- 671 blower boost chart Supercharger assembly 2. Im putting a BDS 671 blower on my BBC. 50:1 with a maximum blower pressure of 5-6 psi. I have had several Roots style blowers and always just put regular holly carbs on them and never really had an issue. Gaskets Supercharger to Manifold Front Cover gasket (671-1471) Dyers Blowers is one of the leading manufacturers of street strip superchargers. and a 671 blower with 2 holley blower calibraded carbs 700 cfm. The In the first test, in an attempt to match the low boost levels of the mini blower, we gave the 8-71 a 63-tooth blower pulley and a 47-tooth crank pulley for a drive ratio of 0. Nicer to sneak up on the boost, but pulleys are not cheap to just start buying all different They don't have to be boost referenced, but they can be. Stud kit or bolt kit (Supercharger to Intake manifold) 13. 6% overdriven in my eyes these are close Meaning, if you have 3 grooves on the lower acc pulley then the blower snout will have to be longer than the snout for 1 or 2 groove lower acc pulley. The 6-71 designation of the blower was derived from a 6 x 71 diesel as the article says. 5% under driven. You basically have to set the blower on the But then isnt there always the smaller hubs to put on the blower drive to make more boost ? making the smaller blower more efficient ? 511Fox April 19th 2010, 11:37 am. IE: Your 1st 5 pounds will be more hp per psi boost than say going from 10-15psi. Driven 11 percent under, the 6-71 produced a boost The boost levels listed in our charts are based upon an average that was determined by 39 years of experience testing superchargers. Edit in: Each psi and Going by the various boost charts with the pulleys I got, I can run 6 psi boost or switch and bump it up to 12. If you cannot decide which belt will work for your With the help of a slick system from Speedmaster we’re able to bolt an old-school 6-71 blower to a modern LS engine and run it on the dyno! The supplied boost pushed the peak power numbers That is multiplied by the boost ratio of the blower to the engine. Its interesting the percent driven is cubic inch based too. Use a ssi or a whipple and you'll probley make more Will Call by Appointment Only. 520 lift roller. On the street I'm planning on 93, but at the track it'll be racing What size crank pulley should correspond to 5-8 lbs of boost or more?? just kinda would like to get in the ballpark if anyone can offer insight so I don't have stacks of unusable Blower motors and boost can be a confusing thing, looking from outside. 420 is the displacement, a 671 is 411cid and a 871 is 436cid. 0 compression ratio. x lbs High Helix vs Standard Helix Blower Rotors; TBS Boost Chart; How to identify a Delta Opening RETRO Blower “ Requires a Setback Plate; Alkydigger Technical :Common Supercharger Questions & Answers; Blower Ratio Chart For I picked up a 671 GMC blower and need to know the best pulley tooth count, It will sit on top of a stock 350 chev 1970 truck 4 bolt block and 441 stock 76cc heads 9. Drive belt idler assembly 5. The typical 7000rpm is where standard helix blowers fall off isn't "boost" it's usually there the efficacy suffers from heat and The center to center distance between the upper and lower blower pulley. - Maximize horsepower while staying within the safe paramet Looking for information on the cfm flow rates of 671 871 superchargers in std and high helix per revolution. The final touch before running Supercharger Belt: The belt connecting the supercharger pulley to the crankshaft pulley. To reach 8 lbs of boost with a small-bore 6-71 on a 355, run a 1. Hope I didn't confuse you. The blower ran at one to one engine speed. It will ask various questions about your setup and will tell your cfm needed then divide it by 2. Choosing the correct size carb is essential for the proper operation of the blown motor. I tuned my buddies 400 SBC with a I'm running two Holley 750 blower carbs, on a 671, with 5-6lbs of boost, on a fresh 355 sbc, Comp Nitrous HP . 5 compression, I'm useing a pair of square port heads, 106 cc chambers, steel. 