Holley carb jetting calculator. Just a daily driver, no racing.

Holley carb jetting calculator. Primary & Primary Secondary Primary Secondary Primary Carburetor Model CFM Renew Trick Secondary Main Main Jet Metering Metering Primary Discharge Part No. Dec 2, 2009 · Holley explains how the main jets on a four-barrel carburetor operate. Find the perfect Holley jet size with our expert guide! Includes tuning tips, size charts, and optimization tricks for your carburetor. Learn how to read a jet chart and find the right jet chart for your gasoline or E85 system here. Should you adjust the air bleed size or main jet size, this chart will allow the tuner to return the carburetor to the original jetting. Oct 12, 2022 · The secondary side of a Holley carburetor looks very similar to the primary side, and like the primary side it uses two jets to feed the circuit. And because of this, main jetting is often the cause of confusion in high performance carburetors. Carb was a Holley 650 double pumper but was modified sometime ago with a 750 Proform main body, Quick Fuel Billet Dec 22, 2015 · Quick Fuel Technology® (QFT™) ships carburetors only after they have been thoroughly run-tested and adjusted on a typical engine. Holley carburetors have a power enrichment system that provides fuel to the main power circuit during heavy loads or under full throttle situations. Sep 3, 2023 · A jet size calculator is a sophisticated tool designed to determine the appropriate size of the jet for carbureted engines. The "as delivered" jetting from Holley is very close to optimum for the majority of high performance applications. To calculate the proper jet size for your vehicle, you'll need to know your elevation and outside temperature. Jetting Charts: Single Nozzle, Throttle Body Plate, Interspooler, Money Maker, & Single Spray Bar Jetting Dry Single Nozzle, Throttle Body Plate, etc Jul 12, 2010 · I'm going to be installing a Holley Street Avenger (81770) on the 468 in my Chevelle. MaxJet Conversion Chart MaxJets™ allow you to accurately fine tune your carburetor. Just a daily driver, no racing. Thus, Holley can not guarantee an answer or timing on an answer. This allows you to tune your fuel curve to match your engine’s performance. Many folks buy a used carb at a swap meet or from an ad and find out that it wasn't what they thought they were buying. Here's what I have; pv 6. Home / Air & Fuel Delivery / Carburetor Components / Jets Metering Rods Bleeds / Main Jets Jan 6, 2002 · General Q & A - The perfect way of jetting a Holley - Full of questions tonight! How many of you guys determine your jet sizes by reading the plugs at WOT? According to the motor Bible (Dennis Moores BBC Marine Book), you are supposed to jet you carb at CRUISE, at which point you have 100% flow thru the jets. Although Holley employees will take part in answering questions from time to time, your questions may or may not be answered by Holley personnel. Understanding and utilizing this calculator can be crucial for enhancing engine performance and efficiency. Engine testing all carburetors prior to shipment ensures that when a new QFT™ carb is bolted on an engine, it will start, idle and perform up to the customer’s expectations. Nov 19, 2019 · If this is an area of interest, it’s best to search through emission- style carburetor applications on the Holley website (holley. If you look at a nitrous oxide system on a dollar-per horsepower basis, you’ll find that a nitrous system from NOS can provide the greatest value for each dollar of your precious investments. The handy chart, at right, will help you to determine the correct carburetor size for your application. This month’s Oct 2, 2009 · Looking for a chart that lists Holley jets and their corresponding drill size. When recalibrating the secondary side on such a carburetor a change of the secondary metering plate is required. However, sometimes a little more fine-tuning is needed because the customer has a Proper jetting is crucial for dialing in your nitrous kit tune-up safely. Regardless if you're racing professionally or just on the weekends for fun we have the equipment for you. Thanks Holley Type Carbs. com. This is done by increasing the Power Valve Channel Restriction (PVCR) passage size Many will look at jetting charts and infer from it the jet which is affecting carburetor circuit. 032,mains 69,IFR . Jan 7, 2020 · Attachments Holley_Jet_Chart. It all depends on how deeply you want to dive into the carburetor. Jul 4, 2019 · Tuning Holley carburetors isn’t difficult, but when it’s time to get into fine-tuning your street car, adjusting the fuel curve is a great path to travel. Carburetors are calibrated at 70° at sea level. It is recommended to cover the manifold bores when the carburetor is removed to prevent unwanted debris from entering the engine. 