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07-06-2015, 10:41 PM
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#11
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I, Vettezuki
Join Date: Feb 2006
Posts: 14,754
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PS Adam's Vette is still the fastest car I've been from a roll. It's pretty ridiculous. My guess, and it is a guess, is well over 500 to the wheels and whatever his weight is, plus fairly short gearing AIR. Same as my Vette though, I don't think it'd be particularly fast in teh 1/4 because the suspension is all wrong to launch worth a shit. It'd be like 12 @ 130 or something stupid like that.
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07-07-2015, 02:37 PM
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#12
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Super Moderator
Join Date: Dec 2007
Posts: 6,850
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Thanks? Haha.
Compression has always been this low. Even before the motor was first fired. I've often been cautioned by gear heads about it. But I have low compression, and fatty NA intended overlap. I really need a blower cam... and by B Day is 21 days away! ...just sayin 
Engine makes power, doesn't burn oil, and the compression is consistent, it's fine.
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I <3 forced induction.
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07-07-2015, 06:18 PM
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#13
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pain's fun, hit me again
Join Date: Sep 2009
Posts: 6,264
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Quote:
Originally Posted by enkeivette
Thanks? Haha.
Compression has always been this low. Even before the motor was first fired. I've often been cautioned by gear heads about it. But I have low compression, and fatty NA intended overlap. I really need a blower cam... and by B Day is 21 days away! ...just sayin
Engine makes power, doesn't burn oil, and the compression is consistent, it's fine. |
How did you test cranking compression before you fired it?
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Quote:
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Originally Posted by Bruce Lee
Forget about winning and losing; forget about pride and pain. Let your opponent graze your skin and you smash into his flesh; let him smash into your flesh and you fracture his bones; let him fracture your bones and you take his life. Do not be concerned with escaping safely — lay your life before him
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07-07-2015, 10:44 PM
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#14
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Fast & Filthy
Join Date: Jun 2008
Posts: 3,840
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What's your static compression, piston to head clearance and cam specs? The Chevelle has decent overlap with 246 duration at .050 and a 110 LSA.
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07-08-2015, 07:35 AM
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#15
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Super Moderator
Join Date: Dec 2007
Posts: 6,850
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Quote:
Originally Posted by Shaolin Crane
How did you test cranking compression before you fired it?
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Put the compression tool in the spark plug hole and ran the starter motor before I ever first fired it.
Compression is like 9:1, cam is 110 246 248? Or something...
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I <3 forced induction.
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07-08-2015, 07:39 AM
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#16
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Super Moderator
Join Date: Dec 2007
Posts: 6,850
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Piston to head, don't remember. I think my pistons are like .02 down and the HG is .05. So prob .07. Some people cry about quench but the thicker HG/ lower CR was more important to me. AFR and speed talk tells me quench is of little consequence when the boost does the swirling.
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I <3 forced induction.
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07-08-2015, 09:14 AM
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#17
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Fast & Filthy
Join Date: Jun 2008
Posts: 3,840
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.070 isn't great but the Cobra is at .053 if I remember correctly. Even with the old 302 setup which had a compression ratio around 8.7-8.8 and a cam that had 110 LSA with 220 @ .050 it still cranked 150psi. Something isn't right. Does your car run good, sure. Could it run better, most likely.
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07-08-2015, 09:15 AM
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#18
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pain's fun, hit me again
Join Date: Sep 2009
Posts: 6,264
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Quote:
Originally Posted by enkeivette
Put the compression tool in the spark plug hole and ran the starter motor before I ever first fired it.
Compression is like 9:1, cam is 110 246 248? Or something...
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So before the engine was ever broken in? Not sure that would be an accurate compression test.
__________________
Quote:
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Originally Posted by Bruce Lee
Forget about winning and losing; forget about pride and pain. Let your opponent graze your skin and you smash into his flesh; let him smash into your flesh and you fracture his bones; let him fracture your bones and you take his life. Do not be concerned with escaping safely — lay your life before him
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07-08-2015, 08:05 PM
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#19
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Super Moderator
Join Date: Dec 2007
Posts: 6,850
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Quote:
Originally Posted by 94cobra69ss396
.070 isn't great but the Cobra is at .053 if I remember correctly. Even with the old 302 setup which had a compression ratio around 8.7-8.8 and a cam that had 110 LSA with 220 @ .050 it still cranked 150psi. Something isn't right. Does your car run good, sure. Could it run better, most likely.
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Ive been through 4 HG replacements, probably 10 intake manifold replacements, and 2 sets of piston rings. What could possibly account for a uniform loss of compression in all cylinders, that does not cause oil consumption, loss of mpg, or at least a significant loss of power, while persisting through all of those changes?
Quench alone shouldn't change a compression reading. 9:1 with a 110 should produce the same measurement no matter how that air is swirling around in there.
Guy, yes, compression test was the same before and after break in.
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I <3 forced induction.
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07-08-2015, 11:31 PM
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#20
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pain's fun, hit me again
Join Date: Sep 2009
Posts: 6,264
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Quote:
Originally Posted by enkeivette
Ive been through 4 HG replacements, probably 10 intake manifold replacements, and 2 sets of piston rings. What could possibly account for a uniform loss of compression in all cylinders, that does not cause oil consumption, loss of mpg, or at least a significant loss of power, while persisting through all of those changes?
Quench alone shouldn't change a compression reading. 9:1 with a 110 should produce the same measurement no matter how that air is swirling around in there.
Guy, yes, compression test was the same before and after break in.
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Ring gap, pushrod length, rockers, lifters, basically anything valve train related could cause uniform compression issues if something was not installed right or a wrong part was used. Not uncommon for people to think they have compression loss only to find out they have way too much preload on the valve train.
I don't have any one thing I can say it would be, however I do know that 9:1 should make a minimum of 130psi with a 110 lobe center. Are you positive you calculated the compression properly? What df the heads CC out to?
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Quote:
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Originally Posted by Bruce Lee
Forget about winning and losing; forget about pride and pain. Let your opponent graze your skin and you smash into his flesh; let him smash into your flesh and you fracture his bones; let him fracture your bones and you take his life. Do not be concerned with escaping safely — lay your life before him
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