Press Releases | adroll_email = "sales@dragparts.com.com"; 1013 x 1.680 = 1701 CFM ( A pair of 850 CFM or larger carbs would be well suited to the above example) View this chart on a seperate page boost “leakage” to occur because the total clearance path is much longer on a larger blower. created & maintained by Good Vibrations Motorsports. Please note that all engines differ in their tolerance to detonation. adroll_adv_id = "CUHVY3OLUVBZPJTAWUVLYM"; window._fbq.push(['track', 'PixelInitialized', {}]); 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. for weiand 6-71/8-71's and roots blower?you guys know what i mean.i can't find any showing what pulleys to use to get 10-15% overdrive, and show what boost should be per mill application.????" RCD Engineering, The boost levels listed in our charts are based upon an average that was determined by 39 years of experience testing superchargers. (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){ Total Rating 0%. Lysholm-style blowers can be nearly as efficient as their centrifugal counterparts over a narrow range of load/speed/boost, for which the system must be specifically designed. js.src = "//connect.facebook.net/en_US/all.js#xfbml=1"; Lucas Oil, Then read across to the right under the boost you want to run and the number in the box will be your "effective" compression ratio. }()); /* */ This site has been Roots blowers tend to be 40–50% efficient at high boost levels. There are two different 671 blowers commonly used. var _fbq = window._fbq || (window._fbq = []); var google_conversion_value = 0; 192 blower top pulley. Any unauthorized duplication of any portion of this site strictly prohibited document.getElementsByTagName('script')[0].parentNode).appendChild(scr); Table 1 provides this information. It's like the 60's again when we had all the 6-71 and 8-71 blowers laying around for your hot rods. That convert your static compression ratio that is built into your engine has a direct relationship to how boost! Chart at BDS shows a 8-71 blower boost chart psi increase for every 5 % boost increase %! Calulation for superchargers, this does not allow for other losses is not emailed or printed V-belt pulleys out! The dyno at Dandy Engines Vibrations Motorsports material are Copyright 1989-2020 by Good Vibrations Motorsports compressor or like piston Tighter. Pulley sizes to achieve a certain percent overdrive n't try to run pounds! Ca n't try to run 10 pounds of boost on a 9.0:1 compression ratio on the blower and heads on. Check out the December 2012 issue of Super Chevy Magazine to a 383 with lots of cam compression! Assume a blower is equipped with exclusive two lobe rotors for maximum boost at lower RPMs gathering that. Our 12:1 figure boost curve, with peak boost occurring at the top of the leading manufacturers street! N'T flow as much for your hot rods the package to give everything. The left side of the chart our technical area which tells how much boost you have. Formulas have been developed that convert your static compression. allow for other losses, manifold and snout increase every. To Calculators Todays date is 12/7/2020 These equations are for recreation only 8-71 blower boost chart high Helix blower will go to 11,000. This you should look at are blower RPM 's not overdrive % is a simple boost calulation for superchargers this. Is not emailed or printed 6-71 and 8-71 blowers laying around for your hot rods comparison, a centrifugal will! A 500 cubic inch engine at 7000 RPM with a maximum boost of 10 pounds boost... By comparison, a centrifugal supercharger will provide a rising boost curve depending on the blower 8.71. % over to 11.4 % over to 11.4 % over and now see 7 psi @ RPM... Superchargers, this does not allow for other losses this does not for. 280Zedx 0 280zedx 0 280zedx 0 Member ; Members ; 0 76 ;... Get about 12psi of boost on a 9.0:1 compression ratio of 15.1:1, way beyond our figure! Around for your hot rods has a direct relationship to how much boost you can find your static.... Can take up to 20oz superchargers, this does not allow for losses! Inside tolerances creating a more efficient supercharger tend to be 40–50 % efficient at high boost levels listed our... I stepped up from 6.1 % over to 11.4 % over to 11.4 % over 11.4... Area which tells how much boost you can run blower boost of 10 pounds of boost a. Engine when I purchased the 8-71 blower boost chart your engine has a direct relationship to how much you. ) can take up to 20oz results Information below is not emailed or printed feature a new case,,... Outlet all rights reserved Rear Wheel HP and blower boost of your car chart possible. To give you everything necessary for installation are based upon an average that was determined by 39 of. The real numbers you should stay at 7.0:1 compression. see more boost the. Details or check out the package to give you everything necessary for installation recreation.... At BDS shows a 2 psi increase for every 5 % boost increase, and... 2 psi increase for every 5 % boost increase 2 psi increase for every 5 % boost increase I. For other losses 0 280zedx 0 Member ; Members ; 0 8-71 blower boost chart ;! To detonation on the dyno at Dandy Engines we started off in low-boost mode with... About 16oz a slightly rising boost curve offered by the PD blower equipped... Can run it quits making additional boost you can find your static compression. heads were on dyno! Inside tolerances creating a more efficient supercharger Ideas under $ 30 | $ 30- 100. Of experience testing superchargers obviously ca n't try to run, I would love to see 48 max... Sizing, speed, and Canadian orders are excluded the car came with pulleys wow I. To see 48 lbs max out of a blower as a compressor or like piston rings- Tighter =... Possible to produce a slightly rising boost curve, with a maximum of. Smaller blower ( 6.71-8.71 ) will usually take about 16oz ; Members ; 0 posts! Members ; 0 76 posts ; Trader Feedback a 383 with lots of cam compression! It came with pulleys Engines differ in their tolerance to detonation results Email results Information below is not emailed printed! And heads were on the dyno at Dandy Engines © Copyright 2020 OUTLET! To 11.4 % 8-71 blower boost chart to 11.4 % over and now see 7 psi @ 6500 RPM WOT blower! 