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The blower that has the most parts available is the 6-71. requires dyno tuning to ensure the fuel system and ignition are tuned correctly. 8:71 Rotor dia=5.778", length=15.905", displacement per full turn of rotor=436CI. Source(s):https://shrinks.im/a8vjz. Since the upper pulley is larger than the crank, it is 20.6% underdrive. A The Roots blower is the simplest of all blowers and therefore is also the least expensive. sales@powerlinecomponents.com International: 1-307-885-4724 US (Toll Free): 877-885-4724. See all 28 photos. The numbers related to these blower sizes, such as 142, 177, and 256, relate to the amount of air in cubic inches that is pumped by the blower in one blower revolution. Now imagine, on an ascending scale, that the 30″ Hg is 0 psi and the 0″ Hg is 14.7 psi and you have an “absolute” pressure gauge. There are many different styles of blowers that came off the diesel engines. Contact either BDS (Blower Drive Service) or Dyers for … Our blower kit is usually installed in four to five hours. The forging process DOES add grain flow and add strength to the part as above, but it is primarily the higher material Ultimate Tensile Strength (UTS) and Yield Strength (YS) that make it strong. I run 2-750 mech secondary holleys. GMC also made 53 cu in (869 cc) series in 2–, 3–, 4–, 6–, and 8–53 sizes, as well as a "V71" series for use on engines using a V configuration. Get your answers by asking now. ... How tight should I run my blower belt? A No. It is actually an air pump. 14:71 Rotor dia=5.778", length=19.000", displacement per full turn of rotor=521CI This is theoretical displacement. Should Trump receive the COVID-19 vaccine? To calculate the drive ratio, take the difference between the 2 pulleys and divide that number by Thom Taylor Author. For street engines on 93 octane pump gas, a common figure is 1.5hp/CID. This includes hooking up the fuel lines its a super charger,like you might see on a dragster.it forces more air in engine create more horsepower the 8-71 means it can displace71 more cubic inches of air and fuel per 8 cylinders. Why is my sense of direction so bad when driving? Note: This boost does not show up on a typical 0-20 psi / 0-30″ Hg gauge as 14.7 but instead as “0” on the 0-30″ Hg scale. This would cause the engine to run very lean at max boost. What's behind the flaps when your luggage gets automatically transported outside. Contrary to popular belief you may need larger carbs, depending on boost and rpm. Have one coming for sale soon and also a Hi Helix that is direct availible. The yield point is the point at which a part first starts to plastically deform. street/competition blower. This The v series blowers have angle The only cores of any use are Weiand's 8-71 blower kits are equipped with reconditioned GM three lobe rotors for peak performance under demanding high RPM conditions. The 4-71 and 6-71 designations were originally used by GMC to identify a blower as sized for a six-cylinder diesel engine with 71 ci per cylinder, which works out to 426 ci. A stage 1 modification can be added in isolation. Join Yahoo Answers and get 100 points today. Theres a couple guys over in the competition section running blown alcohol / fuel and I'll guarentee they will be able to get right into the meat / theory of cubic inches of blower vs. cubic inches of motor,,, psi, etc. On a street driven vehicle, you should use spark plugs that are 2 heat ranges hotter than the The Littlefield blower I'm running on my present boat came from a friend who replaced it with a brand new 8-71 from Summit. This means that a true stage 1 modification part does not require any other engine modifications to get it to work. Rotors are billet alum. The maximum hp available for gasoline engines is 2.0hp/CID @ 15 lbs of boost. the lower pulley. street/competition blower. The blower that has the most parts available is the 6-71. and alternator are mounted to the side of the engine where it will not interfere with the blower Are Chevys reliable or do they give a lot of problems? These are at the bottom end of the tuning scene in term… Or does it have sides that are angled down and out about half way then angle back in? Fresh Littlefield 8-71 6% over 2 1050 dominators Long block is new Blower is fresh from Littlefield Carbs are old with new Holley kits This is in a jet. plug. Aftermarket derivatives continue the trend with 8–71 to current 16–71 blowers used in different motorsports. Fluid is trapped in pockets surrounding the lobes and carried from the intake side to the exhaust. 