Unorthodox pulleys
12-19-2002, 10:10 PM
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Unorthodox pulleys
I spoke with a rep from this company yesterday and asked him about the circulating advise against replacing the S crank pulley with a lighter one and I know that he sells them and possibly would say something like this but he did say that it was an " Urban Myth" and that replacing it would not harm the car at all.
Any input on this?
Any input on this?
12-20-2002, 07:09 AM
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Originally posted by AJ PwR
Replacing the crank pulley sure does increase power but at the same time it will upset the balance of the engine.
Replacing the crank pulley sure does increase power but at the same time it will upset the balance of the engine.
12-21-2002, 07:46 PM
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Doesn't the Comptech weld an additional pulley onto the stock unit?
If a crank pulley has a rubber ring damper or a true harmonic balancer, it should not be replaced with a pulley that does not have one. I don't even know if the S2000 has a rubber damper ring design, so check it out and see.
Anecdotal story - some of the top all motor Honda racers were pushing the limits on rpm for a B-series engine. The engines would live at 10k+ rpm, but not for long, even though they were fully blueprinted and balanced internally. Going from the Honda crank pulley (with rubber damper ring) to a true fluidamper setup smoothed the engine out and increased bottom end life substantially. Why anyone would want to go the opposite direction on a 9000 rpm engine is beyond me.
Caveat Emptor - and check out the problems some of the 3rd gen Mitsu Eclipse and Dodge folks have had with undamped underdrive pulleys. Also visit the Dinan website and go to tech articles and read their opinion (with useful technical info as well).
UL
[QUOTE]Originally posted by Wesmaster
[B]
If this is true, then explain the Comptech SC.
If a crank pulley has a rubber ring damper or a true harmonic balancer, it should not be replaced with a pulley that does not have one. I don't even know if the S2000 has a rubber damper ring design, so check it out and see.
Anecdotal story - some of the top all motor Honda racers were pushing the limits on rpm for a B-series engine. The engines would live at 10k+ rpm, but not for long, even though they were fully blueprinted and balanced internally. Going from the Honda crank pulley (with rubber damper ring) to a true fluidamper setup smoothed the engine out and increased bottom end life substantially. Why anyone would want to go the opposite direction on a 9000 rpm engine is beyond me.
Caveat Emptor - and check out the problems some of the 3rd gen Mitsu Eclipse and Dodge folks have had with undamped underdrive pulleys. Also visit the Dinan website and go to tech articles and read their opinion (with useful technical info as well).
UL
[QUOTE]Originally posted by Wesmaster
[B]
If this is true, then explain the Comptech SC.
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