3.6 track engine

[r lane]

I am building a 3.6 track motor with CR being 12.45 to 1.0. Was thinking I wanted no more than 12 to 1. I can remove 1.6cc from the dome and get it down to 12.0. I don't know a magic number for compression on these motors. The 3.6 is I think more susceptible to blow by due to the additional span of its cylinder heads. does a half point matter. Any good info greatly appreciated. Bob

[Henry Schmidt]

Originally Posted by r lane

I am building a 3.6 track motor with CR being 12.45 to 1.0. Was thinking I wanted no more than 12 to 1. I can remove 1.6cc from the dome and get it down to 12.0. I don't know a magic number for compression on these motors. The 3.6 is I think more susceptible to blow by due to the additional span of its cylinder heads. does a half point matter. Any good info greatly appreciated. Bob

Cylinder head stability is primary. Of course I would recommend Supertec Head studs no matter how much compression you choose.
I believe there is very little performance difference between those compression numbers.

[pocv0]

This is where you will get schooled on static compression and dynamic compression from the board.
The last 993 3.6 liter I built was 12.5 : 1 CR (static,JE pistons) , GE100 cams , twin plug ,Carrillo rods and on the dyno 319 RWHP. Of course this was on race fuel. If this is for a track car why do you want to lower compression? Blow by? I didn't have any issues, logged around 30 track hours on the engine then sold it.