Hello Everyone,
I am in the process of building a new 70mm bore gx200 clone. For a mini bike application. It is stamped S170F.
So far....
*Undecided crankshaft*
Arc std. rod with bearing
Flat top 70mm piston
Black Mamba JR camshaft
27/25mm std. clone head (p&p mild)
Stainless single angle valves
Automotive keepers/retainers
26lbs valve springs
*Undetermined pushrod*
"Champion" style rocker
Aluminum recast flywheel 28*
Std carb, 140 etube, blah blah....
Doing block prep, and have 0 experience with gx style engines.
However, This is just for fun and my pure playtime, no rush. Piddeling/Fiddling and up to no good.
I noticed the oil return between the lifters was casted with large amounts of flaws and flashing. So I promptly hit it with a drill bit of a much larger size. Taking the diameter to the outside valley wall.
My question is...
Is there a benefit to port matching the head to the block in the area of the top end oil spray channel?
The channel is teardropped shaped in the block deck, but only a round hole in the head. Beneficial turbulence?
Any other tips to make this thing more reliable are welcome!
I am in the process of building a new 70mm bore gx200 clone. For a mini bike application. It is stamped S170F.
So far....
*Undecided crankshaft*
Arc std. rod with bearing
Flat top 70mm piston
Black Mamba JR camshaft
27/25mm std. clone head (p&p mild)
Stainless single angle valves
Automotive keepers/retainers
26lbs valve springs
*Undetermined pushrod*
"Champion" style rocker
Aluminum recast flywheel 28*
Std carb, 140 etube, blah blah....
Doing block prep, and have 0 experience with gx style engines.
However, This is just for fun and my pure playtime, no rush. Piddeling/Fiddling and up to no good.
I noticed the oil return between the lifters was casted with large amounts of flaws and flashing. So I promptly hit it with a drill bit of a much larger size. Taking the diameter to the outside valley wall.
My question is...
Is there a benefit to port matching the head to the block in the area of the top end oil spray channel?
The channel is teardropped shaped in the block deck, but only a round hole in the head. Beneficial turbulence?
Any other tips to make this thing more reliable are welcome!