Pulleys

[Captdavid]

I am planning to add the Reinhart pulleys to my Marauder on November 13.

What HP increase can I expect and what to they do?

Thanks

[FordNut]

I had a before & after dyno pull with that change only. Picked up 10 HP pretty much across the full RPM band.

[FLMARAUDER]

Do you need a more powerful alternator to keep lights and a.c. working properly at idle. I want to make this and other upgrades but I don't want the lights to go dim at stop lights, its a big load with stereo, sub, lights, ac, and brake lights all while idling.

Thanks for the info!

[FordNut]

Mine occasionally drops a little below 12 v when stopped and idling at night with everything running. Never below 11 v. You can have the idle increased with the chip if you want, but I don't see it as a problem since I don't usually sit still for long when I'm in mine.

[Captdavid]

I have done more reading on our site and see that Reinhart increases the rpm's by 200 and that keeps the voltage up. But I still to do understand the mechanics. I am only guessing but I think what is meant by pulleys is the belt drives being changed to a lighter material and perhaps a smaller size so they do not drag the engine down as much as the original ones. I don't know what underdrive means though.

[TAF]

Originally posted by Captdavid
I have done more reading on our site and see that Reinhart increases the rpm's by 200 and that keeps the voltage up. But I still to do understand the mechanics. I am only guessing but I think what is meant by pulleys is the belt drives being changed to a lighter material and perhaps a smaller size so they do not drag the engine down as much as the original ones. I don't know what underdrive means though.

You got it...one of the best mods for $s you can do...with NO downside...only upside.

[RF Overlord]

Originally posted by Captdavid
I don't know what underdrive means though.

If the "driving" pulley is larger in diameter than the "driven" pulley, the rotational speed of the driven pulley will be higher than that of the driving pulley. That would be called an "overdrive" setup, frequently used on Rootes-type blowers to increase the boost...but the extra speed has to come from somewhere, so it takes more power from the engine to produce this high drive ratio. When the reverse is true, the driven pulley turns slower than the driving pulley, and requires less power to turn, hence the term "underdrive"...

Also, as FordNut stated, if you regularly sit for long periods of time at idle with every electrical accessory in your car going full-bore at the same time, then you might need to increase the idle speed...otherwise, it's not enough of a problem to worry about...