need answer

[sled_head25]

my buddys 95 banshee was rebuild new piston,crank etc.well the pistons were hitting the head.so we put 20 thousnds gaskets under the juggs and now runs great and ripps again.his compression before all this was like 180 something so he ran racing fuel.now his compression is like 145.should he run 93 octane now?

[87_shee]

my buddys 95 banshee was rebuild new piston,crank etc.well the pistons were hitting the head.so we put 20 thousnds gaskets under the juggs and now runs great and ripps again.his compression before all this was like 180 something so he ran racing fuel.now his compression is like 145.should he run 93 octane now?

I think he should be ok with 93 at 145psi.

[sled_head25]

thanks

[IrideA250R]

whoa wait a minute..you rebuilt the banshee with a new crank and pistons, and the pistons hit the head? That doesn't seem right to begin with...also, while judging fuel requirements on cranking PSI may be decently accurate with a stockish Banshee, with one that has been modified you need to be more concerned with compression ratio. A high exhaust port may show lower cranking compression, when in fact the actual compression ratio is high enough to require race fuel.

[sled_head25]

ya we knew something was wrong,like longs rods,or stroker crank or something,but not sure.the way we knew we had a prob is leaking antifreese when floored."we did not pur this motor together his buddy did."so if it was your machine what would you do.he lost the receipt to find the part numbers on everything.he does have a milled head with dome pistons to i believe.thanks for all you input.this is how i learn

[IrideA250R]

I would take the head off and measure the stroke, then you'll know better what crank it has in it. It sounds like you don't have matching parts to me.

[87_shee]

could it be that whoever shaved the head took too much off? Just a thought :shrug:

[sled_head25]

no because the piston sticks out of the jugg a c hair