atombikes
Member
Hi All,
Very new to the forum, but have been a framebuilder for a number of years. Most of my work has evolved around recumbents. I recently purchased one of these Lifan 79.5cc Harbor Freight Greyhound engines on sale for $71.99. I anticipate a period of planning and development, and hope to have something at least in a prototype stage in a couple months.
So here goes: I plan on building a frame that will enable me to use some sort of jackshaft thru a second bottom bracket on my custom frame. Will a normal 3 piece crank be adequate for the forces, and if so, how do I do this? Using a jackshaft like this will enable me to run the engine thru a seven speed freehub on the rear wheel.
I plan on using freewheeling cranks, so the cranks will freewheel when the engine is under power.
Does this sound like a plan?
Here is a pic of my early CAD drawing. My plan is to try to use the HF engine as intact as possible, to make the build easier.
<img src="http://lh6.ggpht.com/__jCR7Bfw3Fk/S0oRm3OsfzI/AAAAAAAAAI4/qZJSxg_owjw/s912/FUSION_MOTORED.jpg" />
Very new to the forum, but have been a framebuilder for a number of years. Most of my work has evolved around recumbents. I recently purchased one of these Lifan 79.5cc Harbor Freight Greyhound engines on sale for $71.99. I anticipate a period of planning and development, and hope to have something at least in a prototype stage in a couple months.
So here goes: I plan on building a frame that will enable me to use some sort of jackshaft thru a second bottom bracket on my custom frame. Will a normal 3 piece crank be adequate for the forces, and if so, how do I do this? Using a jackshaft like this will enable me to run the engine thru a seven speed freehub on the rear wheel.
I plan on using freewheeling cranks, so the cranks will freewheel when the engine is under power.
Does this sound like a plan?
Here is a pic of my early CAD drawing. My plan is to try to use the HF engine as intact as possible, to make the build easier.
<img src="http://lh6.ggpht.com/__jCR7Bfw3Fk/S0oRm3OsfzI/AAAAAAAAAI4/qZJSxg_owjw/s912/FUSION_MOTORED.jpg" />
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