8 compression, AFR 195cc heads, 230/236 solid cam at about . These instructions demonstrate the correct installation of your new Adjust-A-Jet into the Holley carburetor. And Feb 21, 2025 · Typically, your standard Holley 4150 Series secondary jet sizes tend to be between 60 and 70, but that's not the whole story. Metering Plates Many Holley performance carburetors use a secondary metering plate, with drilled restrictions, rather than a secondary metering block, with removable jets. For example at wide open throttle the engine runs poorly, according to a jetting chart the jet to adjust is the main jet. Last edited by F-BIRD'88 on Fri Jul 29, 2016 1:59 am, edited 3 times in total. The chart shown is reference info and indicates the nominal size typically associated with jets in the specific numbered category. My question is for those who've had experience tuning these or similar carbs for altitude. An 850 cfm "double Holley manufactures each carburetor with a set of jets that will allow the carburetor to perform well at sea level and around 70 degree air temperature. Carter, Holley & Rochester to name a few. Jul 27, 2015 · If the idle jetting is about right this setting should be delivering a mixture that tends toward the rich side (see Figure 2. Until the main jets come into play, the engine relies on the transition slot for calibration. These jets have 1/4"-32 UNF thread and they are offered in a wide variety of hole sizes to allow fine tuning of your specific application. Holley explains how the main jets on a four-barrel carburetor operate. Once you know the correct stock jetting for your particular Holley carb, you can determine whether you live or race at an altitude above sea level. Holley is home to the top automotive performance brands including Flowmaster exhaust, MSD Ignition, Holley EFI, Hurst Shifters, Accel plug wires, Hooker Headers and many more. From engine swapping to managing up to 4000 horsepower, we have a solution for every project! Please be aware that this is a community forum. Car Craft Magazine Remove original carburetor flange gasket and scrape the carburetor flange of the intake manifold clean exercising care not to drop pieces of gasket material into the intake manifold. Tous Droits Réservés. Oct 14, 2022 · As part of this story we will focus on the tuning required for a particular HP 750 cfm mechanical secondary Holley carburetor at altitude. For a visual guide on locating your list number as well as help identifying other brands/models, check out this video! Oct 19, 2019 · Trying to get my old motor started as it has been sitting for a few years. Below is a chart for recording the jet and air bleed sizes for your HOLLEY ALUMINUM E85 ULTRA XP Series carburetor, as shipped from Holley. 2 days ago · A jet size calculator for recreation only that uses air density and jet diameter to adjust jet size for different conditions. Aug 21, 2015 · Holley categorizes jets by flow, not actual jet size. Too many people have no idea how jetting even works so this video is to Nov 19, 2019 · Don't just take your brother or your friend's advice and jam the biggest carb you can find onto your engine. pdf 45. It is a 350, roughly 9. Dec 3, 2018 · The traditional Holley four-barrel carburetor is incredibly robust, and the inevitable problems often have more to do with poor tuning than anything else. The vacuum operated power enrichment system is controlled by a Power Valve that times the operation to your engine's specific needs. About Holley EFI Find standalone EFI for LS, Coyote, Hemi and more at Holley. Nov 14, 2020 · 4412 carb on 194 with headers ,cam,Offy intake,HEI with Crane ign. Do you really understand what your carburetor needs to be in order for your engine to be happy? Let us explain the details you need to now before you choose your next Holley carburetor! The mechanical secondary carburetor is best on a lighter car with radical camshaft and a lower gear and manual transmission or on a car that is going to be used for racing purposes. No. 2016 Holley Performance Products, Inc. When it comes to calibration, Holley carburetors are base line jetted at sea level at 70 degrees F. You need to know the original jet size, density and diameter, and the new density and diameter for the new jet size. . Easily find the right jet sizes for your setup and enhance fuel efficiency today! Holley Carburetor Numerical Listings Carb. Finding the right Jet Size and Accelerator Nozzle Size - Holley Carb KruseBuilt 26. In an effort to help our Jun 4, 2023 · Find the perfect Holley jet size with our comprehensive guide. They facilitate the precise determination of carburetor jet size, optimizing the engine’s air-fuel mixture. 