can figure out the best throttle body size for your engine’s size. The bottom line is: calculate the CFM requirements of your particular engine. Tuning Throttle Body Area Throttle Mass Flow (TMF) as the name indicates, is the rate at which air mass is flowing through a throttle body in units of grams/second (g/s). It is designed to calculate the effect of some modifications. Now, by making the throttle body element flow say 1060 CFM reduces the loss to 20 hp and picks up 8 hp. Jul 29, 2011 · In the case of the '05-up GT, the flow rate of the complete induction system is only 509 cfm, a significant drop from the 890 cfm offered by the throttle body alone. Throttle body- TB- The 2. 0 and 5. of mercury 60mm Ford 526 cfm 65mm AccuFab 616 cfm 70mm BBK 726 cfm 75mm AccuFab 845 cfm 90mm AccuFab 1190 cfm 90mm AccuFab 1225 cfm Solex Carbs. Jul 20, 2021 · It's important to flow test a performance throttle body and find the CFM. The Calculation for Max Horsepower is straight forward. This calculator is not designed to estimate engine power or efficiency. As a comparison, my TBI throttle body, with four 1. BBK 90mm Hemi throttle bodies are CNC machined from high quality 356 aluminum castings to ensure perfect OEM quality and fit every time. If the throttle body runner is of the right diameter and length, Helmholtz tuning can be used to great effect. For a ball park figure a 600 cfm with vacuum secondaries on a 302 modified without power adders is a pretty solid choice, if it is a stock engine then Ordered a 103mm NW throttle body for my Bolton Grand Sport with MSD manifold. 5" Hg (the 4v standard). It is possible to induce turbulence by going with too large of a throttle body. Billit LCA's. I used 5100 rpm for peak HP and 340 cubic inches. Air demand is about 408 cfm. Single port manifold 96cfm @ 20. Does someone have the TB scalar info needed to change in the tune available? Thanks in advance! Summit Racing's web site has a CFM calculator. 5" pipes, but am trying to figure out at what lb/min each size will become a restriction. Calculate Throttle Blade Diameter for individual runner manifold or motorcycle carb The Sniper 2 EFI is a self-tuning, easy-to-install EFI system that enhances classic 4-barrel carburetors with 14 new features for smoother drivability, compatibility with the Sniper Ecosystem, optional Power Distribution Module for simplified wiring, and robust support for high-performance engines up to 650hp, all designed to provide a modern fuel-injected experience with minimal installation Dec 4, 2009 · Is there a formula to the CFM of a throttle body based on its size? How much CFM would a 85mm throttle body be equal to? May 23, 2014 · TPI Intakes and runners The following airflow tests were performed on the University of Northwestern Ohio's SuperFlow SF600 Flow Bench. How many engines are making enough power that they require a 40mm venturi? Not too Sep 10, 2025 · Enter the total amount of air flow in cubic feet per minute (CFM) into the calculator to estimate the horsepower of the motor. American Racing headers/high flow cats 560 rwhp. I've searched this site and google to no avail for a calculator, and Nov 5, 2011 · 1987 - 1996 F150 & Larger F-Series Trucks - Throttle Body Size/CFM/Supports x Horsepower Chart - I put together this spreadsheet for everyone's reference comparing square surface area across throttle body bores, cfm airflow capability, and what type of horsepower your particular throttle body should support. Oct 1, 2008 · I get asked frequently if installing a larger than the stock 48mm TPI throttle body will significantly help on a corvette engine, Ill save you some reading right off if you want, yes a 58mm can potentially increase hp if your engines highly modified and your still useing a stock 48mm throttle Dec 18, 2009 · Can someone please explain the advantages/disadvantages of using a large or small throttle bore to venturi size ratio on a comparable flowing carburetor? For instance: Model 9381 Holley 830 uses 1-9/16 venturi and 1-11/16 throttle bores. Generally speaking, anytime a throttle body is added, there will be some added horsepower. 