comp questions.
Thread Starter
Melting Slicks
Joined: Oct 2000
Posts: 3,010
Likes: 1
From: Sweden/Stockholm
comp questions.
On a N/A engine with alu heads and lt4 hotcam. Is 10.7 to much comp? Om looking for new pistons, and as im not going to spray or do any kind of F/I I thought I would get som small dome pistons instead of flat. And perhaps gain som hp.
Thanks
Thanks
Race Director
Joined: Feb 2004
Posts: 12,518
Likes: 19
My 1st and 2nd 383 had 10.5 :1 compression. The latest one has 10.7:1. I have always run 92 or 93 octane fuel with no problems. Until lately, I ran the stock programming as well. Alot of guys run much more. 10.7 is good
Thread Starter
Melting Slicks
Joined: Oct 2000
Posts: 3,010
Likes: 1
From: Sweden/Stockholm
Originally Posted by Pete K
My 1st and 2nd 383 had 10.5 :1 compression. The latest one has 10.7:1. I have always run 92 or 93 octane fuel with no problems. Until lately, I ran the stock programming as well. Alot of guys run much more. 10.7 is good
I wounder Is there any negative aspect of running a dome pistons? i heard it can mess upp things like air turbulence and quench??
regards..
Race Director
Joined: Feb 2004
Posts: 12,518
Likes: 19
As it was explained to me, domed pistons are inefficient. The flame has a hard time coming across the piston top. Some builders like flat tops and some like dished. Your cylinder head will likely decide which is best for you. In my case, my 383 has a 59cc chamber in the head, a 9.0 cc gasket and approx 13 or so cc's in the piston (at tdc) .
