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Summit underdrive pully?

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Old Dec 14, 2007 | 06:10 PM
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Default Summit underdrive pully?
just wondering if anyone has used or heard anything about the summit brand underdrive balancer? here's a link.

http://store.summitracing.com/partde...DC2502&FROM=MG
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Old Dec 14, 2007 | 07:31 PM
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Interesting. SFI rated and the price is right.
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Old Dec 14, 2007 | 08:51 PM
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I have used a similar one from Jegs....it was made by Pioneer. Most balancers like this one are more than likely built by the same company. Mine fit perfect and never had a problem.
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Old Dec 14, 2007 | 11:02 PM
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thats not a bad price, if they are any good.
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Old Dec 15, 2007 | 08:23 AM
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Looks identical to the Powerbond/SLP 25% underdrive pulley...just a little cheaper price.
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Old Dec 15, 2007 | 08:39 AM
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I've been very happy with Summit's "house" branded products that I have bought so far.
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Old Dec 15, 2007 | 08:43 AM
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what type of affects are you going to get from something like this if any? increased hp?
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Old Dec 15, 2007 | 09:13 AM
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An underdrive is a no brainer. If GM wanted to reduce the parasitic loads on the engine they would come from the factory with one. Not only that but, all those devices last a lot longer because they spin 25% slower throughout their lifetime. Why do water pumps and A/C compressors fail a lot of times? The bearings wear out. With an underdrive the bearings are going to live longer. Your fuel mileage goes up and wasted horsepower is directed to the wheels instead of out the tailpipe. I looked up this item on the Summit website after seeing this post. There are two available. One has a 6.750 dia. while the other is 6.140 even though they are both rated at 25% underdrvie. We know that can't be true. I know which one I'm buying. 5/8" isn't a whole lot, but it might give an extra 5%. Every little bit helps.
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Old Dec 15, 2007 | 08:47 PM
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Anybody have any experince with March underdrive pulleys? Never seen anyone on the boards list them in their mods but they say they are fluid dampened which I never heard anyone else claim. One of the little talked about about functions of a crank pulley(actually harmonic balancer) is to absorb some of the vibration of the crankshaft and give longer crank/bearing life. I have heard this is actually very critical on some engines (certain Hondas for instance) and they are tuned by the manufacterer and should not be changed. I know LS1's are internally balanced so that is not a factor but am wondering if there is any downside on our motors other than the obvious. I need to know if there are any "pulley/ balancer gurus" to answer this out there before my H/C swap next month? Now if I can only decide on a H/C combo too! lol
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Old Jan 26, 2008 | 08:19 PM
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Id just get a powerbond, you can just walk over and get one. LOL we have them on sale for 179

summit your be like 12-15 in shipping.
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Old Jan 26, 2008 | 09:03 PM
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I have one and see no reason to buy any other brand for more money. SFI and 25 percent. Looks good and is a quality piece.
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Old Jan 27, 2008 | 05:15 PM
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thats a good price
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Old Jan 27, 2008 | 05:20 PM
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X2, if you decide to order let us know how it goes.

its a good price
from the picture it looks like it has high side walls like slp's balancer
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Old Jan 27, 2008 | 05:31 PM
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Nice find.
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Old Jan 27, 2008 | 06:08 PM
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Originally Posted by studderin
Id just get a powerbond, you can just walk over and get one. LOL we have them on sale for 179

summit your be like 12-15 in shipping.
its actually 10.95 for shipping.
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Old Jan 27, 2008 | 06:18 PM
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I've had a March pulley for at least 5 years and 50k miles. No problems. My dyno guy gave me the option of March or SLP and I opted for the March.
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Old Jan 27, 2008 | 09:21 PM
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I also have a march. No problems and it appears to be well made.
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