blowers/ turbo's

Old 02-08-2009, 03:00 PM
  #1  
poncholvr
Senior Member
MASTER BUILDER
Thread Starter
 
Join Date: Jan 2008
Posts: 146
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
poncholvr is offline  
Old 02-09-2009, 11:29 AM
  #2  
dak697
Senior Member
MASTER BUILDER
 
Join Date: Mar 2003
Posts: 127
Default

((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
dak697 is offline  
Old 02-09-2009, 06:49 PM
  #3  
kwkracing
Senior Member
RACING JUNKIE
 
Join Date: Dec 2004
Location: austin texas
Posts: 729
Default

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?
kwkracing is offline  
Old 02-09-2009, 10:12 PM
  #4  
dak697
Senior Member
MASTER BUILDER
 
Join Date: Mar 2003
Posts: 127
Default

pretty much

13.44

25.25
dak697 is offline  
Old 02-09-2009, 10:42 PM
  #5  
zipper06
Senior Member
RACING JUNKIE
 
Join Date: Jan 2006
Location: La.
Posts: 2,890
Default

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.
zipper06 is offline  
Old 02-10-2009, 08:26 AM
  #6  
feenst
Junior Member
JOURNEYMAN
 
Join Date: Oct 2004
Posts: 29
Default

Using this I get pretty much the same numbers: http://www.wallaceracing.com/boost-c...ratio-calc.php
feenst is offline  
Old 02-10-2009, 10:36 AM
  #7  
kwkracing
Senior Member
RACING JUNKIE
 
Join Date: Dec 2004
Location: austin texas
Posts: 729
Default

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.
kwkracing is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service