Stillen Crank Pulley
09-14-2008, 07:19 PM
#241
Registered User
The water pump is driven by a belt from the crank, if you're not damping the torsional resonance, then it will transmit to anything also driven by the belt. It might be more of an issue on some cars than others. And it's not something an aftermarket company has any way of testing. Not even the big boys like Edelbrock or HKS have the kind of R&D budgets that an OEM has, nor do they have the knowledge.
Why do you think brands like Koenigsegg, Panoz, etc. use motors from MBZ, BMW or other big OEM companies?
Why do you think brands like Koenigsegg, Panoz, etc. use motors from MBZ, BMW or other big OEM companies?
bingo. and using a different size pulley in lieu of a stock size pulley is a means of underdriving (like aem pullies)
http://www.aempower.com/ViewCategory...CategoryID=108
...it has nothing to do with the harmonic dampening characteristics of the pulley.
as for the VQ, I have never heard of "smaller" pullies being an issue (maybe pulley issues on s/c cars like the stillen or vortech). only the sleeve portion of the crank pulley being too soft that it caused oil to leak at the crank (which again was a quick fix with a sleeve).
Buddy,
just go to newcelica.org...type a search for crank pullies and see how "favorable" they are. i remember key member of that site getting hosed because it was so difficult getting good n/a bolt on mods on the 2zz.
09-14-2008, 07:25 PM
#242
Registered User
Damn, I must be getting old, because after searching for some of those crank pulley threads on newcelica, I saw that I actually posted on some of them. Haha, don't even remember that:
http://www.newcelica.org/forums/show...northodox+pump
http://www.newcelica.org/forums/show...northodox+pump
http://www.newcelica.org/forums/show...northodox+pump
http://www.newcelica.org/forums/show...northodox+pump
wow....old memories...up to this day UR has not held any responsibility for people's engine failures, even when all the damage was consistent and all of them had UR pullies. i believe 6speed and Illusive were the 2 guys who ran their celicas to the 13s n/a.
09-14-2008, 07:55 PM
#243
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I think the issue is NOT the size of the pulley, but whether our stock pulleys have a "harmonic damper" that absorbs harmful vibrations. If it does, then buying a lighter aftermarket pulley without one will be a problem, regardless of whether the aftermarket one is the same size as stock. But that's what I'm wondering. Who would really know whether the VHR engine's stock pulley has a damper designed to absorb harmful vibrations or not?
09-15-2008, 05:13 PM
#244
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It's not vehicle specific though, torsional resonance is something that all piston based motors have. Some are worse than others and need more damping, while some may need less. Some have that resonance resolved through balance shafts like the 4G63. The motor in question though does come with a damper, so I wouldn't recommend replacing it with something that doesn't have damping material of some sort.
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