Compression ?
Thread Starter
Melting Slicks
Joined: Jan 2001
Posts: 2,022
Likes: 194
From: palm harbor/murphy Fl/NC
C6 of Year Finalist (performance mods) 2019
St. Jude Donor '11, '14
Compression ?
Can I run a 1990 L-98 at 11 and still use pump gas and have it run right ? I was talking to the the shop that is going to do the heads and he was a little uncertain a tuner could get the engine to run right. We were thinking of using a little larger gasket just in case.
I know some of you guys have "been their done that and bought the T-poopie". What do you think ?
Thks
Robin
:cheers:
I know some of you guys have "been their done that and bought the T-poopie". What do you think ?
Thks
Robin
:cheers:
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Re: Compression ? (zrracer)
I think you would have to run zero deck to minimize quench and have the chambers shapped for max swirl. Even then 11:1 might be a little much for a L98.
Of course a big cam will lower the squeeze (and detonation tendency), at least at lower RPM.
[Modified by 65Z01, 6:09 PM 5/22/2003]
Of course a big cam will lower the squeeze (and detonation tendency), at least at lower RPM.
[Modified by 65Z01, 6:09 PM 5/22/2003]
Thread Starter
Melting Slicks
Joined: Jan 2001
Posts: 2,022
Likes: 194
From: palm harbor/murphy Fl/NC
C6 of Year Finalist (performance mods) 2019
St. Jude Donor '11, '14
Re: Compression ? (65Z01)
It does have a big cam. How high would you suggest ? 10.8?
Thks,
Robin
:cheers:
Thks,
Robin
:cheers:
Burning Brakes
Joined: Oct 2002
Posts: 1,152
Likes: 1
From: Wichita KS
Re: Compression ? (zrracer)
A fellow forum member (Widebody) sent me this link on compression/detonation the other day.
Worth a read...
http://www.zhome.com/ZCMnL/PICS/deto...etonation.html
I cut and pasted this Info regarding the L98 engine from the link above;
1. Maximum compression on pump gas is around 10:1 with cast-iron heads and 11:1 with aluminium heads. With older combustion chamber designs like that of the L98, stay on the low side of 11 :1, around 10.75:1. If you want to add a supercharger or nitrous, drop the compression ratio 1 point.
[Modified by superlund, 6:00 PM 5/22/2003]
Worth a read...
http://www.zhome.com/ZCMnL/PICS/deto...etonation.html
I cut and pasted this Info regarding the L98 engine from the link above;
1. Maximum compression on pump gas is around 10:1 with cast-iron heads and 11:1 with aluminium heads. With older combustion chamber designs like that of the L98, stay on the low side of 11 :1, around 10.75:1. If you want to add a supercharger or nitrous, drop the compression ratio 1 point.
[Modified by superlund, 6:00 PM 5/22/2003]
