Question about power pulleys.

nonamekevin · Posted: Mon Mar 01, 2004 4:32 pm Post subject: Question about power pulleys.

So I recently put a rebuilt engine into the 69 bug. It's running good, but I can definately tell the difference since the old engine used to have a power pulley on it. I talked to my local vw mechanic before I went ahead with this project, and he recommended that I get a stock pulley to make sure the engine doesn't run hot.

Now I have run pulleys on my mustang before, and they barely (stress barely) raised the temp on the engine. But for aircooled, I am wondering if it is much of a difference in temp between stock and power pulleys.

Do the benefits outway the negatives? And yes, I have all of my engine tin.

Thanks
-Kevin

auslander · Posted: Mon Mar 01, 2004 4:43 pm Post subject:

Here is a great article about it....
http://www.aircooledtech.com/over-sized_pulley/
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Jake Raby · Posted: Mon Mar 01, 2004 6:56 pm Post subject:

Its all in the shroud... with every system we ran I noticed a 20 degree temp increase for every time we slowed the fan down by 20%.
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nonamekevin · Posted: Mon Mar 01, 2004 9:41 pm Post subject:

Actually auslander, I was talking about undersized power pulleys. That article did answer some questions though.

Jake-I'm assuming those test you did were on alot of different engine combos, from completely stock shroud/engine, to your type IV's with the DTM shroud assemblies. How much effect does 20degrees hotter have on the engine and oil? I can see already I probably don't want to put a power pulley on this engine, but also want to get some more info.

Again, this is completely bone stock engine. Right down to the tin.

Thanks
-Kevin

Jake Raby · Posted: Mon Mar 01, 2004 9:46 pm Post subject:

It was the same engine with 13 different cooling systems tested on it with no tuning between rounds....

A stock engine is one of the hottest things on the planet, keep that drive at 1.58:1 (stock)
_________________
Jake Raby
Raby Engine Development
www.rabyenginedevelopment.com
"I've never given anyone Hell, I just told them the truth and they thought it was Hell"

nonamekevin · Posted: Mon Mar 01, 2004 9:47 pm Post subject:

Wow. Thanks for the quick response. Smile

-Kevin


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