compression ratio - Chevy Impala SS Forum
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post #1 of 20 (permalink) Old 11-27-2005, 06:10 PM
marion
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is 11:4:1 to high a compression ratio for a stroker?
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post #2 of 20 (permalink) Old 11-30-2005, 08:35 AM
KWBaraka
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Quote:
Originally posted by murphies_finest:
is 11:4:1 to high a compression ratio for a stroker? will eventualy be adding a twin turbo set up?
No way would I run 11.4:1 CR with a turbo.....but that's just me [img]graemlins/1.gif[/img] .

That CR is not too high for a stroker......you are talking about a LT1/LT4 engine [img]graemlins/3.gif[/img] ......correct [img]graemlins/6.gif[/img] ?

I run 11:1 CR with no issues. I know of several others with quite a bit more CR.

With proper tuning....you'd be fine!

I'd repost your question about the turbo on the Forced Induction page where some of the turbo gurus would see it.

Good luck!!!!!!

KW
post #3 of 20 (permalink) Old 11-30-2005, 09:02 AM
mass9c1
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KW I think he's talking about a GEN 1 SBC, L03/L05.
 
post #4 of 20 (permalink) Old 11-30-2005, 10:49 AM
KWBaraka
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Quote:
Originally posted by mass9c1:
KW I think he's talking about a GEN 1 SBC, L03/L05.
If that's the case....then 11.4:1 CR is definately in the category of a 'specialty' engine [img]graemlins/.gif[/img] !

KW
post #5 of 20 (permalink) Old 11-30-2005, 12:00 PM
mass9c1
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KW why is that?

The L03/L05 can't handle that much compression, any specifics??
post #6 of 20 (permalink) Old 11-30-2005, 12:13 PM
Bugman
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The reverse flow cooling in the LT1/LT4 engines allows it to get away with higher compression than a gen 1 SBC. On a LO3/LO5, I would go 10.5:1 with AL heads, or 10:1 with iron heads max, and either will require premium gas. Of course how much static compression you can get away with depends on lots of things, expecially the cam. Generally though, 11.4:1 will reguire higer octane racing fuel.

For a turbo motor, I would run about 8.5:1, but performance will suck terrably until you get the turbo on it.
post #7 of 20 (permalink) Old 11-30-2005, 01:24 PM
KWBaraka
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Quote:
Originally posted by Bugman:
The reverse flow cooling in the LT1/LT4 engines allows it to get away with higher compression than a gen 1 SBC..........On a LO3/LO5, I would go 10.5:1 with AL heads, or 10:1 with iron heads max.........Generally though, 11.4:1 will reguire higer octane racing fuel......
^^^^^^^What 'Bug' said^^^^^^^

KW
post #8 of 20 (permalink) Old 11-30-2005, 01:30 PM
Ram Air 383
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Quote:
Originally posted by murphies_finest:
is 11:4:1 to high a compression ratio for a stroker? will eventualy be adding a twin turbo set up?
11.4:1 cr is way too high for a power adder unless you plan on running race gas.

As far as n/a performance goes, you missed a very important variable, the cam. The compression ratio would be too high if you plan to run a small (227/845 cam) in a stroker. It would be too low if the cam has a 250+ duration @ 0.050" lift. This assumes you are using aluminum heads and the quench height is not too big.

You need to provide more information.
post #9 of 20 (permalink) Old 11-30-2005, 01:38 PM
Ram Air 383
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Quote:
Originally posted by mass9c1:
The L03/L05 can't handle that much compression, any specifics??
Reverse cooling is one reason why an LTx engine can have higher compression ratios than a regular SBC. A more efficient combustion chamber is the other. Just look at LSx engines. Their compression ratios uproach LTx ratios without reverse cooling.

The maximum streetable dynamic compression ratio is a matter of head material (iron/aluminum), combustion chamber, quench height, gasket bore, rod length, cam specs, piston shape, valve shrouding, etc and tuning.
post #10 of 20 (permalink) Old 11-30-2005, 03:26 PM
marion
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the block is gonna be a motown lite with e tec 200 heads and the edelbroc MPFI set up comp cams recomended to me 8-306-8 not building until next year after iraq and my tuning will be done by wild jim at ccstuning in san antonio all forged internals H beam rods with flattop pistons yeah I notice my turbo question is out of place gone see if i can edit my original post
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