5 times the horsepower of the engine to get an approximate amount of air required. The turbo is quite LARGE however. Enter the engine's displacement, Volumetric Efficiency, and its redline. SPR Performance offers a 54mm bored 750/800 cfm throttle body. We just built a new motor and wanted to go bigger on the throttle body but stay in a 4150 pattern. Dial in cfm for optimized performance! Fill in the fields below (example: 5000 RPM), click calculate, and we’ll show you the optimal cfm for the street and track! Dec 25, 2023 · Knowing your engine’s CFM is essential for ensuring it receives the right amount of air to operate efficiently. Because the Accufab throttle bodies are designed to “race engine specs”, the flow ratings are going to be greater than most of the other aftermarket throttle body designs, so don’t automatically expect a “75 Aug 11, 2021 · Choosing the correct throttle body in today's market for your LS engine can be particularly confusing. For example this info from Wilson Manifolds 90mm-- 1170 CFM 95mm 1450 CFM TB size increase by 10mm CFM Increase of 280 How to Calculate Cubic Feet per Minute (CFM) Engine size (CID) x maximum RPM / 3456 = CFM (Example: 350 CID x 6000 RPM = 2,100,000 / 3456 = 608 CFM) This is calculated at 100% Volumetric Efficiency (VE) for Wide Open Throttle (WOT). This calculator calculates CFM requirements for an engine. Click ‘Calculate’ – The value will be returned in C ubic F eet per M inute (CFM) required based on the entry values you have made. Use our CFM calculator to accurately determine the optimal carburetor size for your engine, ensuring peak performance and efficiency. 0/5. 65cfm @ 20. Ford and GM transmission kick down levers as well as all necessary vacuum ports. Thanks goes to whom ever was the original author of this mathematical calculation function that we used as the basis of this webpage. All FuelTech engine management systems are capable of driving stock injectors to massive 850 lb/hr injectors. Find the correct intercooler size, your intercooler efficiency, flow loss, air density increase & intercooler pipe size CFM Calculator Calculating the CFM airflow in a room is crucial for maintaining proper ventilation, temperature control, and overall air quality. Nov 16, 2009 · Throttle Body Selection With a Pocket Calculator by: dacaman12 An LX member sent me a message asking, "What size TB do I need?", and I realized that there really wasn't a clear answer to his question. The restriction of the venturi in the throttle body probably provided better fuel vaporization (just like it does in a carb) but likely the most important reason was to provide a desired pressure ratio between the intake and exhaust for metering the EGR. Jul 6, 2005 · This invloves some guesswork. May 22, 2006 · This is a two part question. For 100% air density, horsepower capabilities were also determined. 3:73 manual. However, a Small Throttle Body will limit the max horsepower rating. Oct 16, 2020 · How do you calculate CFM for throttle body? CFM = (350 x 6,500) ÷ 3,456 = 658 cfm at the power peak These are the engine’s theoretical air requirements if we didn’t have all sorts of interference and restriction from carburetor venturis and throttle plates, manifold runners, intake ports, valves, and so on. With our engine cfm calculator: V [in3]=CID. Oct 6, 2005 · There is a big difference in sizing between Individual Throttle Bodies (ITBs) and a throttle body that feeds a plenum for all or at least more than one cylinder. Mass airflow is determined by volumetric efficiency VE, and the density (pressure-and-temperature) of the air. Thanks for any input. ), and Maximum rpm. How many CFM does a 105mm throttle body flow? 1520 CFM Wilson Manifolds 105mm Throttle Body – 1520 CFM – 4. 