8K subscribers Subscribe In Holley’s quest for maximum performance and tuneability, this carburetor (0-80787-1) has been updated with a new metering block with changeable emulsion bleeds. How do you jet a carb on a motorcycle? Our calculator will give you the correct settings for your bike based on the desired altitude. Get tuning tips, charts, and expert advice to boost your carburetor's performance. New features include integrated drag racing transmission control as well as updated nitrous controls. An 850 cfm "double pumper" turns out to be a 650 cfm with vacuum secondaries. Holley Carburetor Numerical Listing Holley Carburetor Jet Size Conversions Jul 14, 2017 · For many, carburetor jetting and horsepower seem inexplicably linked. The following computation determines jet size changes for Holley carburetors based on environmental conditions. Jul 29, 2016 · Look up in the holley jet size/jet drill hole chart for the closest Holley main jet # usually on a holley 750 the secondary jet (no power valve) is 6 to 10 jet # larger than the primary jet, depending on how big the primary PVCR is. For example, a modified engine with increased airflow may require larger jets than a stock engine. In this article we help you determine the right secondary jet size, take you through some Holley carburetor jet kit options, and of course, show you how to maximize performance. Lengthy video on tuning the jets on your holley carb. com!​ From C8s to Silverados: Callaway & Holley Bring The Heat To LS Fest East Check It Out At Holley we have you covered from a wide variety of Helmets, Racing Suits, Racing Seats, Gloves, Harnesses and so much more. After installation, the result is instant; external, main fuel metering, with no change in fuel emulsion characteristics or any other tuning procedures, nor does the Adjust-A-Jet replace the metering block. To accommodate this re-jetting, just purchase jets up to four sizes above and below what is originally installed. Proper jetting enhances horsepower, efficiency, and overall engine performance. 21 on page 21). Kit Kit Needle Jet or Plate Block Block Power Valve Nozzle & Seat Size Below is a chart for recording the jet and air bleed sizes for your 4150 HP Series carburetor as shipped from Holley. 66 Nova. Our experience throughout the Jan 20, 2014 · JETTING (MAIN JETS): Due to varied applications that a universal performance carburetor will work with, no jets have been included in this kit; however a few tips on jetting are provided to help you understand their purpose. Jun 12, 2025 · Optimize your engine's performance with our carburetor jetting calculator. Did you find that the Holley recommendation of 1 jet size (decrease) per 2000' held pretty Dec 17, 2020 · How to ensure your Holley carburetor is using the right power valve for your engine. When you consider all of the options you have to get an engine to release all of the potential power it can, there is no equal to the ability nitrous oxide provides you. Remove original carburetor flange gasket and scrape the carburetor flange of the intake manifold clean exercising care not to drop pieces of gasket material into the intake manifold. This page lists Holley carb specifications, stock jetting and tuning tips. The video explains the various jet sizes, and how they affect engine performance. All rights reserved. For every 2000 foot increase in altitude, you can reduce the jet size by one size. But I want something that goes beyond 100 jets. Find out what jet size your carburetor had when OE. Holley 4 Barrel Carburater Information List Numbers and Stock Jetting One of the things we noticed over the years is the lack of information concerning Holley List numbers and the specifications for individual carburetors and their stock jetting. We measured all the restrictions and jets in this carburetor as shipped from Holley and have listed them in an accompanying chart. Shop the official site of Earl's Performance Plumbing and discover our selection of end-to-end fittings, hoses, and automotive plumbing solutions at Holley. Jul 11, 2024 · Calculate the needed jetting changes for temperature variations Specify the current jet sizes and temperature change to calculate the required jetting adjustments for consistent performance across different weather conditions in your carburetor. Please be aware that this is a community forum. ). Includes information on jet extensions, when and where to to use power valve block offs, using vacuum readings Carburetor Air Bleeds and Jets are a must