8.3 is what it would be with the na pistons. The turbo pistons would make it an unworkable 7.2.
I'm planning on having them made for 9:1. That decision hasn't been finalized yet. I'm having Gary at Gary's Automotive in CA design the pistons and will take his opinions seriously in making the final decisions. He does a lot of engine work for professional rally subys and is a JE wholesaler with a lot of experience designing suby pistons. I've had Phil send him a spare piston already and I'm mailing him the rubbing i made of the combustion chamber and specs I measured today. After he has them we rediscuss things and come to the final decisions and piston design. You may want to look at the thread I started with my specs on the EG33.
http://www.subaru-svx.net/forum/showthread.php?t=30361
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Originally Posted by cdigerlando
I would agree that the NAs would be difficult to work with. When you said 8.3:1 were you refering to NAs or Turbos?
I think this discussion has really solidified the need for custom machined pistons for our applicatons!
LAN: What compression are you planning for your stage 3 kit? I was thinking 8.5:1 for my turbo. My wife has a turbo fxt with an automatic trans  It has an awesome streetable feel to it. These engines run about 8.4:1. |