alternator R.I.P.
here we go again... the pulley debate has been covered over and over again it so i wont go into arguments with you...
udp has never been the problem in the failure of my alternator the direct source of the problem was the alternator voltage regulator wich is exposed to constant water directly from the vent of the carbon fiber hood wih is been solved with a cover im fabricating for the alternator.. give it a rest on the udp's on our engine even with a udp the internals are kept in full balance....
udp has never been the problem in the failure of my alternator the direct source of the problem was the alternator voltage regulator wich is exposed to constant water directly from the vent of the carbon fiber hood wih is been solved with a cover im fabricating for the alternator.. give it a rest on the udp's on our engine even with a udp the internals are kept in full balance....
Last edited by PR_Mivec; May 5, 2006 at 04:10 PM.
I understand fully that you have isolated the problem and the cause in your situation, I just want to make sure nobody else gets confused on this issue.
Aside from the debate about the UDP having negative effects on the engine there seems to be some confusion on the effects it should have on the other components of the engine.
Negative Effect
Since the overall diameter is decreasing (hence underdrive) the rest of the pulleys will turn at a slower rate than normal. Because of this your other pulley driven components will not perform at the factory level (charging, cooling, and steering will all suffer slightly at idle)
Positive Effect
With less belt revolution per engine revolution (due to the UDP) you should see an increase in the average lifetime of components on cars with the UDP when compared to cars without the UDP. This would indicate an indirect correlation however, since components fail for more reasons than just the number of revolutions the attached pulley has made.
If you wanted to counter-act the negative effects of the UDP but still wanted to lose some inertia on the crankshaft you can try finding pulleys for your components, which don't need any dampening at all, that are lighter and larger in diameter.
In summary, it can't cause bearing failure because the system is now moving at a slower speed than stock, and since the belt flexes there won't be any additional vibration from losing the harmonic balancer on the other components. Component performance will suffer mainly at idle, imperceptibly while driving. Physical wear will be less because of the slower system speed at idle, and at normal driving speeds the difference will be negligible between the UDP and stock system speeds.
I hope this will clear up any confusion about the UDP causing premature failure of an alternator, a/c compressor, or power steering pump.
Aside from the debate about the UDP having negative effects on the engine there seems to be some confusion on the effects it should have on the other components of the engine.
Negative Effect
Since the overall diameter is decreasing (hence underdrive) the rest of the pulleys will turn at a slower rate than normal. Because of this your other pulley driven components will not perform at the factory level (charging, cooling, and steering will all suffer slightly at idle)
Positive Effect
With less belt revolution per engine revolution (due to the UDP) you should see an increase in the average lifetime of components on cars with the UDP when compared to cars without the UDP. This would indicate an indirect correlation however, since components fail for more reasons than just the number of revolutions the attached pulley has made.
If you wanted to counter-act the negative effects of the UDP but still wanted to lose some inertia on the crankshaft you can try finding pulleys for your components, which don't need any dampening at all, that are lighter and larger in diameter.
In summary, it can't cause bearing failure because the system is now moving at a slower speed than stock, and since the belt flexes there won't be any additional vibration from losing the harmonic balancer on the other components. Component performance will suffer mainly at idle, imperceptibly while driving. Physical wear will be less because of the slower system speed at idle, and at normal driving speeds the difference will be negligible between the UDP and stock system speeds.
I hope this will clear up any confusion about the UDP causing premature failure of an alternator, a/c compressor, or power steering pump.
i have the open evo hood to ......i was at the local hardware store and found an aluminum pott that doesn't look to ugly , i'm going to cut it in half and try to mount it to cover the alternator .....to prevent apparently the inevitable (sp?) i'll let you know how it goes......
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