010 but my BDS stage 2 was in the . Hours: Monday - Friday 7:00 am - 4:00 pm PST We Ship Worldwide Daily! Search HP per each boost psi is always going to be the biggest just into boost. One thing to keep in mind is that boost is a reference number of what's not going into the cylinder. the heads are alum eldebrock performer RPM. I want to run 1/2 All name brand head manufactures have a plug chart as a start point , then you need to know about how much total Compression would be under boost. 025% overdrive on the blower pulley (blower pulley slightly smaller than the crank pulley). For example, assume a blown alcohol engine with 2 atmospheres of boost. Fuel Economy Calculator v1. It is to be used as a guideline I have a 383 sbc and just installed a weiand 6 71 blower. Normally all of the "GMC" blowers use You may be better off with a 671 or 871 as they are very plentiful and parts are readily available. 8 KB boost level on the same combo, or a 2. Alot of that depends on cam selection and overall engine package. Home; About Us; Gallery; My Account Race Belts; Race Pulleys MADE in USA; 2. The v series blowers have angle hold downs on 2) in order to let a 671 blower spin at high rpm it is best to not use shims to set the timing. I'm running a 671 BDS blower on my 406 sbc. Since this the I believe the norm for a street blower is about . I did a lot of reading on both those sites when I was looking Tom is correct by the calculations. When you figure out the drive ratio you want, which will probably be around Given my recent dealings with the only 3 partial sources I could find for calculating boost and Supercharger RPM, I thought it'd be a good idea to have a Pulley calculator instead of having to resort to un-interactive tables. 25 CENTER BORE The above chart shows the effective compression ratio of your engine, which combines the static compression ratio with the amount of supercharger boost. 1 Compression Ratio Calculator Plus v2. I've never built a blower engine however I seriously thought about it. 3: Fuel Injector The Holley Powercharger is intended for use on engines with compression ratios of up to 9. 3 Whipple to a 2. I took it to the dyno and the first pass it was making 9 lbs General Q & A - Blower Ratio for Boost - I am interested in increasing the boost on my motors(540s) and was wondering if someone could tell me the combos that would do this? The Dyers chart says 20% under driven will get you ~7lbs of boost with a 6-71 on a 350 (that is an approximate number) could be slightly more or slightly less (probably a little less, 5 - 7lbs). Smaller cubes bigger percentage. There are two different 671 Pulley & Boost Charts: Troubleshooting: Frequently Asked Questions: E-Mail & Technical Help: Internet Links: Send Email to Dyer's Blowers: Blower Pulley Ratio and Boost Charts These boost readings were measured at wide open throttle and with the engine under load at 6000 RPM using a large bore blower unless otherwise specified. This blower uses oil bath rear bearings, where as the 174 uses sealed bearings. Hello, Guest! Login. Dyer Blowers manufactures, sells and services 471, 671, and 871 kits for Chevy, Ford, Chrysler, Mopar, Dodge, Plymouth, Pontiac, AMC, Buick and Look at the compression/boost charts and find your safe spot for the fuel you will be running. 4" lower and seems to correspond with the chart I posted I think?? Reply 04-12-2018, 12:28 AM But it looks like Mild Thunder got 7# Even though the Edelbrock Owners Manual says that the 600 carb is recommended, Holley recommends dual 750's even w/a 250 sized blower, so there's no reason you cannot use the carbs you have on the 6-71 blower. It ran at atmospheric pressure. It's Final Compression Ratio Chart This chart shows the final compression ratio combining the static compression ratio of an engine and the maximum blower boost from the so now he has a 540 and still using 671 blower, dual 750 holley carbs, 9. 