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Old July 24th, 2016, 11:59 AM   #1
whozawhat
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Default serpentine belt pulleys
Re:: anyone have sizes?   

I am trying to figure out some pulley ratio questions and I was hoping someone that is running a serpentine belt and pulley setup could tell me what are the sizes of the drive and driven pulleys ?
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Old July 24th, 2016, 01:35 PM   #2
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Default Re: serpentine belt pulleys

If a factory system will help, my '99 V6 Ford Ranger has a serpentine system and I can give you dimensions.
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Old July 24th, 2016, 01:58 PM   #3
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Default Re: serpentine belt pulleys

actually looking for the aftermarket serpentine belt kits that are available for the vw type 1 engine like the kit offered by Scat and others. but thanks for the offer
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Old July 24th, 2016, 05:51 PM   #4
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Default Re: serpentine belt pulleys

Some VW guys say serpentine drive, is hard on fans.
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Old July 24th, 2016, 06:12 PM   #5
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Default Re: serpentine belt pulleys

trying to determine the best pulley setup to allow for blower drive.
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Old July 25th, 2016, 09:51 AM   #6
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Default Re: serpentine belt pulleys

yes.
Could you use a stock v belt and a multi V belt ?
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Old July 25th, 2016, 03:42 PM   #7
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Default Re: serpentine belt pulleys

That is what I am working towards, separate belts, just need to figure the pulleys that I will use, a quick change hub on the blower would be ideal to allow pulley changes to dial in the boost.

Fernon sent me dimensions of his belt pulley setup so I have that info now.
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Old July 25th, 2016, 06:42 PM   #8
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Default

Stuff I've seen on serpentine drives is they are useless at any real boost. Cog belts are where it's at

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Old July 25th, 2016, 07:12 PM   #9
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Default Re: serpentine belt pulleys

not planning enough boost for a cog belt, serpentine belts run lots of blowers these days without slipping
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Old July 26th, 2016, 10:42 AM   #10
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Default Re: serpentine belt pulleys

The factories use serpentine belts to drive Eaton and similar blowers.
So that is no problem, on the street.

Full race, is another story.

The ratio of pulley sizes, should be the same as stock, to maintain cooling.
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Old July 31st, 2016, 01:06 PM   #11
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Default Re: serpentine belt pulleys

When they say that pulleys are hard on the belts, it has to do with the reverse bend it does. The main thing that the serp setup does is that it provides a touch more pulley to belt contact area. Now if you crank that extra pulley down too hard, something is going to give and usually it's the belt. Start up a VW engine and that belt does dance around a bit. IT also has a touch of slack due to the engine heat/ expansion.

The serp systems aren't bad, Corvair did them for years with a twist involved, you just have to make sure the tension is correct and everything is aligned.
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Old August 1st, 2016, 05:26 AM   #12
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Default Re: serpentine belt pulleys

Quote:
Some VW guys say serpentine drive, is hard on fans.
Quote:
When they say that pulleys are hard on the belts, it has to do with the reverse bend it does.

Apples to oranges?
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Old August 1st, 2016, 08:23 AM   #13
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Default Re: serpentine belt pulleys

It's not hard on the fans, it's the tension on the pulley/ shaft.
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Old August 1st, 2016, 02:12 PM   #14
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Default Re: serpentine belt pulleys

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Some VW guys say serpentine drive, is hard on fans.
What I've seen with the serp belts is that they're hard on the on the bearings in your alt/gen. Especially if you're running one of the cheap knock-off ones from China... And if you're running high revs (over 5K) they're hell on a non-welded fan.

I might run one on the motor I'm building for the buggy. Its' going to be a pretty stock setup and I hate how crappy new fan belts are these days. They barely fit and wear out in a heartbeat. It kills me when I install a new belt and I can only run 2 shims between the pulley halves...
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