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Thread: Gspec/UR crank pulley - reliability issues?

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Posts: 21-24 of 24
2009-06-03 08:36:25
#21
Originally Posted by cory
ive been running a 4crw and gregv pulley since they came out and it hits 8.5-9k pretty much daily... no issues


^^^ That's what I like to hear
2009-06-03 11:34:30
#22
I'll point out, the high revs aren't necessarily the problem. There is an rpm or a few rpm that the crank will resonate at, so if you hold the rpm there eventually you will do some damage. That could be 3k and 6k and 9k rpm or it might be 4.5k and 9k rpm or maybe 8k and 16k rpm. I don't know... Point is, it's not the high revs that are the problem, it's sustained duration at the resonant rpm that is the problem. And sustained rpm at the highest multiple you can reach (if it resonates at 3k, 6k and 9k then hanging out at 9k is worse than hanging out at 3k).

It would appear that 99.999% of people's driving habits just don't have them holding the engine at the resonant rpm for very long so no one seems to have an issue. I don't see why anyone here on this forum would be significantly different in their driving style as to make this a problem for them.
2009-06-03 12:06:10
#23
so how do you measure where the resonance point/s is/are?

I predominantly cruise at 120-150km/h which is about 3500-4000rpm, and other than that when I'm having fun I run through the gears quickly, so the motor doesn't sit at any particular rpm for more than a few split seconds. So yes, it seems unlikely that you'll ever really be sitting at one of the resonance points for a significant period of time. Well, at least in my case (and unless that point is 3-4k)
2009-06-03 12:29:21
#24
Originally Posted by Doctor
so how do you measure where the resonance point/s is/are?
Apparently it's a very complicated process that not many people understand very well, nor do they have the equipment. You're not going to do it that's for sure. Neither am I.

Originally Posted by Doctor
it seems unlikely that you'll ever really be sitting at one of the resonance points for a significant period of time. Well, at least in my case (and unless that point is 3-4k)
And from the sheer numbers of people running around with no harmonic balancer who no doubt cruise at 3-4k we can safely assume the crank doesn't resonate at those rpm.
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