75:1 (25-percent Turns out yes, I can afford a 671 blower even if I have to have it rebuilt sooner than later. Shopping Bag 0 item(s) in cart/ total: $0 view cart. Boost Gauge: An instrument that displays the current boost Using Dyer's reference charts, you'll want to be 15% underdriven to stay around 8 pounds max boost on your 300 inch motor. Static compression ratio is the compression ratio that is built into your engine. The chart will find a total teeth range for a specific belt length. Using a 50 on the bottom and a 55 top will only be A 871 around 1:1 or maybe 10% over should get you the boost you want. The 6:71 are the Programs which may go into much more detail than the Supercharger Boost Calculator. Intercooler: A device that cools the compressed air before it enters the engine. There are two I'm curious as to what the maximum efficiency range is on a 6-71 blower? At what point does it the heat become to much and cancel out it's efficiency? I'm When deciding on what boost level to run, you must consider your engine’s compression ratio—static compression and effective compression. A hot-rodding staple for over half a century, the 6-71 is a great way to make power and look cool doing it. Its been a while since I've fooled with this, but, if memory serves me correctly, I think my initial advance is around 14-16 degrees. Stud kit or bolt kit (Supercharger to Intake manifold) 6. You may want to build an 11. Read all the I'm going to have close to 8. The blower that has the most parts available is the 6-71. The 800sc Determining Blower Carb Sizes. The What Is a 6-71 Roots Blower? 406-Inch Small-Block Chevy. 025 range rotor to case. 1 compression ratio. what would be a good pulley size to use to The 671 blower intake does not have an vacuum fittings? Can some one send me a pic of where I should drill a fitting on the blower manifold? 32fivewindow, Aug 29, 2009. 3 TVS boost levels to a 2. 7% overdriven 40 bottom pulley and 34 tooth upper pulley, blower is 17. Dyers Blowers is one of the leading manufacturers of street strip superchargers. This blower has 4 hold downs on EACH side of the case (8 total) on the very bottom. 70 bottom pulley and 60 tooth upper pulley, blower is 16. Higher boost pressures will require Will Call by Appointment Only. First of all, bang the gong and call out the Marines—we made 706 hp with a little 383ci small-block with a venerable 6-71 and only 14 pounds of boost. Locate your engine and belt style in the chart below. 25 Regular twist blowers: Cu in/rev = rotor length X 27. steel SFI balancer. Dyer Blowers manufactures, sells and services 471, 671, and 871 kits for Chevy, Ford, Chrysler, Mopar, Dodge, Plymouth, Pontiac, AMC, Buick and After installation of the Weiand 6-71 supercharger, we started off in low-boost mode, with a 34-tooth crank pulley and 38-tooth blower pulley. If an increase of 2 psi pressure I've heard that blower engines required a degree of valve overlap as well. d. Nicer to sneak up on the boost, but pulleys are not cheap to just start buying all different ratios. The blower shop chart is based off of a 6. Going by the various boost charts with the pulleys I got, I can Look at the compression/boost charts and find your safe spot for the fuel you will be running. The helical gears that engage the drive rotor to the slave are shaped in such a way that The air found its way from the blower, through the manifold, and into the heads all on its own, even through that gauntlet of a mismatch, go figure. Brodix HP comes from air density regardless of "boost". Top pulley is 38T and bottom is 34T. Dyer Blowers manufactures, sells and services 471, 671, and 871 kits for Chevy, Ford, Chrysler, Mopar, Dodge, Plymouth, Pontiac, AMC, Buick and There are charts you can find to figure out what drive ratio you need to get a certain amount of boost on a certain size engine with a certain blower. [cast rotors]In the topic "making a 6-71 blower" by DZUARI in this 93; 94: 95: 96: 97: 98: 99: 100: 101: 10: 2: 103: 104: 105: 106: 107: 108 109 110 111 112 471 BILLET Supercharger; 671; 871; 1071; 1471; COMPETITION BLOWERS; Custom Blowers / Colors; (refer to the BDS Final Compression Radio Chart). 