is 11.5:1 to much compression for 91
Banned
Joined: May 2003
Posts: 6,661
From: LA (lower Alabama)
Re: is 11.5:1 to much compression for 91
Originally Posted by kart90
You need it at seat?
I only have @ .020 and .050
@.020 its 286-296
only way to get it at 0 is to profile the cam that I know of
I only have @ .020 and .050
@.020 its 286-296
only way to get it at 0 is to profile the cam that I know of
Registered User
Joined: Aug 2003
Posts: 704
From: Imperial, MO.
Re: is 11.5:1 to much compression for 91
i am in a similar situation right now, building a 355. i want to get a real big cam (weekend car) and my cam guy is telling me i can easily run 11.5 to 1 or 11.8 to 1 on pump gas? i talked to combination motorsports, a speed shop, and my machine guy and they said u need to stay below 11 : 1 compression for pump gas, but at the same time, i KNOW people running up to 12:1 just fine on pump gas...but his car did blow up, lol. anyways, i'm stuck with buying a smaller cam to accomidate my 10.6:1 compression setup. i'd call a FEW machine shops and ask them, they build that sh it every day ya know. good luck.!
Registered User
Joined: Feb 2001
Posts: 26
Re: is 11.5:1 to much compression for 91
Originally Posted by 1racerdude
What's your CID,rod length,piston type and relief volume, 2 or 4 eyebrow,head CC's,piston in hole depth,and I will run it at .020 if that is there adv numbers.Give me the IVC point at .020 also and I will compare.
SRP -5cc (2)
56cc heads
Felpro 1074 head gaskets(.039 thick)
block decked to 0.010
250/258@.050 109LSA put in at 108 centerline
bore 0.040
stoke 3.75
Rods 6"
No IVC numbers with me
Banned
Joined: May 2003
Posts: 6,661
From: LA (lower Alabama)
Re: is 11.5:1 to much compression for 91
Originally Posted by kart90
SRP -5cc (2)
56cc heads
Felpro 1074 head gaskets(.039 thick)
block decked to 0.010
250/258@.050 109LSA put in at 108 centerline
bore 0.040
stoke 3.75
Rods 6"
No IVC numbers with me
56cc heads
Felpro 1074 head gaskets(.039 thick)
block decked to 0.010
250/258@.050 109LSA put in at 108 centerline
bore 0.040
stoke 3.75
Rods 6"
No IVC numbers with me
Your dynamic is 9.046
That is the max with 92 octane.Ya gonna need a good tune and cooling to run this on the street or 110 VP fuel.
Banned
Joined: May 2003
Posts: 6,661
From: LA (lower Alabama)
Re: is 11.5:1 to much compression for 91
Originally Posted by kart90
Wow So What Would It Be With 0.029 Impala Gaskets?
Dynamic is 9.297
This is with a .029 gasket.The Impala gasket is less than .029.
Banned
Joined: May 2003
Posts: 6,661
From: LA (lower Alabama)
Re: is 11.5:1 to much compression for 91
Originally Posted by kart90
What are the limits on DC for good cooling ? Evans coolant help help?
This is with a LARGE radiator, Evans and all the tricks pulled out of the hat.
Registered User
Joined: Jan 2004
Posts: 1,322
From: San Francisco
Re: is 11.5:1 to much compression for 91
Damn, $20 for every person that wants to know from now on!!! J/K
1racerdude do mine doing mine also?
CID: 383
Rod Length: 6.00"
Piston Type: SRP -16cc
Head: 54cc
ADV DUR on Cam: 290/290 (ABDC 48.6)
Stock Head Gaskets: 0.49?
thanks a million!
1racerdude do mine doing mine also?
CID: 383
Rod Length: 6.00"
Piston Type: SRP -16cc
Head: 54cc
ADV DUR on Cam: 290/290 (ABDC 48.6)
Stock Head Gaskets: 0.49?
thanks a million!
Last edited by Deenasty; Mar 22, 2005 at 05:06 PM.