10:71 Rotor dia=5.778", length=17.000", displacement per full turn of rotor=466CI. Billet belt tensioner components and V-belt pulleys round out the package to give you everything necessary for installation. The 750`s are stock blower carbs. Whilst other mods can help to raise the power gains and realize the full potential of the mod they are not mandatory. Add the 20 psi to the 14.7 psi and the gauge markings would be 0-34.7. You really need to do some research before building a blower motor. 16 oz 10-71 14-71 sometimes take about 20 oz. Unfortunately, 6-71 and 8-71 usually take approx. The plugs still show lean. The v series blowers have angle hold downs on each side (4 total angles on the 6v71, 6 total angles on the 8v71). The compression of the inlet charge (creation of boost) actually takes place in the cylinders and the manifold. BTW the hats are also pretty important for the performance of the blower. May 9, 2013. The blower belt adjustment should be done with the motor cold, and have 3/4″ deflection in or out on the long side of the belt. If you are looking for a used Littlefield 8-71 Hi-Helix Retro Fit send me a PM or drop us a mail to info@seasideaffair.com. The first run the plugs showed lean. the necessary bolts, pulleys, and gaskets. hold downs on each side (4 total angles on the 6v71, 6 total angles on the 8v71). The most common application of the Roots-type blower has been as … BDS 6-71 polished alum. To run any blower much less the large 8-71, you must build your engine for it. Roots blowers are often referred to based on a number like 8-71 or 14-71. Located in the Netherlands Europe. So a Carburetor does not understand pressure because it supplies fuel by creating a pressure drop across the venturi. The engine needs to be built to work with the blower, but in general you can build a milder engine with a blower to meet your performance goals, compared to the engine you'd have to build to go that fast without a blower. Lv 4. I have a 502 with 8-71 blower. Assuming a constant speed ratio between the engine and the blower, a larger blower will make more boost than a smaller one on the same … Under Normal driving conditions, you should PICK UP around 3 mpg over a normally aspirated engine. Centrifugal superchargers and screw … There are 4-71, 6-71, 6v-71, and 8v-71 Cores. The modern 6-71 and 8-71 blowers are capable of moving more air than the original ones, due to improvements to the design. does tint prevent windows from shattering and going everywhere? mounting area. The blower uses double lipped Teflon seals to provide superior seal on the rotor shafts with hi-speed … According to Weiand, you typically want to run larger blowers on larger engines. A. The 6-71 blowers can be made to work by douple pinning the rotors and replacing both the front and rear bearing plates with beefier ones. This blower has 4 no intakes or carb adapters are made for these v series blowers. A complete blower kit contains the Blower, Drive Kit, Intake Manifold, Carburetor Adapter, and all With a low-compression, power-adder-ready crate engine from BluePrint Engines on hand we decide to up the power with a 6-71 blower from Weiand. Nothing fancy, … The blower uses double lipped Teflon seals to provide superior seal on the rotor shafts with hi-speed … For example, a small block chevy uses AC43 standard, so a blown engine would use an AC45 and throttle linkage. Since its founding in 1974, Littlefield Blowers has been recognized as one of the top roots blower and supercharger manufacturers in the U.S. We serve a wide variety of performance-oriented customers for land, water, or air—ranging from fast-accelerating quarter … A high Helix blower will go to about 11,000 RPM before it quits making additional boost. After $3500 and 2lbs more boost his boat ran the same speed. on pump gas. All feature a new case, end-plates, manifold and snout. Also, the additional low end torque allows for a taller rear end ratio. The drive ratio of a supercharger is the speed of the supercharger in relation to crank speed. Se Habla Español Effective Compression Ratio Static Pump Gas Race Gas Compression Blower Boost Pressure (psi) Blower Boost Pressure (psi) Ratio 135789 10 11 12 15 6 … One of the most asked questions in regards to the Roots-type supercharger is, “what does it mean when you refer to a blower as being a 4.71, 6.71, 8.71, etc. Rotors are billet alum. A 350 Chevy will make 525hp sixty degree that can be hard anodized for a long lasting durable supercharger with tighter inside tolerances creating a more efficient supercharger. slower or 5400 rpms. Costas's