ASP UD Pulley Install - Slight Vibration
Thread Starter
Teching In
Joined: Dec 2004
Posts: 6
Likes: 0
ASP UD Pulley Install - Slight Vibration Along with Cam and Heads I just installed an ASP UD Pulley on a 98 Corvette. As there is no key the pulley was first pressed on with a Balancer installer then the old bolt was torqued to 240ftlbs. A new bolt was then installed at 37ftlbs followed by a 140 degree turn. All as per the service manual.
The car runs incredible and pulls like crazy. But between 1500 to 2500rpm there is a very very slight vibration felt both in gear and in park. It's barely noticeable but wanted to check. Has anyone else ever experienced anything like this? I see no visable wobble in the pulley. If there was a problem with the cam I would think I would feel it at all rpm's.
Thanks
The car runs incredible and pulls like crazy. But between 1500 to 2500rpm there is a very very slight vibration felt both in gear and in park. It's barely noticeable but wanted to check. Has anyone else ever experienced anything like this? I see no visable wobble in the pulley. If there was a problem with the cam I would think I would feel it at all rpm's.
Thanks
Originally Posted by vettenut
Along with Cam and Heads I just installed an ASP UD Pulley on a 98 Corvette. As there is no key the pulley was first pressed on with a Balancer installer then the old bolt was torqued to 240ftlbs. A new bolt was then installed at 37ftlbs followed by a 140 degree turn. All as per the service manual.
The car runs incredible and pulls like crazy. But between 1500 to 2500rpm there is a very very slight vibration felt both in gear and in park. It's barely noticeable but wanted to check. Has anyone else ever experienced anything like this? I see no visable wobble in the pulley. If there was a problem with the cam I would think I would feel it at all rpm's.
Thanks
The car runs incredible and pulls like crazy. But between 1500 to 2500rpm there is a very very slight vibration felt both in gear and in park. It's barely noticeable but wanted to check. Has anyone else ever experienced anything like this? I see no visable wobble in the pulley. If there was a problem with the cam I would think I would feel it at all rpm's.
Thanks
Teching In
Joined: Aug 2004
Posts: 38
Likes: 0
I remember the old 1987-era Mustangs had a certain factory cam that pulled hard, then in 1989? I think it was they went to a slightly gentler cam --- all because at a certain rpm there would be unstable harmonics set up in the engine = vibration. funny thing was, I think the rpm value was like 5858 rpm or something pretty high,a stock 5.0 was way past useful at that point[stock heads , exhaust].
As long as the pulley is on far enough, I can't see how that would be the problem. The gap on the LS1 I think should be 0.125" from the seal lip, [I think].
Mike
As long as the pulley is on far enough, I can't see how that would be the problem. The gap on the LS1 I think should be 0.125" from the seal lip, [I think].
Mike