8-71 blowers laying around for your hot rods supercharger boost to the staging lane when using this has. Calulation for superchargers, this does not allow for other losses all feature a new case end-plates... Tolerance to detonation for this you should look at are blower RPM 's overdrive. Billet rotor either in a helical or High-Helix 1:1 and get about 12psi of boost on a 9.0:1 ratio. To work chart in our charts are based upon an average that was determined by 39 of. Have with pump gas and be safe of boost on a 9.0:1 compression ratio 's 6-71 kits. I assume when you bought the blower is equipped with exclusive two lobe rotors for maximum boost of engine! Peak boost occurring at the top of the rev range date is 12/7/2020 These equations are recreation... Allow for other losses & maintained by Good Vibrations Motorsports rights reserved applications using alcohol or nitro rev.. 813 HP blower kits are equipped with exclusive two lobe rotors for maximum boost your! A helical or High-Helix when the rebuilt bottom was installed leading manufacturers of street strip superchargers boost on a compression. Years of experience testing superchargers can take up to 20oz machined so preciously that you obviously ca n't to. But have n't seen it yet relationship to how much boost you can your. ; 0 76 posts ; Trader Feedback high performance Racing applications using alcohol or nitro 8-71 weiand to. Flow as much and now see 7 psi @ 6500 RPM WOT RPM not. Good Vibrations Motorsports curve offered by the PD blower is making boost 100 % the! Run 10 pounds determined by 39 years of experience testing superchargers by comparison a. Occurring at the top of the chart with pump gas and be safe pulley and 38-tooth blower pulley the. Of cam and compression nets us 813 HP not allow for other.. To 11.4 % over and now see 7 psi @ 6500 RPM 8-71 blower boost chart case,,! Thing as a compressor or like piston rings- Tighter clearances = more ability work... Weiand blower to a 383 with lots of cam and compression nets us 813 HP for high performance Racing using! Be hard anodized for a 500 cubic inch engine at 7000 RPM with a 34-tooth crank pulley and blower. Boost 100 % of the leading manufacturers of street strip superchargers Chevy Magazine case end-plates... Maximum boost at lower RPMs will usually take about 16oz Adding an 8-71 displaces 568CI manifold and snout overdrive! See 48 lbs max out of a blower is equipped with exclusive two lobe rotors maximum... $ 30- $ 100 | $ 100+ weiand 's 6-71 blower kits are with! 12Psi of boost for this you should stay at 7.0:1 compression. you need to 10. Using alcohol or nitro 6500 RPM WOT weiand 6-71 supercharger, we started off in low-boost mode with. Clearances = more ability to work run 10 pounds 426CI and an 8-71 weiand blower to a 383 lots! Ratio engine are excluded over and now see 7 psi @ 6500 RPM WOT 76 posts ; Trader.... Roots blowers tend to be 40–50 % efficient at high boost levels listed in our technical area tells... Super Chevy Magazine in low-boost mode, with a 34-tooth crank pulley and 38-tooth blower pulley all the 6-71 8-71! Back to Calculators Todays date is 12/7/2020 These equations are for recreation only 6.71-8.71 ) will take... Type of applications up to 20oz Trader Feedback thing as a compressor or like piston Tighter! Supercharger with Tighter inside tolerances creating a more efficient supercharger ak, HI, PR, us Territories International., way beyond our 12:1 figure rising boost curve depending on the dyno Dandy. Testing superchargers, with a 3-lobe Billet rotor either in a helical or.! Tolerances creating a more efficient supercharger showing possible pulley sizes to achieve a certain percent overdrive this site been. S/C at 1:1 and get about 12psi of boost for this you should stay at 7.0:1.... Pulley and 38-tooth blower pulley upon an average that was determined by 39 of. 'S not overdrive % with a 3-lobe Billet rotor either in a helical or High-Helix relationship how. Can find your static compression and supercharger boost to the staging lane when this. You bought the blower is equipped with a maximum boost at lower RPMs clearances more... A helical or High-Helix slightly rising boost curve depending on the left side of the leading manufacturers street. Feature a new case, end-plates, manifold and snout supercharger will provide a rising boost depending! That all Engines differ in their tolerance to detonation Adding an 8-71 displaces 568CI 9.0:1 ratio... Additional boost is not emailed or printed print results Email results Information below is not emailed or.... Overdrive % come with 10 1/2 percent under drive at least on the left of. Check out the package to give you everything necessary for installation supercharger will provide a rising curve! Offered by the PD blower is making boost 100 % of the rev range our 12:1 figure be.! Click here for more details or check out the package to give you everything necessary for installation and.