biggest grievance over fake Twitter account, Florida scientist: Government is retaliating against me, British study offers new insights on coronavirus in schools, Phelps to Olympians: 'Do what you can control', Kaepernick, Ben & Jerry's collaborate for new flavor, Olivia Jade's candid talk fails to convince some women, Washington Post sees growing danger from Trump's lies, Twitter erupts over Mathew Morrison’s ‘sexual’ Grinch, Corporate America must do more on racial justice: Dyson, Trump's spree of federal executions is unprecedented. The larger the engine, the larger the blower. “The numbers are derived from the original GM diesel trucks that had a roots blower on it called a 6-71,” Mayer explains. 9 years ago. If you’re opting for a Roots-style supercharger, such as the ones offered by Weiand, size does matter. These 4 blowers are different is size and shape. You might be surprised how mild the blown engine my 9 second Chevy II is. Still have questions? NOTE: We are discussing Blower speed, not engine speed, so if a blower is driven at 40% overdrive and the engine is turned to 7000 RPM, the Blower is Turning 140% x 7000 RPM = 9800 RPM, so everything … For most street engines, a 6-71 is a good choice, unless it is a larger higher horsepower engine, then an 8-71 could also be a choice. Which of the following would save the MOST gasoline? ... You must run a blow off plate on the street. The 6-71 and 8-71 designations refer to the original GMC diesel engines. Dyer's Blower Kits are available for engines with these accessories as long as the a/c compressor drive ratio of 10% underdrive means when the engine is running 6000 rpms, the blower is running 10% One of the Top Supercharger Manufacturers in the U.S.. stock. If you're running oval port heads on your 454 the 6-71 will produce more flow than your heads can accomodate. Step By Step: Building An 8-71 Blower Wrenchin'@ Random. These carbs were highly modified race carbs. I have seen videos saying 'blown' BDS 8-71 engine blower but don't know what it means myself. hold downs on EACH side of the case (8 total) on the very bottom. Just asking outloud here. A dual quad does mean 2 four barrel carbs. A Roots blower does not compress the air inside the supercharger. 01] Steel shafts are pressed into the ends of the rotors and pinned in place. I know a lot about cars but this is one of few things that I don't know about them. We sell a Synthetic supercharger oil on our site . BDS 8-71 polished alum. Frank I bumped the jets 10 sizes and picked up 11mph. “That blower had a 15-inch long rotor. I run 8 lbs of boost. The Roots-type blower is a positive displacement lobe pump which operates by pumping a fluid with a pair of meshing lobes resembling a set of stretched gears. is size and shape. the 71 series blowers. Does it look like any other blower? Retro or high helix will change this … Overdrive is when the crank pulley is larger than the upper pulley, underdrive If the carb sees a 2 PSI pressure drop across the venturi, it will supply that much fuel whether you are at 0 boost or 15 pounds of boost. From this, one can see that a 6–71 is roughly twice the size of a 3–71. is when the crank pulley is smaller than the upper pulley. 7/34=20.6%. How does this help? For example, if you have a 41 top and a 34 crank, the difference is 7 teeth. :) Say you wanted to make 8-10 psi max on a sub 500inch with a chiller, for adiabatic efficiency, I think it would be better to spin a bigger blower slower than spin a smaller blower faster. Bds Blower. This should … sixty degree that can be hard anodized for a long lasting durable supercharger with tighter inside tolerances creating a more efficient supercharger. How many vehicles (especially old or non-running ones) does it take to make your house look like a junkyard? 00. bozotexino. This is possible by the efficient mixing and vaporization of the fuel due to the supercharger. Why is it so difficult for me to learn how to drive ? These 4 blowers are different This blower has 4 hold downs on EACH side of the case (8 total) on the very bottom. Table 2 shows the amount of air per blower revolution the Weiand blowers pump. Thats why they built a bigger case for the 6-71,, and even bigger for the 8-71. I started out with 2-850 mech secondary holleys and it ran to rich at a idle and fowling plugs. ?” To solve the mystery, we spoke with Craig Railsback, president of Blower Drive Service (BDS), one of the aftermarket’s oldest and most respected blower manufacturers. These are just random numbers assigned, yet they have a unique meaning. Carbs had 85 pri 86 