Caution on Underdrive Crank Pulleys
My stock pulley is sitting on my kitchen table 
, so I'll be able to tell once I get home from work. IIRC, though, I think it had a -thin- rubber layer between two heavy metal pieces.
EDIT: If you look close, you can see what I believe is a layer of rubber on the stock pulley.
, so I'll be able to tell once I get home from work. IIRC, though, I think it had a -thin- rubber layer between two heavy metal pieces.EDIT: If you look close, you can see what I believe is a layer of rubber on the stock pulley.
Last edited by Myszkewicz; Oct 12, 2005 at 02:42 PM.
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From: where the 2005 World Series Champions play
yeah there might be engine wear once you crack it open, but that doesn't matter as of yet. that is a ton of hearsay. what is important is if that enigne is not working well right now or in the future. the fact is he has had it on for 80k+ of hard driving on an evo with 100whp more then stock and has had no problems and has had no symptoms of problems either. i have not read about any evo having problems as i have researched this for hours and talked to about a dozen evo drivers with pulleys from anwhere to 500-80k miles with the pulley. none have had the slightest problem. the vendors and tuners i talked to about this just said they stick wiith the stock stuff and won't even talk about any options. all of their doubts are based off of the fact that they don't make one, what others cars have experienced, and what they believe to be logical. for evos its a 20 min install. i think strappin it on for the track and meets would be completely fine, so you are only using it maybe 100 miles/yr. why wouldn't an engine dampener help stop the vibrations and premature engine wear?
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Thats what I'm saying, You can change the part out as bout as fast as you could change a full set of tires once you've done it once. I'm saying that its a fantastic option for the track but if you know you're gonna be doing nothing but commuting, IE. winter, It might be advisable to take it off until you really need it.
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From: Yucaipa, CA (So. Ca.)
Originally Posted by TylerO@WORKS
It's a big no-no on hondas. I really don't think it is worth it any risk.
-Joe
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I had a Unorthodox Racing Underdrive Lightweight Crank Pully (has no harmonic dampener) on my old Talon and had put probably around 40K miles on it with no problems what so ever. This is on a 15 year old car and motor with 200K+ miles that has never been rebuilt and still runs mid 12's! 
Last edited by Good_Enough; Oct 12, 2005 at 05:10 PM.
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From: Okanagan, BC, Canada
Originally Posted by Redcloud
OK. I have 103K miles on my 2003 EVO VIII. I'm putting down about 330(AWHP) I have been running an underdrive pulley since I was at about 30K miles. I have had ZERO issues and don't plan to remove the pulley anytime soon. You need to research balance shafts!
The only thing you have to worry about when using an underdrive pulley is overheating at idle due to the water pump not turning fast enough to keep the engine cool, and that is just in improper applications when the crank pulley is to small for the engine.
I am not an engine builder but my step-dad builds NASCAR Engines and they use underdrive pulleys too. I know that is a different application but he did tell me that as long as the engine stays cool at idle and the battery is charging properly you are good. (This is simplifing his statement as it was pretty technical for me)
I think it all comes down to using a quality pulley that was CAD designed for your engine application not just half-assed fabricated in some "race shop".
I have this pulley:
The only thing you have to worry about when using an underdrive pulley is overheating at idle due to the water pump not turning fast enough to keep the engine cool, and that is just in improper applications when the crank pulley is to small for the engine.
I am not an engine builder but my step-dad builds NASCAR Engines and they use underdrive pulleys too. I know that is a different application but he did tell me that as long as the engine stays cool at idle and the battery is charging properly you are good. (This is simplifing his statement as it was pretty technical for me)
I think it all comes down to using a quality pulley that was CAD designed for your engine application not just half-assed fabricated in some "race shop".
I have this pulley:
I have heard a lot of talk about engine WEAR, but not a lot about engine failure. To be totally honest i could care less about engine wear as long as the motor runs ok. If i can put the pulleys on and drive my car for 80K miles and it still cranks/runs when I trade it in then I am just fine. When you trade or sell your car they dont open up the engine to check for wear and tear. All they do is drive the car and look for obvious problems.
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Originally Posted by NonEvo
I have heard a lot of talk about engine WEAR, but not a lot about engine failure. To be totally honest i could care less about engine wear as long as the motor runs ok. If i can put the pulleys on and drive my car for 80K miles and it still cranks/runs when I trade it in then I am just fine. When you trade or sell your car they dont open up the engine to check for wear and tear. All they do is drive the car and look for obvious problems.
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I'm not saying I won't get one nor will I discourage other people from getting them. I'm gonna have this car for 4+ years and I do put considerable milage on it so I am worried as I expect to put 130K+ on the car.
I would say that it will be more dangerous for your car if you add the RRM turbo. NA, you might be fine. Its hard to say.
I would say that it will be more dangerous for your car if you add the RRM turbo. NA, you might be fine. Its hard to say.
AEM says on their website they do not offer crank pulleys
Originally Posted by ROCK
If these pulleys were such trouble. A company like AEM would have been out of business a long time ago. I think this is a lot of worry for nothing.
ROAD/RACE
ROAD/RACE
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Also, better to be safe than sorry... I don't think I could convince Mitsubishi to replace my engine under warranty of they saw that the crankshaft bearings where worn out after only 60,000miles...
But we still have not heard a definitive argument for or against this pulley. No one on here (and it does seem to include RRM) as the technical expertise to once and for all prove or disprove the theory that the pulley may put abnormal wear on the crankshaft itself of it's bearings.
What we need on here is less opinions and a more technical-oriented analysis.
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Also, better to be safe than sorry... I don't think I could convince Mitsubishi to replace my engine under warranty of they saw that the crankshaft bearings where worn out after only 60,000miles...
But we still have not heard a definitive argument for or against this pulley. No one on here (and it does seem to include RRM) as the technical expertise to once and for all prove or disprove the theory that the pulley may put abnormal wear on the crankshaft itself of it's bearings.
What we need on here is less opinions and a more technical-oriented analysis.
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