I recently acquired a Toro snowblower with an H40 engine, hoping to transplant it into a Doodlebug or similar inexpensive mini bike chassis.
After removing the engine, I discovered it has a 1" output shaft. I guess this isn't uncommon, but it limits the selection of centrifugal clutches I can use.
Typically, I'd use a 3/4" bore clutch with 10T/#35 sprocket to use the original rear sprocket and maintain the standard gearing. However, it seems all the 1" bore clutches I see are 14T for use with a 420 chain. Now, I could theoretically get a new rear sprocket to fit a 420 chain, but worry I'd have to get a bigger diameter to lower the ratio down to something similar to standard (due to the 14T front sprocket). Doing that might get it too close in diameter to the rear wheel and limit cornering. Not to mention the expense of buying said sprocket...
So... I got to thinking about the possibility of using a 1" Chinese torque converter from eBay, like this: http://rover.ebay.com/rover/1/711-5...0001&campid=5335845805&icep_item=390581280696
It could be a good solution, but my concerns are:
a. Will it bolt to my H40 engine case?
b. Is 4hp enough to drive it?
c. It's output is designed for 420 chain, necessitating a new rear sprocket (which I hoped to avoid). That being the case, what size should I get?
Does anyone have any ideas I haven't thought of? I'm trying to keep it somewhat inexpensive, otherwise it would just make more financial sense to buy a Predator and go from there. That being said, I would like to make it something unique and like working with the old American engines.
After removing the engine, I discovered it has a 1" output shaft. I guess this isn't uncommon, but it limits the selection of centrifugal clutches I can use.
Typically, I'd use a 3/4" bore clutch with 10T/#35 sprocket to use the original rear sprocket and maintain the standard gearing. However, it seems all the 1" bore clutches I see are 14T for use with a 420 chain. Now, I could theoretically get a new rear sprocket to fit a 420 chain, but worry I'd have to get a bigger diameter to lower the ratio down to something similar to standard (due to the 14T front sprocket). Doing that might get it too close in diameter to the rear wheel and limit cornering. Not to mention the expense of buying said sprocket...
So... I got to thinking about the possibility of using a 1" Chinese torque converter from eBay, like this: http://rover.ebay.com/rover/1/711-5...0001&campid=5335845805&icep_item=390581280696
It could be a good solution, but my concerns are:
a. Will it bolt to my H40 engine case?
b. Is 4hp enough to drive it?
c. It's output is designed for 420 chain, necessitating a new rear sprocket (which I hoped to avoid). That being the case, what size should I get?
Does anyone have any ideas I haven't thought of? I'm trying to keep it somewhat inexpensive, otherwise it would just make more financial sense to buy a Predator and go from there. That being said, I would like to make it something unique and like working with the old American engines.