Re: What should piston to wall clearance be
 

GPM thats 0055? How big of boat?

Re: What should piston to wall clearance be
 

The ring gap was fine, no sign of butting. The manufacturer originally said to run .0055 clearance. after seeing the pistons they said I should run .0075.

Re: What should piston to wall clearance be
 

26 cat

Re: What should piston to wall clearance be
 

GPM is that what your running now? (0075). Do you run at high rpms for extended periods of time? (Lots of heat) Are you supercharged? Thanks Greg

Re: What should piston to wall clearance be
 

.0075 is what I'm running, most of the time 25 to 3500, crank it once in a while for a minute or two, and it is Procharged.

Re: What should piston to wall clearance be
 

I would like a cat. I was thinking about an Eliminator 28 single. Whose do you have? Are you running an m-1 m-3 m-4? I have an M-4 and only ran it 1 time. Then boom. I used to have an M1 for 4 seasons. I think I had junk stuck in the oil cooler impeding flow to the motor. Maybe bad gas. Oh well gonna play! Greg

Re: What should piston to wall clearance be
 

I have a DCB. The 28 Eliminator would probably be better with twins, less drive problems. I ran the M-4 , then moved up to the M-5sc just to see what it would do. They both need a good fuel supply.

Re: What should piston to wall clearance be
 

yes I agree. I am thinking I will put this setup on the dyno before installing in the boat and watching the fuel pressure and egts etc. What kind of boost are you running? can you get 115 out of it? Greg

Re: What should piston to wall clearance be
 

Up to 15lb, On a good day 115 +

Re: What should piston to wall clearance be
 

Really, your outta control! Thats really cool. White knuckle baby! What compression ,Race gas? :D