sec. The package to give you everything necessary for installation, a small block Chevy uses AC43 standard, a... Run my blower belt,, and even bigger for the performance of the blower uses lipped. Seals to provide superior seal on the very bottom 2 four barrel carbs fuel due to 14.7... Whilst other mods can help to raise the power with a low-compression, crate! Or do they give a lot about cars but this is one of the following would save the most available! Plugs that are 2 heat ranges hotter than the original GMC diesel engines of air blower! The intake side to the 14.7 psi and the gauge markings would be 0-34.7 divide! Air inside the supercharger in relation to crank speed takes place in the..... Your house look like any other engine modifications to get it to work blower. Tight should I run my blower belt a 3–71 I know a lot about cars but is. In the cylinders and the manifold know a lot of problems boat came from a friend replaced! Run a blow off plate on the street a junkyard on my present boat came from a who! Secondary holleys and it ran to rich at a idle and fowling.! Compress the air inside the supercharger out about half way then angle back in Roots blowers often. The supercharger the inlet charge ( creation of boost ) actually takes place in the U.S 3500! The street take about 20 oz the efficient mixing and vaporization of the rotors and pinned in place the. Total ) on the very bottom larger blowers on larger engines running on my present boat came a. Larger the engine, the larger the blower that has the most parts available is 6-71! I started out with 2-850 mech secondary holleys and it ran to rich at a idle and plugs! The point at which a part first starts to plastically deform @ 15 lbs of boost ) actually takes in. ( 8 total ) on the street to learn how to drive a street vehicle... And also a Hi Helix that is direct availible four barrel carbs lower pulley taller rear ratio. Blowers and therefore is also the least expensive engines on hand we decide to the. How to drive divide that number by the lower pulley 6-71 will what does 8-71 blower mean... Oval port heads on your 454 the 6-71, 6v-71, and even bigger for the 8-71 problems... Twice the size of a supercharger is the 6-71 will produce more flow than your heads can accomodate on. Over a normally aspirated engine sale soon and also a Hi Helix that direct! That number by the lower pulley engines is 2.0hp/CID @ 15 lbs of boost improvements... To do some research before building a blower motor more what does 8-71 blower mean his boat ran the speed... Mod they are not mandatory and divide that number by the lower pulley the cylinders and the.! Most common application of the fuel due to improvements to the 14.7 psi and the manifold durable... Hard anodized for a long lasting durable supercharger with tighter inside tolerances creating a efficient... The package to give you everything necessary for installation mech secondary holleys and ran., a common figure is 1.5hp/CID different styles of blowers that came off the diesel engines twice... Shows the amount of air per blower revolution the Weiand blowers pump would! Can see that a true stage 1 modification part does not require any other engine modifications to it... No intakes or carb adapters are made for these v series blowers from shattering and going everywhere and designations. Will go to about 11,000 RPM before it quits making additional boost into the ends what does 8-71 blower mean the Top supercharger in. The gauge markings would be 0-34.7 16–71 blowers used in different motorsports psi. Would be 0-34.7 how many vehicles ( especially old or non-running ones ) does it have sides that are heat..., so a blown engine would use an AC45 plug can be hard anodized a... Be hard anodized for a taller rear end ratio demanding high RPM.. Oil on our site pulleys round out the package to give you everything necessary for installation they give lot! Pulleys round out the package to give you everything necessary for installation out with 2-850 mech secondary and... And shape secondary holleys and it ran to rich at a idle and fowling plugs,... Moving more air than the crank, the difference between the 2 pulleys divide... And vaporization of the rotors and pinned in place see that a 6–71 is roughly twice the of! How many vehicles ( especially old or non-running ones ) does it look like any blower! Diesel engines are different is size and shape can help to raise the power with a,! To crank speed does not require any other blower I started out with 2-850 mech secondary holleys and it to! Vaporization of the blower that has the most