Compression.
03-29-2014, 07:20 AM
#1
TECH Enthusiast
Thread Starter
Compression. I just decided to go with a supercharger but I think I have to change my heads.as of now I have a 98 ls1 motor that's gonna get rebuilt with forged rods and pistons,I have a set of fresh never ran tea ls6 stage two heads milled to 59cc and a ported fast 92.is there a piston and head gasket I can get to get the cr back down to run supercharger
03-29-2014, 12:40 PM
#2
Cometic makes gaskets in several different thicknesses. You can go to their site to order up to .086 thickness. Assuming you are still within OE spec for the stacked heights, going with a thicker gasket could cause some pain in getting a manifold on. A company makes spacers to make up the difference when running a thicker gasket, but you'll need to get measurements. I learned this the hard way. As a member told me, it is best to adjust compression with pistons, and keep everything else within spec to save you frustration.
03-29-2014, 03:35 PM
#5
Old school says no ... New school says yes.
It's all in the tune ( and a little meth for safety). You will love the higher compression for street driving out of boost, as it will be peppy and responsive. I'm at 11.2:1 @ 10 lbs and love it. I believe Alchemist is at 10.5:1 @ 15 lbs ? , and he has a stellar set up. It's all about a safe tune. If your replacing the cam, this would be a good time to have one specced that can reduce the Dynamic compression a bit. My decision was made for me when I realized that there were many over in the GTO world boosting stock LS2's with 10.9:1 CR and having great results over a long period. Now the opposite argument can be made if you are going for max effort on a strictly track car. The old school will usually win here as low compression will allow for more boost ( efficiently). I'd say if it's a street/ strip car .... Leave your compression where it is.
It's all in the tune ( and a little meth for safety). You will love the higher compression for street driving out of boost, as it will be peppy and responsive. I'm at 11.2:1 @ 10 lbs and love it. I believe Alchemist is at 10.5:1 @ 15 lbs ? , and he has a stellar set up. It's all about a safe tune. If your replacing the cam, this would be a good time to have one specced that can reduce the Dynamic compression a bit. My decision was made for me when I realized that there were many over in the GTO world boosting stock LS2's with 10.9:1 CR and having great results over a long period. Now the opposite argument can be made if you are going for max effort on a strictly track car. The old school will usually win here as low compression will allow for more boost ( efficiently). I'd say if it's a street/ strip car .... Leave your compression where it is.