Underdrive users & installers
Thread Starter
Melting Slicks
Joined: Jun 2005
Posts: 2,396
Likes: 52
From: Sicamous BC
Underdrive users & installers
I recently installed ASP underdrive, since then horrible noises are coming from the AC belt, checked the tensioner bearings & have a tried a slightly shorter new belt. From the underside I can visually see the align is incorrect between the compressor & the pulley. With the stock pulley the belt contact area on the compressor is much less that's why I'm sure there is no noise problem with stock pulley. It does not look like there is any way to change the AC compressor alignment, has any member out there experienced this issue?
Pro
Joined: Aug 2002
Posts: 693
Likes: 59
From: Freeburg IL
Cruise-In IX Veteran
Sounds like you didn't get the balancer all the way seated. Since the compressor is so close it would be most noticable there. Did the bolt torque to all way when you installed it?
Thread Starter
Melting Slicks
Joined: Jun 2005
Posts: 2,396
Likes: 52
From: Sicamous BC
The pulley is on correctly, as the main belt lines up perfectly. The visual problem is the belt wanting to walk towards the rad. Why, because the AC pulley is not parallel to the underdrive, the reason it is not a problem with the larger pulley is because the belt does not wrap as far around the compressor pulley. The more the belt follows the groves the more it will aggravate the alignment.
By the way I fabricated a proper pulley installation tool to insure that it did seat correctly.
By the way I fabricated a proper pulley installation tool to insure that it did seat correctly.
Last edited by CTD; Oct 24, 2008 at 12:58 PM.
Race Director
Joined: Oct 2002
Posts: 16,477
Likes: 26
From: Gone
CI 6-7-8-9-10 Veteran
St. Jude Donor '03
Did you buy the pulley new or used? Know the ASP part#?
The LS1 F-bpdy and GTO pulleys will fit the crank, but are different in that the belts are spaced out from the engine about 3/4" more on those cars compared to the Vette-specific pulley. If you bought one used, might have gotten the wrong one.
The LS1 F-bpdy and GTO pulleys will fit the crank, but are different in that the belts are spaced out from the engine about 3/4" more on those cars compared to the Vette-specific pulley. If you bought one used, might have gotten the wrong one.
