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Old 03-08-2010, 04:20 AM   #1
Mojambo
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Member#: 102581
Join Date: Dec 2005
Chapter/Region: E. Canada
Location: Ottawa, Canada
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SGM

Default STU motor mount problem-suggestion inside

Hey guys,

I'm brining this up after reading it in the STU setup post. I feel more clarification is needed.

Rules:
J. Engine mounts may be replaced, but must attach in the factory
location(s) without additional modification or changes. Engine
position may not be changed. The volume of metal in a
replacement mount may not be increased relative to the volume
of metal found in a stock mount for the particular application.
Solid metal mounts are specifically prohibited. Any non-metallic
inserts may be used.

If you look at a stock mount, the metal is quite thick and covers a large area. The cusco's seem to have less steel. The key thing here is the ratio of metal to rubber. As long as the mounting is the same. the cusco has less rubber as well. According to the above, the ratio of metal to rubber can change, as long as there is not MORE metal in the replacement mount.

I'll find a way to quantify the volumes and ratios of both mounts.

But how about this. Hypothetically speaking, if the cusco mount does in fact have less metal, it would then comply.

I'm trying to think outside the box here as I don't want to replace more broken GroupN mounts.

What do you guys think.

does this rule apply to the tranny mount?

Thanks,

Eric
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Last edited by Mojambo; 03-08-2010 at 04:33 AM.
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Old 03-08-2010, 08:11 AM   #2
Scooby921
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Default

Considering the Cusco mounts have about 1/3 the rubber content and the same, if not more steel, I wouldn't waste your time investigating. They won't be legal.
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Old 03-08-2010, 04:52 PM   #3
subydude
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Group-N is the way to go for this. I had a set in the SM car for 3 years and they were still going strong when I upgraded to Cusco.
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Old 03-10-2010, 04:29 PM   #4
Mojambo
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SGM

Default

Looking for more clarification on this.

I sat down with the groupN and the cusco side by side. The cusco's are heavier and I think Scooby921 is right saying they have more metal.

My next question is 2 part.

1. Is the rule about a rubber to metal ratio?
2. if so, could one add rubber to the cusco until it had the same rubber:metal ratio.?

thanks

E
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Old 03-13-2010, 12:03 AM   #5
ritky
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The rule you posted says volume of metal in the new mount compared to stock mount. Nothing about rubber ratio or even weight. Think volume and only volume.
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Old 03-21-2010, 01:15 PM   #6
Lconquistador9
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Default

I never was able to do anything about this also. After breaking the stock 06 mounts, then 05 mounts, then a set of Group N mounts I said screw it and got the cusco ones just because I was tired of changing them.
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Old 03-21-2010, 04:38 PM   #7
shane86
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Quote:
Originally Posted by Lconquistador9 View Post
I never was able to do anything about this also. After breaking the stock 06 mounts, then 05 mounts, then a set of Group N mounts I said screw it and got the cusco ones just because I was tired of changing them.
You're breaking engine mounts with the stock turbo, running at stock boost?
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Old 03-21-2010, 11:23 PM   #8
Evil STI
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1.)Get this stuff...DO NOT use anything below 80A. Waste of time, money and effort.
2.)Remove mounts or start with new.
3.)Mix, pour, let cure.
4.)Install.
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