Does the 38cc 30DN cylinder fit the Zen G320 crankcase with a 30mm crankshaft?

[Mr. Marmot]

Hi. Can you put the 38cc cylinder from 30 degrees north (40mm piston, 30mm stroke) on top of a zenoah or rovan 32cc crankcase? Do the 4 bolt holes match? Thanks

 

[Dunc2504]

Think so , that is the same crankcase size as the rovan 36 I guess.
Not sure about the port match though, the 38 uses a machined billet crankcase.

 

[Mr. Marmot]

Yeah. Im concerned about transfer port match and bolt hole spacing

 

[Dunc2504]

Why not just go with an ESP head that is made for that engine ?
Power should be about the same I guess .

 

[Mr. Marmot]

I'd rather not touch my esp cylinders with a Dremel. The 38cc sounds like a better candidate, and the 40mm bore might make it easier, but I have never seen one in person. Does it have closed transfers?

 

[Dunc2504]

Why would you need to touch the ESP head when it is made for the Zenoah crankcase already ?
My point is , An ESP set is probably not far off the power output of the 38.

 

[Mr. Marmot]

Why would you need to touch the ESP head when it is made for the Zenoah crankcase already ?
My point is , An ESP set is probably not far off the power output of the 38.

I think I just wanted to see how good the 38cc cylinders are as a cheaper option for power and that I'm also willing to modify (unlike an ESP head, which I know they are good already, but more expensive)

 

[Dirty30J]

So this is a science experiment

 

[Dunc2504]

Why would you need to touch the ESP head when it is made for the Zenoah crankcase already ?
My point is , An ESP set is probably not far off the power output of the 38.

I would guess that the stud spacing is the same , but no idea about the ports.
Try getting hold of a 30 DN base gasket and try it on your crankcase.

 

[Mr. Marmot]

Indeed, it is a science experiment. I will try to get a base gasket, good idea, thanks. If anyone has done it, let me know