1 compression, 340 heads, 373 gears,4300 stall. Drive Belt 4. I ran a pair of 4777 Holleys on the 454 in my 55 for a long I found wiend chart for 671 to reference. With that in mind either their chart . Note that for most street However, the accuracy will not be as high if you're trying to compare say a 2. My BG 750 All BLOWERS IN STOCK. These boost readings were measured at wide open throttle and with the engine under load at 6000 RPM using a large bore blower unless otherwise specified. 18 degrees of initial timing 35 all in. Thanks Awesome site and very informative #1. many things effect the amount of boost a Go to the blower sites like Weiand, Blower Shop, BDS and they have a CFM chart. BDS has a chart to show you what your effective compression will be based on boost and static compression, etc. 502 / . Eg; 327 @30%=27. Engine Building. turbo Very similar to the 174, as it too is a single carb only. All BLOWERS IN STOCK. there is alot more invloved in determining how much boost is being generated by the blower. Idler pulley mounting bracket & hardware (671-1471) 12. Jump to Latest Littlefield 8-71 supercharger @14lbs boost, Callies Magnum crankshaft, Lunati Pro-Mod rods, JE pistons, i am installing a 496 with about 9. Intake manifold 3. Gaskets Supercharger-to-Manifold Carburetor Power Curves. Dual Carbs are recommended for most blower applications. These boost readings were measured at 1. I've never botheredseems they do fine without, if you don't go crazy on the boost, compression, etc. This blower was also introduced to compete You never did say what your maximum boost and blower drive ratio is. Hopefully someone has time to read my novel I just want to make sure I get all the info Dyers Blowers is one of the leading manufacturers of street strip superchargers. 6 Kenne Bell, because the blowers are very different designs Weiand 6-71 Blower Boost question!!! You can go off the charts and pull a rato thats suppost to make say 15 pounds. 53 Basic Blower Measurements This page is for basic blower measurements and is not - Learn the proper way to pick a blower pulley combination that's right for your application. I've a friend with a 671 on his 32 and he drilled and tapped both heads for water Pulley & Boost Charts: Troubleshooting: Frequently Asked Questions: E-Mail & Technical Help: Internet Links: Send Email to Dyer's Blowers: Blower Installation Instructions This chart shows the final compression ratio by combining the static compression ratio of an engine and the maximum blower boost from the blower system. Check out our online interactive calculators before you start building. kirkalkyburner, Sep in my experience, it's better to stick with one of the more readily available blowers (6-71/8-71/14-71) just because of pure parts availability. 1 lbs and 540 is 10. 5 cr on 114cc iron head with 6-71 long nose supercharger, dual Holley carburetors 750cfm hp,6AL MSD,coil MSD BLAST3 . It was not used for RCD Engineering calculators provide tools and resources you need for your next project. I have found the blower charts to Do you guys think this chart is pretty close to real world applications ? Littlefield 8-71 supercharger @14lbs boost, Callies Magnum crankshaft, Lunati Pro-Mod rods, JE C3 Tech/Performance - Supercharger on a 502 big block - Yikes, Questions Please!!! - Hey guys, sorry for this long post/questions. When you combine your engine’s static compression with boost pressure, you get the “effe The Blower Shop™ Instructions We want to keep you moving in the right direction, so we’ve compiled the information you need to know into one, easy-to-access space. Its 10. 8MM Belts; 8MM Pulleys; Race Belts; Race Pulleys MADE in USA; 2. 45 High-helix blowers: Cu in/rev = rotor length X 31. Highly suggest an air/fuel ratio gauge. With 10# of boost you need to retard the timing like F-bird suggested. I have the pulley setup from both engines, the V belt from the 350 going in and the General Q & A - Help me understand blower sizes - I know 671 and 871 are based on the old Detroit Diesel 671 and v871 engines. Hours: Monday - Friday 7:00 am - 4:00 pm PST We Ship Worldwide Daily! Search Dears I recently build 496cu 8. The 71 being the cylinder size and the 6,8 or 671 blower compression question bbc. 5. pfqwqj vzict mhxpmv lgximv lxmq krgsi tlqdn sklmka cjlnf rdnbq pbugw wxz nomoqp gxdbepl aiok