Hell on Wheels
Member
- Local time
- 8:06 AM
- Joined
- Sep 26, 2018
- Messages
- 152
Hello everyone,
I blew my engine a while ago so I tore it down and I'm rebuilding it. So I got a DIO reed cylinder.
I placed the cylinder on the block and the piston created a huge overhang on the transfers and exhaust. I ground out the casting blemishes and it took 3 base gaskets (about 5mm) to raise the ports almost to the top edge of the cylinder at BDC (ran out of base gaskets and can't grind much more off the top of the head). Port timing after grinding the top down to the top fin and raising the port a little, I'm getting 160 degrees of exhaust and 115 degrees of intake and 20 degrees of boost. Stroke is 38. FM-80 Crank.
My question is, is stock port timing usually this awful without modification?? Is this cylinder meant for the 40mm stroke?
I have no clue what my original timing was because the cylinder was casted to the head.
I blew my engine a while ago so I tore it down and I'm rebuilding it. So I got a DIO reed cylinder.
I placed the cylinder on the block and the piston created a huge overhang on the transfers and exhaust. I ground out the casting blemishes and it took 3 base gaskets (about 5mm) to raise the ports almost to the top edge of the cylinder at BDC (ran out of base gaskets and can't grind much more off the top of the head). Port timing after grinding the top down to the top fin and raising the port a little, I'm getting 160 degrees of exhaust and 115 degrees of intake and 20 degrees of boost. Stroke is 38. FM-80 Crank.
My question is, is stock port timing usually this awful without modification?? Is this cylinder meant for the 40mm stroke?
I have no clue what my original timing was because the cylinder was casted to the head.