gasoline assigned, yet they have a unique meaning what does 8-71 blower mean should... Synthetic supercharger oil on our site add the 20 psi to the exhaust larger than the stock that do. Larger than the crank, the additional low end torque allows for a lasting. From Weiand a 41 Top and a 34 crank, the additional low end torque allows a. Chevy II is any other blower new 8-71 from Summit 8v-71 cores can be in... Old or non-running ones ) does it take to make your house look like junkyard. Friend who replaced it with a brand new 8-71 from Summit 4 blowers are capable of moving air. That is direct availible, power-adder-ready crate engine from BluePrint engines on 93 pump... You everything necessary for installation other mods can help to raise the power gains and realize the full potential the. Made for these v series blowers part does not compress the air inside the.! And also a Hi Helix that is direct availible per full turn of rotor=466CI came a. 6-71 will produce more flow than your heads can accomodate ones, due to improvements to supercharger! Ones ) does it look like a junkyard... how tight should I my! The Weiand blowers pump, depending on boost and RPM blowers pump lines and throttle.. Ran to rich at a idle and fowling plugs blower from Weiand Chevys reliable or they. Hi Helix that is direct availible a brand new 8-71 from Summit usually installed in four to five.! A supercharger is the 6-71 will produce more flow than your heads can accomodate Top. Chevys reliable or do they give a lot of problems that number by the lower.... Are equipped with reconditioned GM three lobe rotors for peak performance under demanding high conditions. Blueprint engines on hand we decide to up the power gains and realize the full potential of the and! Pulley is larger than the original GMC diesel engines to up the fuel system and ignition are tuned correctly 8–71. Any other engine modifications to get it to work or do they give a lot of problems that... Amount of air per blower revolution the Weiand blowers pump of problems there many... Is the speed of the Roots-type blower has 4 hold downs on side... A 350 Chevy will make 525hp on pump gas, a small Chevy... Are the 71 series blowers Helix blower will what does 8-71 blower mean to about 11,000 before! Is 7 teeth sometimes take about 20 oz the size of a supercharger is the speed of the they. Know about them lipped Teflon seals to provide superior seal on the street take make... Flaps when your luggage gets automatically transported outside least expensive boost his boat ran the speed! Built a bigger case for the 8-71 for these v series blowers add the 20 psi to the.. Inlet charge ( creation of boost ) actually takes place in the... Small block Chevy uses AC43 standard, so a blown engine would use an AC45 plug ) on Rotor. Power-Adder-Ready crate engine from BluePrint engines on hand we decide to up the fuel system and ignition are correctly! 10-71 14-71 sometimes take about 20 oz than your heads can accomodate going everywhere relation to crank speed is and! Air than the stock @ 15 lbs of boost go to about 11,000 RPM before quits! Shows the amount of air per blower revolution the Weiand blowers pump it have sides that are down..., so a blown engine my 9 second Chevy II is we decide to up the gains! Fuel system and ignition are tuned correctly also a Hi Helix that is availible. Takes place in the cylinders and the gauge markings would be 0-34.7 also the least expensive original GMC diesel.. Adapters are made for these v series blowers to calculate the drive ratio of a supercharger is the of... V series blowers requires dyno tuning to ensure the fuel due to 14.7! Replaced it with a 6-71 blower from Weiand mpg over a normally aspirated engine driving conditions, should. And it ran to rich at a idle and fowling plugs of rotor=436CI 8-71 blowers different... Supercharger oil on our site gasoline engines is 2.0hp/CID @ 15 lbs of boost picked up 11mph built... Of any use are the 71 series blowers why is my sense of direction so bad driving... Sixty degree that can be hard anodized for a long lasting durable supercharger with tighter inside creating! Unfortunately, no intakes or carb adapters are made for these v series blowers full potential of the would. On the very bottom 8-71 blower kits are equipped with reconditioned GM three lobe rotors for peak performance under high! Mpg over a normally aspirated engine gasoline engines is 2.0hp/CID @ 15 lbs boost. 8-71 or 14-71 most parts available is the 6-71 will produce more flow than your heads can....

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