blowers/ turbo's

Old 02-08-2009, 02:00 PM
  #1  
poncholvr
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Default blowers/ turbo's

hey whats your compression with and with out your boost??
anyone done any readings like that?, before ,and after boost is applied?
-8:1 b4- 12 after??
curious is why i ask
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Old 02-09-2009, 10:29 AM
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dak697
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((boost psi / 14.7) + 1) x motor compression = effective compression

this is the compression ratio including boost of a turbo/blower motor compared to a naturally aspirated (sp) motor
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Old 02-09-2009, 05:49 PM
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kwkracing
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well if this calculator is right, my street car has 8 to1 before and 13.6 after 10 lbs and my dragster has 12.5 before and 25.5 after 15lbs?
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Old 02-09-2009, 09:12 PM
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dak697
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pretty much

13.44

25.25
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Old 02-09-2009, 09:42 PM
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zipper06
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AAAAHH!!,
I don't know about that? 358" SM/BLK 10.5 to 1, 1471 20% O.D. 30lbs boost, sounds to me like that should blow the crank out the bottom and the heads off the block, but it don't, and i know there's a couple other guys on here besides myself that run atleast that much boost with SM/BLKs sucessfully on alcohol.

JMO

Zip.
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Old 02-10-2009, 07:26 AM
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feenst
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Using this I get pretty much the same numbers: http://www.wallaceracing.com/boost-c...ratio-calc.php
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Old 02-10-2009, 09:36 AM
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kwkracing
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zipper, your running 32 to 1 in a old sbc!!!! Lol!!!! Maybe we should weld our heads to the block!!! I AGREE. This formula can not be right, as the rpms increase you can not go by static compression to find actual compression at any gaven rpm.
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