Posted by jdemaris on January 18, 2011 at 12:39:23 from (67.142.130.16):
In Reply to: Re: alternator posted by Jim350 on January 18, 2011 at 12:18:10:
To be technical, when alternators are installed on tractors from the factory, they tend to have bigger pulleys then used on cars, not smaller.
Cars and trucks use small pulleys so alternators can put out a lot of current with the engine at low-idle speed. That because cars often have to stop at red lights, stop signs, traffic, etc. with many accessories on.
GM typically used 2 3/4" OD pulleys on Delco 10SIs and 12SIs in cars and trucks. When Deere used the same alternators, 3 1/2" OD pulleys were often used.
Big pulleys were often used to extend the life of the alternators for farm and industrial use. Bigger pulley equals less total RPMs turned. They also provide more traction for the belt. It is also why cars and trucks with V-belts DID have belt-slippage problems with big alternators and small pulleys.
Can't see where the big pulley is an issue. I've got 4" pulleys on many of my tractor alternators and the 10SIs easily make 30 amps at engine idle-speed.
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