Hey guys
A few questions with regards to porting.
Will shaping the piston bottom skirt to match the transfer port shape and matching the intake holes in the piston to the intake ports have any weakening/unbalancing effect on the piston?
I have discovered that auxillary ports can be drilled to link the intake chamber to the transfer ports below the piston. What size drill should be used here and can someone explain the exact function of these holes and does adding them have any worthwhile gains? do they allow constant airflow into the transfer ports when the main intake ports are blocked as the piston moves up and blocks them off? surely on a stock motor the intake air movement is stopped as the intake ports are shut off resulting in poor air flow?
I also see that when at BDC the piston does not fully drop below the transfer ports entering the cylinder. I think the piston stops about 1mm short of being flush with the bottom of the ports. A spacer plate would fix this by raising the barrel but that will mess up port timing?? also this would mean the top end would need 1mm skimming to correct compression. Does using a spacer plate have any worthwhile gains or does it cause more trouble than its worth?
Just trying to clear these things up before i start!
Thanx guys!
A few questions with regards to porting.
Will shaping the piston bottom skirt to match the transfer port shape and matching the intake holes in the piston to the intake ports have any weakening/unbalancing effect on the piston?
I have discovered that auxillary ports can be drilled to link the intake chamber to the transfer ports below the piston. What size drill should be used here and can someone explain the exact function of these holes and does adding them have any worthwhile gains? do they allow constant airflow into the transfer ports when the main intake ports are blocked as the piston moves up and blocks them off? surely on a stock motor the intake air movement is stopped as the intake ports are shut off resulting in poor air flow?
I also see that when at BDC the piston does not fully drop below the transfer ports entering the cylinder. I think the piston stops about 1mm short of being flush with the bottom of the ports. A spacer plate would fix this by raising the barrel but that will mess up port timing?? also this would mean the top end would need 1mm skimming to correct compression. Does using a spacer plate have any worthwhile gains or does it cause more trouble than its worth?
Just trying to clear these things up before i start!
Thanx guys!