Is the idler bearing seizing up only an issue for people with the 185mm pulley?
10-26-2010, 01:16 PM
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C32 AMG
Is the idler bearing seizing up only an issue for people with the 185mm pulley?
The needswings pulley saver kit seems like the answer to the problem for the 185mm pulley kit, being that the idler pulley bearing seizes up, even with the new 19k rpm bearing. I was wondering if anyone else had problems with the idler bearing with the 178mm or 181mm pulley kits or if its just mostly the 185mm.
10-26-2010, 04:17 PM
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C32 AMG
So installing the needswings pulley saver kit at the same time that i get the crank pulley kit installed is basically the best option. And youre saying eventually, the eurocharged 19k rpm bearing will seize up regardless of if i have the 181 or 185?
10-26-2010, 04:17 PM
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2008 A8L, 2002 996TT X50, 2009 X5
It's not only limited to the 185mm CP kits... my LET 181mm kit idler seized. That was before the 19k rpm bearing though.
10-26-2010, 05:00 PM
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But even without an aftermarket pulley, the OEM idler pulley can possibly seize.
10-26-2010, 06:46 PM
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The needswings pulley saver kit seems like the answer to the problem for the 185mm pulley kit, being that the idler pulley bearing seizes up, even with the new 19k rpm bearing. I was wondering if anyone else had problems with the idler bearing with the 178mm or 181mm pulley kits or if its just mostly the 185mm.
AFAIK, haven't heard of that problem with the Code 3 SC pulley.
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10-26-2010, 08:15 PM
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2003 porsche 996 turbo
had 3 idlers go bad on my 32 with and without my c3. installed a c3 psk and no more issues!!
the concept of the psk is to slow down the idlers by going 10mm larger on the pulleys and changing the location of the upper idler. using a larger belt it ties the whole system together and allows you to get replacement paerts at napa instead of m/b. the relocation of the upper idler also gives a better belt wrap on the s/c pulley which helps belt slip
the concept of the psk is to slow down the idlers by going 10mm larger on the pulleys and changing the location of the upper idler. using a larger belt it ties the whole system together and allows you to get replacement paerts at napa instead of m/b. the relocation of the upper idler also gives a better belt wrap on the s/c pulley which helps belt slip
10-27-2010, 02:57 AM
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Good question. I was wondering the same... If you have a smaller supercharger pulley it certainly will not. However, with a larger crank pulley will it? Does the larger crank rotate every pulley faster based on it's size, or is it all pulleys combined and belt length that determines the rotational speed of each individual pulley? Actually I guess if that's the case it would do the same on smaller supercharger pulley...
Last edited by gt4awd; 10-27-2010 at 03:33 AM.
10-27-2010, 06:22 AM
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2008 A8L, 2002 996TT X50, 2009 X5
Good question. I was wondering the same... If you have a smaller supercharger pulley it certainly will not. However, with a larger crank pulley will it? Does the larger crank rotate every pulley faster based on it's size, or is it all pulleys combined and belt length that determines the rotational speed of each individual pulley? Actually I guess if that's the case it would do the same on smaller supercharger pulley...
Jordan7589, I don't think the PSK would have any measurable effect on engine output. The pulleys swapped out are just guides AFAIK, it doesn't under or over-drive any pulleys that are powering accessories any more than the regular 178, 181, or 185mm kits are already doing - so no net changes there.
The new guide pulleys and belt might have slightly more mass (and be slightly more difficult to move - i.e. cause a bit more parasitic loss), but allegedly the arrangement also causes slightly better belt wrap on the S/C pulley - a known area to experience slip with modded M112Ks. And I don't even know that they have more mass than the pulleys they replace - might be the same or less. Either way, I doubt it would even amount to 1/2 a HP difference. Rounding error at that point.
10-27-2010, 10:13 AM
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C32 '02
The crank-pulley is the "driver" of the whole system, so each supplemental pulley's rotational speed is calculated by the ratio of crank pulley : accessory pulley. So if you have a 185mm crank and a 92.5mm accessory pulley, 1 rotation of the crank (i.e. one engine revolution), the crank pulley rotates once, but the accessory pulley rotates twice. Assuming no seized bearings or belt slip, of course.
Jordan7589, I don't think the PSK would have any measurable effect on engine output. The pulleys swapped out are just guides AFAIK, it doesn't under or over-drive any pulleys that are powering accessories any more than the regular 178, 181, or 185mm kits are already doing - so no net changes there.
The new guide pulleys and belt might have slightly more mass (and be slightly more difficult to move - i.e. cause a bit more parasitic loss), but allegedly the arrangement also causes slightly better belt wrap on the S/C pulley - a known area to experience slip with modded M112Ks. And I don't even know that they have more mass than the pulleys they replace - might be the same or less. Either way, I doubt it would even amount to 1/2 a HP difference. Rounding error at that point.
Jordan7589, I don't think the PSK would have any measurable effect on engine output. The pulleys swapped out are just guides AFAIK, it doesn't under or over-drive any pulleys that are powering accessories any more than the regular 178, 181, or 185mm kits are already doing - so no net changes there.
The new guide pulleys and belt might have slightly more mass (and be slightly more difficult to move - i.e. cause a bit more parasitic loss), but allegedly the arrangement also causes slightly better belt wrap on the S/C pulley - a known area to experience slip with modded M112Ks. And I don't even know that they have more mass than the pulleys they replace - might be the same or less. Either way, I doubt it would even amount to 1/2 a HP difference. Rounding error at that point.
10-27-2010, 11:24 AM
#13
