External Alternator Q's

[Damien]

While you are doing it you may want to add some weight to the fly wheel. A lot of off road bikes run a heavier flywheel on the desert versions than the moto/super cross versions. I'd love to have a heavier flywheel on my buggy as the clutch is very difficult to use percisely and I end up stalling a lot. A heavier flywheel would help a lot.

[nutz4sand]

Originally Posted by Damien

While you are doing it you may want to add some weight to the fly wheel. A lot of off road bikes run a heavier flywheel on the desert versions than the moto/super cross versions. I'd love to have a heavier flywheel on my buggy as the clutch is very difficult to use percisely and I end up stalling a lot. A heavier flywheel would help a lot.

I would imagine deeper gearing would be as good if not better than a heavier flywheel for that.

[Fabdoc]

A heavier flywheel on a crank end not necessarily designed for it combined with a touchy clutch and lots of traction could result in the end of the crank taking its own path down the trail. Through in any amount of imbalance and you increase the chance of it happening. In-line motors already deal with crankshaft torsional whip and various deflections as they run through the revs. Flywheels are designed by the engineers to do a specific job for a particular motor. Getting to far away from the OEM intent could be an expensive proposition.

[FugginZukin]

I definitely understand what you are saying. I don't believe my pulley/shaft combo will be any heavier than the stock flywheel. The idea was derived from a guy I found on the net who dropped a GSXR750 into a Suzuki Samurai Rock Crawler. He attached a pulley the same way I am considering for both power steering and alternator. I am not sure whether he balanced his assembly or not. I do know he has been beating the piss out of it for at least a year without the slightlest problem in that area.

I think instead of welding the pulley to the shaft, I will machine the pulley for a hard press. The pulley bolt will come in on top of the pulley at approx. 80 ft. lbs. After I get the pulley pressed on I will take it somewhere to be balanced. Anyone see a potential problem with this?

The only issue I can foresee is compensation for the stock keyway. In other words, if I balance my pulley/shaft assembly off the motor, will it then be out of balance once I stick it on the crankshaft because of the little half moon? Or will the groove for the half moon make up the difference? I am hoping so. I am assuming the flywheel was balanced off of the crankshaft; therefore, I should be OK, no?

[FugginZukin]

Originally Posted by Fabdoc

A heavier flywheel on a crank end not necessarily designed for it combined with a touchy clutch and lots of traction could result in the end of the crank taking its own path down the trail. Through in any amount of imbalance and you increase the chance of it happening. In-line motors already deal with crankshaft torsional whip and various deflections as they run through the revs. Flywheels are designed by the engineers to do a specific job for a particular motor. Getting to far away from the OEM intent could be an expensive proposition.

In researching this more, the flywheel serves no purpose to balance the engine (on this engine). It's only purpose is for charging the electrical system. The motor I am using is internally balanced meaning the rotating assembly is balanced inside the outer crank bearings via gear-driven balancer. If my pulley setup is balanced, it should have zero effect on the engine maintaining "internal" balance regardless of its weight. I will be moving forward.

[millbilly]

Look up Perptual balance... I Think they have a 800 number. Give them a call, they do good work and likes to talk.

[FugginZukin]

Originally Posted by millbilly

Look up Perptual balance... I Think they have a 800 number. Give them a call, they do good work and likes to talk.

Good source. Thanks!