Poly motor mounts...
Thread Starter
Race Director
Joined: Mar 2001
Posts: 11,601
Likes: 0
From: San Francisco CA
St. Jude Donor '07
Poly motor mounts...
I tracked down the scraping under hard acceleration to the fan hitting the shroud, so sounds like the mount is toast (I'll check tomorrow to be sure). I've been doing some searching and poly for the driver's side seems to be a good idea. Solid mount sounds a little too hard core, especially for the L48. I'm looking for brand recommendations and maybe an explanation on locking/non-locking mounts.
TIA
TIA
Race Director
Joined: Nov 1999
Posts: 10,643
Likes: 8
From: Foxfield CO 1970 Convertible
As far as I know, the interlocking mounts contain metal "fingers" that will prevent the plate part on the engine from completely separating from the part on the frame should the rubber/poly break due to engine movement. You can't tell just by looking - the interlock is within the rubber portion. I bought some fairly decent US made mounts at Auto Zone... 
Drifting
Joined: Dec 2004
Posts: 1,321
Likes: 0
From: Edgewater (20 miles south of Daytona) Florida
Go with Energy Suspensions poly mounts. for your motor they will be great and look good too. I'm sure that scrape you hear IS the fan and shroud due to a broken mount. Yes, the metal interlocks were developed to prevent engine lift, throttle bind open on cars. Only way to go if you go stock rubber, but don't. Technology is much improved now and poly is the best (short of solid) insurance. 
Oh, by the way, you may want to install a tunbuckel from the frame to the motor in the future if you really start hammerin on the drivetrain. There are some really nice ones in stainless steel on the market. It use to be a piece of chain, but that was a long time ago.
Last edited by Glenn"Mr.Blue"Smith; Jul 20, 2005 at 08:32 AM.
Race Director
Joined: Mar 2001
Posts: 11,322
Likes: 1
From: Living in the Hartland
Most times just the driver side mount will fail, even with a locking one the eng lifts up, mine did. I just bought one poly mount at AutoZone and put that on the driver side, eng barely moves compared to what it used to with 2 rubber mounts.
Le Mans Master
Joined: Apr 2001
Posts: 5,941
Likes: 281
From: Was New Orleans but swam to Baton Rouge LA
Cruise-In IX Veteran
Energy suspension is what I used when I placed the Zz4 in my 71. I have had the car this way for about 3 years now and everything is great.
Tech Contributor
Joined: Aug 1999
Posts: 15,154
Likes: 3,959
From: Connecticut, USA
I last used ES motor mounts but not their trany mount- it was too tall. I had to go to a poly tranny mount from Prothane that either Summit or Jegs sells to get the correct one.
Gary
Gary
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
Melting Slicks
Joined: Oct 1999
Posts: 2,581
Likes: 14
From: Tolar Texas
Originally Posted by Fevre
...I just bought one poly mount at AutoZone and put that on the driver side,...
