Re: Difference between 10.5 and 11.0 cr
[Re: Sport440]
#1283128
08/10/12 07:10 PM
08/10/12 07:10 PM
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Joined: Jan 2003
Posts: 11,729 Portage,michigan
B3422W5
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 11,729
Portage,michigan
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It is well documented that the power difference regarding compression will be larger with lower compression to start with. In other words, you would gain more power going from 9 to 1 to 10 to 1 than you would going from 13 to 1 to 14 to 1. Hope that makes sense.
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight 418 BPE factory replacement headed stroker, 565 lift solid cam Best so far, low 10.30’s 1/4 1.41 best 60 foot 6.56 at 104.17
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Re: Difference between 10.5 and 11.0 cr
[Re: Wedgeman]
#1283129
08/10/12 07:47 PM
08/10/12 07:47 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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A difference in heads will be a factor also... alum heads may see a bigger benefit due to alum heads like more compression to equal out to iron
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Re: Difference between 10.5 and 11.0 cr
[Re: Wedgeman]
#1283130
08/10/12 08:02 PM
08/10/12 08:02 PM
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Joined: Oct 2004
Posts: 8,165 Left Coast
BobR
master
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master
Joined: Oct 2004
Posts: 8,165
Left Coast
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Quote:
Hey...! My 408 has 10.5:1 cr...my 60ft is 1.47...
I wonder if I could notice any difference in performance if I step up to thinner heads gasket and get 11.0:1 cr ?
Speculate on that please
Dan 67 Barracuda
Very little difference. Less than 10 HP.
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Re: Difference between 10.5 and 11.0 cr
[Re: Wedgeman]
#1283133
08/10/12 10:23 PM
08/10/12 10:23 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
408 Indy headed I was hoping to gain .2 sec in the 1/8 mile...
just by swaping to thinner head gaskets....cheap horsepower to me , go from 6.75 to 6.55.. Dan
I think your asking alot for just the head gasket but thats... JMO
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Re: Difference between 10.5 and 11.0 cr
[Re: Wedgeman]
#1283140
08/11/12 04:31 AM
08/11/12 04:31 AM
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Joined: Jan 2003
Posts: 6,591 Canton, Ohio
Sport440
master
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master
Joined: Jan 2003
Posts: 6,591
Canton, Ohio
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Quote:
408 Indy headed I was hoping to gain .2 sec in the 1/8 mile...
just by swaping to thinner head gaskets....cheap horsepower to me , go from 6.75 to 6.55.. Dan
At your level of performance, you will not see a 2 tenths gain with a 1/2 point comp increase. Nope/No way!
If your running 6.75,s now, with that 1/2 point bump, Id expect high 6.68,s or so.
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Re: Difference between 10.5 and 11.0 cr
[Re: Sport440]
#1283142
08/11/12 12:22 PM
08/11/12 12:22 PM
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Joined: Jan 2008
Posts: 795 Glendale Az
Darryls-Demon
super stock
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super stock
Joined: Jan 2008
Posts: 795
Glendale Az
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Quote:
Quote:
408 Indy headed I was hoping to gain .2 sec in the 1/8 mile...
just by swaping to thinner head gaskets....cheap horsepower to me , go from 6.75 to 6.55.. Dan
At your level of performance, you will not see a 2 tenths gain with a 1/2 point comp increase. Nope/No way!
If your running 6.75,s now, with that 1/2 point bump, Id expect high 6.68,s or so.
With 440sport, its not like your cylinder pressure is low now so I just can not see how a 1/2 point more will make that much difference.
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