Amount of dish to atain ~9.5:1 CR
05-09-2002, 12:30 PM
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Car: 89 Formula / 09 G8
Engine: LS1 / LS3
Transmission: M6 / M6
Axle/Gears: 3:42 / 3:27
Amount of dish to atain ~9.5:1 CR
The setup will have 64cc heads with .030 over pistons. How much dish will I need to reach my goal? If anyone knows of a company that makes forged pistons that fit the profile, let me know please.
05-09-2002, 02:01 PM
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TRW and SPEEDpro make forged pistons for just about anything, you'll need to know what head gasket your gonna use, as well as deck height. But 9.5 is easy with 350. Isn't the stock ratio on an L98 around that?. But with a .051 thick head gasket, and the piston down in the bore .05, 64 cc heads, and flat top pistons you'll get 9.47
05-09-2002, 02:33 PM
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Car: 89 Formula / 09 G8
Engine: LS1 / LS3
Transmission: M6 / M6
Axle/Gears: 3:42 / 3:27
I have looked into TRW and SpeedPro, but not intensely. As far as head gaskets, I am clueless. The deck height will be stock.. I don't think that I will need to mill it during the rebuild. How do I control the amount that the piston is in the bore? Would this be done by the rods or the piston? It turns out that the standard CR for an L98 is 9.3:1. If thats the case would I be able to run all stock dimensions and a regular head gasket (what kind is recomended for mildly boosted applications?) to acheive that CR?
When gapping the pistons for a boosted application (6-8 PSI), what is the correct gap? I am going this in stages so I don't want to set it up for NA then have to change it later on. I also don't want to damage anything if it's setup for boost while it's NA.
Also. with a 2 bolt block running ~450HP and a max of 6K be ok? I have heard that it will be fine for ~400HP and up to 7K but I will not be up that high.
When gapping the pistons for a boosted application (6-8 PSI), what is the correct gap? I am going this in stages so I don't want to set it up for NA then have to change it later on. I also don't want to damage anything if it's setup for boost while it's NA.
Also. with a 2 bolt block running ~450HP and a max of 6K be ok? I have heard that it will be fine for ~400HP and up to 7K but I will not be up that high.
05-09-2002, 02:42 PM
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Car: 89 Formula / 09 G8
Engine: LS1 / LS3
Transmission: M6 / M6
Axle/Gears: 3:42 / 3:27
Using this link: http://www.sn95.com/projects/turbo/part1.htm It calculates the aproximate HP output and turbo size..
With a 5800 cid, 6K RPM limit, 8 PSI, single turbo intercooler setup it said I should use this turbo:
MAKE TYPE COMP TRIM TURBINE TRIM TURBINE HSG A/R
Garrett TO4 H3 P 1.49
With an output of: 531 BHP
Airflow #/min: 48.9
Can anyone tell me how accuarate this is? I am worried about the block needing to be upgraded from stock and having to use ALL forged internals instead of my original intentions of only pistons and rods.
With a 5800 cid, 6K RPM limit, 8 PSI, single turbo intercooler setup it said I should use this turbo:
MAKE TYPE COMP TRIM TURBINE TRIM TURBINE HSG A/R
Garrett TO4 H3 P 1.49
With an output of: 531 BHP
Airflow #/min: 48.9
Can anyone tell me how accuarate this is? I am worried about the block needing to be upgraded from stock and having to use ALL forged internals instead of my original intentions of only pistons and rods.
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