Broken engine mount
Thread Starter
Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
Broken engine mount
I Know this has been covered many times but I feel it is worth bringing up again. The 77 I did over the winter came back yesterday for an oil change and some tweaks on the car. The owner said he heard some noise when accelerating above 4000 rpm and hard on the throttle. Some clunking when shifting at higher rpm. My immediate thought was engine mount. Looked at the fan shroud and evidence of the fan hitting the shroud. Put it up on the lift and this is what I saw. Sure enough the mount is toast. When I out the motor in this winter I looked at the mounts and they looked pretty new so I reused them. Mistake not replacing with urethane or solid mounts. The stock rubber mounts even though when new can’t hold up very well with a stick car and an aggressive driver. New poly mounts already on the way. I have broken mounts before so I should have known better. No major damage done. New mounts should be here tomorrow. All good. Just replace mounts anytime the motor is out so you don’t have to do this twice.
Le Mans Master
Joined: Jun 2019
Posts: 7,624
Likes: 2,455
From: Indiana
2 years ago i blew mine (assme original) and replaced with USA made rubber frm napa.. ymmv
10000 miles later , not granny driven, tuned 4 sp l82… holding up perfect
https://www.corvetteforum.com/forums...ce-79-l82.html
10000 miles later , not granny driven, tuned 4 sp l82… holding up perfect
https://www.corvetteforum.com/forums...ce-79-l82.html
Le Mans Master
Joined: Aug 2017
Posts: 8,336
Likes: 2,809
From: Cool Northern Michigan
There seems to be a myth and misconception about Solid Motor Mounts. People shy away for fear of a vibration up one arm and down the other from the wheel.
Nothing could be farther from the truth.
What does poly and rubber have in common for motor mounts? Both materials degrade over time. And in the small confines of Vette engine bay the heat speeds up the degradation. Solid steel is the only way to go. Never rots away.
Here are some tips about mounts:
Rubber in front, rubber at trans.
Steel in front, steel at trans.
Steel in front, rubber at trans
But NEVER-never-ever rubber in front steel at trans.
Nothing could be farther from the truth.
What does poly and rubber have in common for motor mounts? Both materials degrade over time. And in the small confines of Vette engine bay the heat speeds up the degradation. Solid steel is the only way to go. Never rots away.
Here are some tips about mounts:
Rubber in front, rubber at trans.
Steel in front, steel at trans.
Steel in front, rubber at trans
But NEVER-never-ever rubber in front steel at trans.
Tech Contributor
Joined: Aug 1999
Posts: 14,356
Likes: 6,328
From: At my Bar drinking and wrenching in Lafayette Colorado
After breaking multiple mounts of various types and brands, I went to Moroso solids and haven't had a single problem since. No adverse vibration or side effects. Just nice, reliable engine attachment to the frame.
Lars
Race Director
Joined: Jun 2000
Posts: 10,024
Likes: 658
From: FL
Instructor
Joined: Dec 2016
Posts: 119
Likes: 20
I had my mechanic a pr of factory style mounts from NAPA, and a pr of the poly (Energy Suspension) so he'd have two to fit. Then read ALL these posts where members here went to solid, not one that said any neg's (if you read outside this forum, you'd have to be an idiot to go with solid). So I just ordered Moroso's solid mounts for Monday delivery and hope my mechanic didn't decide to work any this w/e and put the others on.
Last edited by cador; Sep 24, 2022 at 09:03 PM.
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Le Mans Master
Joined: Jun 2019
Posts: 7,624
Likes: 2,455
From: Indiana
There may be a dose of application as well.
i don’t rhink rubber will hold up to much more than oem power. I figured they put rubber on for some reason and comfort is part of my decision and I don’t have big power.
Once we in a while i run silent as i can in rich corinthian leather
i don’t rhink rubber will hold up to much more than oem power. I figured they put rubber on for some reason and comfort is part of my decision and I don’t have big power
.Once we in a while i run silent as i can in rich corinthian leather
Le Mans Master
Joined: Apr 2011
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From: Hermosa
Is my vette stock?? HAHA
Joined: Oct 2015
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From: Im not allowed to tell you
2020 C3 of the Year Finalist - Modified
2020 Corvette of the Year Finalist (performance mods)
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No reason to run anything but solids on the motor and a poly on the trans. Ive broken all of the other styles and they arent cheap either
