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Old 03-07-2010, 04:43 PM   #1 (permalink)
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Light weight pulley's

I was looking at getting some light weight pulleys for my car. I wanted the increased power from them. But then though do the light weight pulley giver better FE as well as more power?

Has anyone on here ever tried light weight pulleys on their car?
IE http://www.arkperformance.com/Produc...de=BU0701-0105

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Old 03-07-2010, 05:16 PM   #2 (permalink)
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...couple them with "electric clutch" (like A/C units) and you've got a winner!
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Old 03-07-2010, 05:26 PM   #3 (permalink)
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These would be appropriate on a Bugatti Veyron or a McLaren M1, or you could just use your money for kindling.
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Old 03-07-2010, 06:08 PM   #4 (permalink)
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Old 03-07-2010, 06:56 PM   #5 (permalink)
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wildfire8 -

I've been tempted to do it, but I wouldn't be doing the installation. That means it would cost me maybe ~$250 in parts + labor to install. On the advice of others on this site I didn't go for it because it's not worth the money.

I am curious. In the url it says that it requires this belt :

Quote:
- Requires replacement belt - 31inch size
Is this the same size as your current OEM belt?

Also, have you asked about this on a Hyundai forum? I am thinking they would be able to tell you if there are any benefits and/or side effects.

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Old 03-07-2010, 07:22 PM   #6 (permalink)
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Going w/ lightweight pulleys could increase FE by maybe a half a percent or so w/ a typical driver in stop and go city, but technically if someone is driving efficiently they shouldn't be stopping and going that much, so it's kind of a moot mod for most efficient drivers. If someone is racing otoh, dropping ~15-20lbs off of the powertrain's rotating mass is the equivalent to adding a few to several HP in first gear depending on the max engine speed/gearing, so it's cost effective in that sense.
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Old 03-07-2010, 07:25 PM   #7 (permalink)
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Old 03-07-2010, 07:29 PM   #8 (permalink)
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Once the mass is spinning it takes very little energy to keep it spinning regardless of weight. The lighter pulley will let the engine spin up faster and down faster than heavy ones. The total rotating mass in the engine is quite large compared to the weight saved with these pulleys. My guess is the only time you would notice them is when you opened the hood.
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Old 03-07-2010, 07:30 PM   #9 (permalink)
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[QUOTE=wildfire8;164815]I was looking at getting some light weight pulleys for my car. I wanted the increased power from them. But then though do the light weight pulley giver better FE as well as more power?

Has anyone on here ever tried light weight pulleys on their car?
IE

FE: Unlikely change as the weight change will be very small but the energy used to accelerate and decelerate the weight saved will not be needed so there will probably be some gain however small.

POWER: See above. Sorry but the power saved will again be small.

If the original pulleys are smooth it may even give less FE and power as the aero drag is increased.

I used them many years ago but to fix some weird harmonic in an engine in a boat which was destroying alternators at a great rate.
The fix by the way was to replace the fancy alloy spoked pulley with plain pressed steel unit with a different harmonic frequency but the same diameter.

It worked.

Pete.
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Old 03-07-2010, 07:50 PM   #10 (permalink)
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Peter7307 -

Quote:
Originally Posted by Peter7307 View Post
...

I used them many years ago but to fix some weird harmonic in an engine in a boat which was destroying alternators at a great rate.
The fix by the way was to replace the fancy alloy spoked pulley with plain pressed steel unit with a different harmonic frequency but the same diameter.

It worked.

Pete.
Thanks for posting this. This is what I mean by a side-effect. Do you remember if the "fancy alloy spoked pulley" was OEM or ???

I think a light weight pulley may introduce the same problems because it's not OEM. That is why I wanted to know if someone on a Hyundai forum had done this.

CarloSW2

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