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Old 02-05-2015, 07:35 AM
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cannonball2 cannonball2 is offline
Motorized Bicycle Elite Member
Join Date: Oct 2010
Location: Colonial Coast USA.
Posts: 3,286
Default Re: Curious about the engine, :question:

My conclusions are be careful buying parts. With the turn over of engines/parts inventories you may or may not get whats advertised. I don't think web pages are always change when the inventory does. One supplier just updated his page. What was indicated was not what was received.
My take away on the crank/rod/piston discussion is that the GT5 type engine with the 114mm rod is made to be a true 38mm engine, as the piston reaches the top of the cylinder. What the porting is I cant say as Im not a high-pro guy. The rest of the 38mm cranks with the 110 rod make the 1/2 breed and will require a lot of jug work. And there is the 40mm crank which is what I think that most of the jugs were designed for. My FH engine is 40mm.
So once again as always it sort of a crap shoot as to what you will really wind up with. If you are not able to radically machine a jug, I would say either a GT5 engine or an engine with a verified 40mm stroke is the way to go. Problem is finding folks that really know what they have.
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