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pressurized compression ratio

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 Post subject: pressurized compression ratio
PostPosted: Sun Oct 03, 2004 9:51 am 
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Joined: Sat Oct 04, 2003 8:28 am
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Location: West Coast- silverton,OR & Sacramento,CA
ok, i got a question for you techies. my MC1 has a static compression ratio of 7.8:1 correct? ok, so is there a way to calculate what the compression ratio is under say, 15psi? i'm just curious to see what the compression ratio of a motor under 20+psi compared to the static compression ratio of a diesel engine is, like 21.1:1, then sometimes possibly turboing the diesel engines would increase that too.


the main reason i'm thinking about this is to sort of determine the strength of the iron inline engines. if we've got guys here making 400hp on less boosted compression than the diesels have static, then we know we've got a pretty stinkin' beefy bottom end. that and i'm just curious to see what the compression ratio goes to under boosted situations.

:-)

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PostPosted: Sun Oct 03, 2004 10:26 am 
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Joined: Tue Jun 29, 2004 9:05 am
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Location: MSP
Most new diesels are running about 18:1 with 18psi of boost stock... TDI runs 19.5:1... My old school Diesel (95 chevy 6.5 TD) is 21:1 with 12-14psi of intercooled boost...



Check out http://www.rbracing-rsr.com/compression.htm


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PostPosted: Sun Oct 03, 2004 2:02 pm 
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Absolutely.

Derr here is a good source for some pertinent number crunchers.
www.rbracing-rsr.com


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PostPosted: Sun Oct 03, 2004 5:58 pm 
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cool! thanks guys :-)

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83' URQ~project secrecy
85' 4kq 20vt~The Sniper 8) *alive*
01' A6 4.2~6spd conversion, Gallardo 19's*sold*
83' 4ks 2dr*DD protege'*
85' diamond 4kq*DD*


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