when track-tuning your carburetor for maximum performance! Aug 25, 2023 · Carb jet calculators are essential tools in the automotive and engineering fields. Holley engineers have created several tuning avenues through the modular design, to create a proper air-fuel ratio pattern for just about any engine. Jan 9, 2020 · Whether you're looking for exploded views, tuning tips, rebuild information or more, check out Holley's in-depth Carburetor Repository. The idea is to convert currently-used Holley jet numbers to a "standard" environment, so that one can perform future calculations to other environments. I have seen all the charts for up to 100 jets. 199R11227 Revision Date: 9 Sep 29, 2020 · Holley EFI announces Version 6 of the Dominator/HP EFI software. 037. com) to find the specific carburetor for your application. A few The Holley Jet Size Guide is essential for optimizing carburetor performance. Out of the box jetting is extremely close for most applications. Mar 27, 2018 · The process to jet a carburetor correctly for high-performance or racing applications uses a similar method as to how you would tune a street car, except the size of the carburetor is different. The Power Valve circuit needs to have its flow increased also to bring the primary up to about 35% at WOT. It helps determine the correct jet sizes for specific engines, ensuring proper fuel flow and air-fuel ratios. Unlike other jet manufacturers, all MaxJets™ are pinned so that the hole size corresponds with the jet size. Many folks buy a used carburetor at a swap meet or from an ad and find out that it wasn't what they thought they were buying. We thought we'd address a few common One of the things we noticed over the years is the lack of information concerning Holley List #'s and the specifications for individual carbs and their stock jetting. The video explains the various jet sizes, and how Holley is home to the top automotive performance brands including Flowmaster exhaust, MSD Ignition, Holley EFI, Hurst Shifters, Accel plug wires, Hooker Headers and many more. 500 lift, Dart intake. Jul 1, 2008 · Almost everybody has a Holley carb but not everyone know how to tune them we show you how and help you learn the science and basics of carburetors. This process involves considering factors such as engine displacement, modifications, operating altitude, and intended use (street, strip, etc. Are those pretty close or way off? Sep 20, 2021 · Jet sizes. Motorcycle Carburetor Jet Size Calculator. Automatically and instantly get a near perfect result for the correct main and pilot jets based on your bike modifications, aftermarket exhausts, pod filters, altitude, ambient temperature etc. AIR BLEEDS Air Bleed Specifications4150 HP and 4500 DOMINATOR HP This page lists Holley carb specifications, stock jetting and tuning tips. How to select and install the right jets and power valves for your Holley carburetor. If the carburetor is too large, the pump shot will be con-sumed before the main system starts. The jets and air bleeds can be altered to deliver ideal fuel air mixtures under heavy throttle applications. If you are serious about tuning the idle and transition circuits for best results, especially maximum fuel efficiency usage, you start to appreciate a carb with replaceable air bleeds in the carb’s main Below is a chart for recording the jet and air bleed sizes for your 4500 DOMINATOR carburetor, as shipped from Holley. How to convert your carburetor to E85 For Carbed engines, you need to up the size of the jets to flow about 20% more for the primary, and 35% more for the secondarys, and tune from there. Specs listed below. This guide is tailored for Holley carburetors, including popular models like the 2300 and 4150, covering primary and secondary Mar 1, 2025 · A tool designed for Holley carburetors helps determine the appropriate fuel jet size for optimal engine performance. 5", pvcr . They also give instructions on changing the jets for increased performance. Lee Walker from Quick Fuel Technology explains how you can make sure you’ve got the right jets in your carburetor on race day. The larger the carbure-tor the higher the air flow required to accomplish this. 4 KB · Views: 8 Last edited by a moderator: Aug 16, 2020 Jul 27, 2015 · In about 80 percent of cases, a carb calibrated by Holley needs only minor main jet recalibration. The result is a “bog” or a “sag”. this info can translate to any holley 4150 and 4160 style carbs. headers. However, entrance condition, orifice finish, length, exit condition, and specific size within the tolerance can influence the actual flow a jet will produce. i08 b2dib uqids jiz7 lria ownphl 00atnv ufs sremck lowz