Removing Frisbee
Thread Starter
Drifting
Joined: Jul 2014
Posts: 1,426
Likes: 46
From: Lynchburg, VA
Per Gordon Killebrew at Carlisle in 2000: "During testing of the new A/C compressor on the '88 Vette GM noticed an occasional "squeal" when the compressor engaged so they added the "frisbee" to dampen out sudden pull on the serp." "Removing the "frisbee" will release ~10chp from parasitic drag".
I have verified the 10chp gain by trap speed increase of 1mph, corrected for DA.
In 2000 I immediately removed the "frisbee" from my prior '88 and three years ago removed it from this '88 and never had even a squeal from the belt.
The '88 & '89 "frisbee" is a uniform thickness 10lb disk so thick lock washers are advised under the bolt heads. The '90 & '91 units are much thinner with mass concentrated in the outer rim so washers may not be needed.
I have verified the 10chp gain by trap speed increase of 1mph, corrected for DA.
In 2000 I immediately removed the "frisbee" from my prior '88 and three years ago removed it from this '88 and never had even a squeal from the belt.
The '88 & '89 "frisbee" is a uniform thickness 10lb disk so thick lock washers are advised under the bolt heads. The '90 & '91 units are much thinner with mass concentrated in the outer rim so washers may not be needed.
10 CHP seems like a lot for such a light disk...
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
10 CHP seems like a lot for such a light disk...
And it is this rotary inertia that sucks up the 10chp that came from the new (in '88) D-port heads.
Drifting
Joined: Dec 2011
Posts: 1,439
Likes: 23
From: mesa az
I removed mine when the engine was being rebuilt and was stripped to the bare block. Zero issues. As far as it being a benefit goes, taking a 10lb steel plate off the water pump pulley is a no brainer. I can remember all of us LAUGHING at this metal plate when we were passing it around.
Team Owner
Joined: May 2000
Posts: 53,776
Likes: 5,623
From: Plantation Florida USAF(Retired) 1966-1990
U.S. Air Force
St. Jude Donor '05 thru '26
NCM Sinkhole Donor
I removed that weight 13 years ago, with noticing no difference in HP or belt squeal.
There was the reason but my car at no concerns.
There was the reason but my car at no concerns.
2nd Gear
Joined: Sep 2023
Posts: 2
Likes: 0
Issues with removing the frisbee??
I read up that not having the Fresbee, the water pump pulley may not have the damping effect that was intended to smooth out those load changes from the A/C compressor cycling. This could cause more vibration to be passed through the drivetrain and into the cabin.
I feel a lot of vibrations in my shift ****, but only when I turn my AC on and go above 3k RPMs.
Could this be my problem?
I feel a lot of vibrations in my shift ****, but only when I turn my AC on and go above 3k RPMs.
Could this be my problem?