6)/896)^2)/14)*500 = 28 hp. Dec 15, 2013 · I machined out the venturi portion of my 2bbl ford CFI throttle body to throttle blade size. 1300 CFM throttle body would reduce the restriction to 13 hp and pick up 15 hp over the stock throttle body. Explore StrikeEngine Find performance parts on ebay Make: Model: Type: Nov 21, 2001 · A throttle body is a lot shorter than a "pipe", reducing the pressure drop across it, furthermore, a TB is usually smooth and polished, whereas an exhaust pipe has a rougher surface, reducing flow somewhat. Explore StrikeEngine Find performance parts on ebay Make: Model: Type: Jul 18, 2024 · The throttle body’s size affects how fast and much air flows, which changes how the carburetor works. Jun 26, 2003 · In other words, zero pressure drop. Nov 3, 2004 · Ford Throttle Bodies- Size Make CFM flowed @ 28in. Feb 25, 2025 · Using a throttle body size calculator provides a starting point for selecting an appropriate throttle body. However, subsequent adjustments to the fuel delivery system, including injector sizing and tuning, are crucial for realizing the full benefits of the new throttle body and achieving optimal engine performance. The calculations are quite a bit below what marine Apr 22, 2003 · It revs to 5500 rpm or so. This arrangement was used until the last domestic automotive application in 1979. The injectors are different sizes. 99 Add to Cart Black Anodized Billet Aluminum 1000 CFM Throttle Body with TPS $749. This manual contains the information necessary for the installation of the hardware contained in this kit, which includes the ECU, wiring, throttle body, and sensors. 54" squared. I have a customer asking how to size a correct throttle body for their engine? This TB will control the fuel (NG) line, not on the mixer line. These Jan 24, 2015 · You can calculate the area of a large single throttle body or the combined area of a multiple bore throttle body. 7. Looking at different size throttle body, its very clear that as the size of the TB increases that the flow of it that changes is not linear. 8l with 1 3/8 bore is ~240CFM, the 4. The function of the carburetor is to ensure the right mixture of fuel and air before it enters the engine. It is true that larger throttle bores combined with larger venturis are needed to produce higher power outputs but only when the engine is designed to need these larger diameters The CFM (Cubic Feet per Minute) Calculator is a valuable tool for determining the appropriate carburetor size for your engine. So we should be able to support 240 cfm with 240/900*9. This calculator needs your engine capacity & your desired boost pressure in PSI at your desired RPM. 1471-0. 5mph. 95 Add to Cart Idle Air Control Valve (IAC) Use FREE Throttle Body Size Cfm Calculator Pictures for Classroom Lessons. Racemaster DR's. Centerforce DF. I'm not looking for opinions, I am looking for the math to Jan 31, 2011 · There are several factors in selecting a carburetor, like what is the maximum rpm, what rpm range is used for maximum power, how many cubic inches is the engine, is this a street car,or street/strip or all out race car, like drag or track, etc. Feb 22, 2019 · For you airflow engineers. 250 OD (Ford Style) : 471105. 4in. Use this calculator to estimate approximate BHP available with different throttle sizes. Mar 13, 2001 · I am installing a 65mm throttle body on a 2275 project I am doing for a customer. of mercury Solex 28 PICT 64. Fuel Injector Size Fuel injectors are the main factor in both minimum and maximum horsepower rating of EFI systems. 57 square inches. 125". 471065 - 65mm Throttle Body 745 CFM - 3. Thanks! Enter Engine CID: Enter Max RPM: Enter Volumetric Efficiency: * Required Intake CFM This calculator will help you determine your engine's intake volume requirements. 5 PSI on an injector flow bench using test fluid with same density as gasoline. Quickly calculate carburetor size, CFM, and jet size with our Carburetor Calculator. Maximum Air Intake Requirements CFM. 62 = 2. Calculate the separate areas and multiply by the number of bores in the carburetor or throttle body. Ideal for performance tuning and engine optimization. Procharged. Calculate your engine's airflow needs with our Engine CFM Calculator for optimal performance and efficiency. Dec 14, 2018 · Looking to add an aftermarket throttle body to your Mustang but not sure what size to get? Check out our throttle body size guide for stock Mustangs. g. Dec 5, 2009 · I am looking to find out the maximum airflow that you can push through 2. FuelTech offers a Fuel Injector Calculator to assist racers and builders select the proper fuel injector sizing. 0 cfm (500 HP and 500 TQ on a RamJet 502) Stock TPI/LT1 48mm Throttle Body w/ airfoil -- 821. rpfuzz bmlcc rhdjvot van smjf psdnu vzjruo uim rwrztf ikmc whil efhkvc lynfo dsbl wat