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Motor Mount Problem

 
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Larry Epperson
Senior Contributor


Joined: 05 Dec 2006
Posts: 290
Location: Dallas

PostPosted: Sat Dec 15, 2018 8:53 pm    Post subject: Motor Mount Problem Reply with quote

I have had two failures on my motor mounts the latest coming after only 3000 miles. (Bowling Green Kentucky longest trip)
I have side motor brackets on my 57, Energy Suspension ENS-3.1114R motor mounts, 350 Engine and Patriot H-8025 exhaust headers. This is the same set up I installed 10 years ago.

I sent the latest set to Energy Suspension for a decision or what the problem is/was. The response was that the mounts were getting too HOT and I should install a heat shield to protect the polyurethane! They have 'melted' somewhat but shouldn't they work as installed?

I know there are several of you that are using these Patriot Headers and maybe even using the ENR mounts.
??Are you having the same problem? Maybe you should check your mounts
My exhaust heat should not be any hotter than anyone else.

Please give me your comments before I buy another set.
Thank You
Larry Epperson
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1957 Chevy BelAir
1949 Chevy Truck

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acardon
Senior Contributor


Joined: 12 Jul 2005
Posts: 264
Location: Southlake, Tx.

PostPosted: Sun Dec 16, 2018 3:16 pm    Post subject: Reply with quote

Larry, have you checked the header temps with a inferred temp gun? A rich mixture can cause them to get hotter than normal.
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David Graves
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Joined: 02 Jun 2005
Posts: 1314
Location: Warsaw, TX

PostPosted: Sun Dec 16, 2018 7:33 pm    Post subject: Reply with quote

rich mixture = hotter ???

with my dragster, lean gets it hot and will burn electrodes, rich will cool the combustion chamber ... ???

a quick Google search finds two results -

Most overheating issues related to air/fuel ratios are the result of a lean mixture, which causes the cylinders to run hotter.

A rich mixture will cause the vehicle to run hot. It will cause a clogging up off the catalyst resulting in the degradation of the honeycomb in it.

Bottom line - ? I have no clue other than my own experience with drag racing and lean gets the chamber hot ..
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Larry Epperson
Senior Contributor


Joined: 05 Dec 2006
Posts: 290
Location: Dallas

PostPosted: Sun Dec 16, 2018 8:49 pm    Post subject: Reply with quote

No, I haven’t checked the temp of headers and will need to check fuel/air mixture plus timing
Gives me some things to check out

Thank you and will give update. Right now no supports on to to the check. I can put the old ones in to check out or maybe go solid mounts which doesn’t correct the potential problem !
_________________
in my Garage:

1957 Chevy BelAir
1949 Chevy Truck

Thought for the day-

Horsepower: "If a little is great, and a lot is better, then way too much is just about right
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David Graves
Site Admin


Joined: 02 Jun 2005
Posts: 1314
Location: Warsaw, TX

PostPosted: Sun Dec 16, 2018 8:54 pm    Post subject: Reply with quote

Your problem is not unique .. there are several threads on forums about this issue .. and seems the fix is solid mounts or change headers, after making sure there isn't some extreme temperature thing going on ..

https://www.corvetteforum.com/forums/c3-tech-performance/2703448-poly-motor-mounts-melted.html
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In My Garage -
'56 Corvette
'55 Bel Air Hardtop
Blown 427 nostalgia front engine dragster
'15 Indian Chief Vintage


Last edited by David Graves on Sun Dec 16, 2018 9:02 pm; edited 1 time in total
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acardon
Senior Contributor


Joined: 12 Jul 2005
Posts: 264
Location: Southlake, Tx.

PostPosted: Sun Dec 16, 2018 8:55 pm    Post subject: Reply with quote

David's right, I had it backwards. Lean mixture can cause hot headers.
Have you tried rubber, I would think solid mounts would be noisy and vibrate the whole car. Can you put a shield between the header and mount?
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Larry Epperson
Senior Contributor


Joined: 05 Dec 2006
Posts: 290
Location: Dallas

PostPosted: Sun Dec 16, 2018 9:43 pm    Post subject: Reply with quote

I have a shield designed to fit between the poly mount and the backing plate with a ‘turn up’ about 2”. (5”x 8”) 22 ga sheet steel. Looks good and should work but still need to make any lean conditions. Changed needle rods/jets with rebuilt engine may need to go back to original or even richer. I bought a complete needle/jet kit for the Edelbrock Carb. Easy enough to do just takes a few minutes
_________________
in my Garage:

1957 Chevy BelAir
1949 Chevy Truck

Thought for the day-

Horsepower: "If a little is great, and a lot is better, then way too much is just about right
Back to top
View user's profile Send private message Send e-mail
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