Solid Motor Mounts
Thread Starter
Racer
Joined: May 2006
Posts: 423
Likes: 3
From: New Port Richey, FL
Solid Motor Mounts
Does anybody use them? I have them in mine and it shakes the car but I do run a Comp XE274S cam. I was thinking of switching to a poly mount- anybody run those, and how much of a differance does it make over standard rubber mounts? I can live with the solids, I just know that the women love it, because they tell me that feels just like a Harley. Thanks
Race Director
Joined: Jan 2000
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From: Corsicana, Tx
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I've got solids in mine, I'm sure there is some vibration...but I don't notice it. I ran stock interlocking style for years with no issue either. Take your pic.
JIM
JIM
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Race Director
Joined: Nov 2006
Posts: 19,445
Likes: 349
From: Athens GA
St. Jude Donor '12-'13, '15- '16-'17-'18-'19, '21
Does anybody use them? I have them in mine and it shakes the car but I do run a Comp XE274S cam. I was thinking of switching to a poly mount- anybody run those, and how much of a differance does it make over standard rubber mounts? I can live with the solids, I just know that the women love it, because they tell me that feels just like a Harley. Thanks
What have you got under your trans?
My setup is still a year away but I have solids for the front and rubber for the trans.
Bman
Melting Slicks
Joined: Mar 2002
Posts: 2,164
Likes: 7
From: Beringen
Ok, let's talk about this a little.
Some here say it stiffens up the front. I believe that. However the forces have to go somewhere and where do they go to ? Yes, into the engine. Now, you may think the engine block is an incredibly strong piece of steel right ? Wrong, hence the reason why they use torque plates to hone them. If you use solid mounts, the engine will deform, although minute, causing less sealing of the rings.
The standard oil pumps today have smaller mounts. Take a look at the website of the manufacturers. They advice against using a standard pump when using solid mounts...not without reason.
As for poly : I've seen it crack and break. It doesn't help you with the engine movement. If you plan on a poly mount, you can just as well go to a solid one.
Just my opinion on things. Your call.
Some here say it stiffens up the front. I believe that. However the forces have to go somewhere and where do they go to ? Yes, into the engine. Now, you may think the engine block is an incredibly strong piece of steel right ? Wrong, hence the reason why they use torque plates to hone them. If you use solid mounts, the engine will deform, although minute, causing less sealing of the rings.
The standard oil pumps today have smaller mounts. Take a look at the website of the manufacturers. They advice against using a standard pump when using solid mounts...not without reason.
As for poly : I've seen it crack and break. It doesn't help you with the engine movement. If you plan on a poly mount, you can just as well go to a solid one.
Just my opinion on things. Your call.
Le Mans Master
Joined: Jan 2006
Posts: 6,489
Likes: 134
From: Butler Pa
Melting Slicks
Joined: Dec 2009
Posts: 3,164
Likes: 623
From: Thunder Bay
I have poly mounts in my '79. I put them in thinking they would be stronger after I broke a rubber mount. They definietely transmit more vibration to the cockpit. I later read that they are no stronger than rubber, so I added a cable to keep the engine in place. Next time I have the engine out, I'm going back to rubber. If the solid mounts transmit more vibration than the poly, I wouldn't use them, but that's a personal taste thing. Lots of guys like to feel every vibe and hear all the engine noise they can as part of the Corvette experience. I'm too old for that. 
Race Director
Joined: Nov 2006
Posts: 19,445
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From: Athens GA
St. Jude Donor '12-'13, '15- '16-'17-'18-'19, '21
Back in the day (late 60's) we would beef up our engines only to break the left (driver's side) motor mount. You knew it when the fan started hitting the shroud.
More torque than the factory mount could handle.
So we replaced the mount with a new stock one but then added a homemade "torque strap". Mine was a big-azz turnbuckle from the frame to a extra head bolt bolted into the head from the side.
Instead of breaking the mount the left front tire lifted off the ground on hard launches.
Seems like solid mounts serve the same function.
Like I said - add a rubber mount under the trans.
imo
Bman
More torque than the factory mount could handle.
So we replaced the mount with a new stock one but then added a homemade "torque strap". Mine was a big-azz turnbuckle from the frame to a extra head bolt bolted into the head from the side.
Instead of breaking the mount the left front tire lifted off the ground on hard launches.
Seems like solid mounts serve the same function.
Like I said - add a rubber mount under the trans.
imo
Bman
Last edited by bmans vette; Apr 22, 2012 at 11:57 AM. Reason: typo
Le Mans Master
Joined: Jun 2004
Posts: 6,231
Likes: 65
From: Seattle WA
St. Jude Donor '14
Solid mounts make the engine to some extent a "stressed member" of the chassis. It does improve chassis stiffness...but on the street with all the flex of daily driving I would personally pass.
I've run polys on street engines with no issues at all, but that's just me.
Just one' guy's take.
I've run polys on street engines with no issues at all, but that's just me.
Just one' guy's take.
Race Director
Joined: Nov 2002
Posts: 12,142
Likes: 54
From: Taylor Michigan
Race cars use motor plates and the transmission is suspended........to use solid OE style mounts in a passenger car {and that's what a Vette is} will probably stress transmission mounts and at the least break tail-shafts..... other than that it might sound good while bench racing and have some possible bragging rights.....Other than these points, GM has used cables through the front mounts on the L-78 1967 Camaro engines......but nothing solid anywhere
Tech Contributor
Joined: Aug 1999
Posts: 14,336
Likes: 6,282
From: At my Bar drinking and wrenching in Lafayette Colorado
I've been running solid mounts for years with no issues. I don't notice any vibration in my big-cammed engines that's any worse than a stock mount. No broken parts. No problem with oil pump. No ring seal problem. No broken tranny tailshaft housing. No harmonics. None of the wive's tales about solid mounts. Only difference is that I'm not replacing ripped-out rubber mounts every 3 months...
Lars