Thread: UR Pulleys Belt Size?

well the thing i would think would make the most negative effect on the rotating assembly would be replacing the flywheel, reason being is everything stock is harmonically balanced with all stock parts. then you replace the flywheel and it is one of the most weight reduction part you can replace on the rotating mass, and there is no ill effect with it.

and you would say yea well the flywheel isnt harmonically balanced, but the thing is, it is reducing and taking ALOT of weight off the flywheel side of the motor, but keeping the heavier stock pulley. you would think even tho the stock pully isnt that heavy it still doesnt serve the same pully to flywheel weight ratio as stock, so in theory, the lighter flywheel along with the lighter pully would have somewhat of the same kinda weight ratio as stock configurations. at least that is what i would think.

Hey everybody, use these UR crank pulleys, makes no difference to me!!!!

I hope everybody's SR's last forever!!

That was like one super huge load of BS man! THe crank is internally balanced on our cars, the pulleys and flywheel are balanced themselves so swapping them has no effect on the balance of the rotating assembly.

Brent

Yes, the crank is well balanced from the factory, install a unbalanced part on the crank, your crank is no longer balanced!!!!!!

What do you not understand about internally balanced? Maybe if our cars were GM's we'd have to worry about the flywheel and the crank..

No you are not.

Look, just state your facts here, don't give me this "No your not" crap!!!

What do you not understand, Nissan did not install a balanced crank pulley on the SR20 for the hell of it.....lol!!!!

It was installed to keep the entire crank balanced!!!!!!!!!

Internally balanced engines are counterweighted by the crankshaft counterweights. Externally balanced engines are balanced by adding counterweights at each end of the crankshaft outside of the crankcase.

Pretty much every Nissan engine out there is internally balanced, including our SR20DE's.


Seriously, what do you not understand about internal vs. external balancing?

ok some people dont know what a theory is. i was simply stating that you would THINK if any internal difference was going to make a difference in the way the engine behaves it would be the reduction between the stock flywheel and the aftermarket flywheel.

SINCE IT DOESNT MAKE A DIFFERNECE. then neither would a lighter crankshaft pully.

that is what i was saying