Dynamic compression ratio to great
09-26-2002, 11:00 PM
#1
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Car: 82 Z28
Engine: Al LT1 headed LG4 305
Transmission: TH350
Axle/Gears: 3.73 posi with spacer
Dynamic compression ratio to great
I was thinking of getting some Dart Iron Eagle 200's with 64cc chambers and using a XE268 on my 0.04 over 350. I have four valve reliefs per piston. Will the dynamic cranking compression ratio for this setup be too great for pump gas on the street. Is this cam the best choice? What would be a better cam?
09-27-2002, 04:28 AM
#2
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what pistons? flat tops or dished? at any rate i'd guess you'd be fine but there is a lot of varances even with the same compression ratios depending on piston design among other things.
09-27-2002, 04:37 AM
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Car: '94 Corvette
Engine: LT1
Transmission: 4L60E
With 4 reliefs I would assume flattops...I would guess 9.5-10.0:1
I've seen production Vette's with 10.8:1, but you'll need the good stuff.
My '94 is about 10.5:1, and requires (well tells you) to run premium.
Ron
I've seen production Vette's with 10.8:1, but you'll need the good stuff.
My '94 is about 10.5:1, and requires (well tells you) to run premium.
Ron
09-27-2002, 01:03 PM
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Car: 82 Z28
Engine: Al LT1 headed LG4 305
Transmission: TH350
Axle/Gears: 3.73 posi with spacer
Yes they are flat-tops with 4 valve reliefs. What is the average piston in the hole distance?
Thanks
Thanks
09-27-2002, 01:31 PM
#5
Supreme Member
Piston to deck height is usually .025 to .045" on a undecked block
with typical factory and replacement "flat tops"
The only way to tell is to actually measure your assembled short block. You can juggle the final cr with different thickness head gaskets.
At any rate your dynamic cr and mechanical cr will not be exessive with 64 cc heads.
with typical factory and replacement "flat tops"
The only way to tell is to actually measure your assembled short block. You can juggle the final cr with different thickness head gaskets.
At any rate your dynamic cr and mechanical cr will not be exessive with 64 cc heads.
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