Motor Mounts Solid Drivers/Polly - Chevelle Tech
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post #1 of 15 (permalink) Old Apr 4th, 19, 9:48 AM Thread Starter
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Motor Mounts Solid Drivers/Polly

I am getting ready to in install a new big block street/strip 68 car and trying to decide on motor mounts... I purchased solid and poly after research here. Looks like many run the solid drivers and poly passenger. Trying to understand the theory or science as to why, and after looking back and trying to find out why I notice several posts about bad vibrations running solid anywhere... just trying to get some insight so I can feel confident I am making an educated decision.

Thanks!

Mike
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post #2 of 15 (permalink) Old Apr 4th, 19, 10:02 AM
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Re: Motor Mounts Solid Drivers/Polly

I have had solid mounts in my street car since the late 80's with some minor vibrations from time to time but it has not been a big deal.
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post #3 of 15 (permalink) Old Apr 4th, 19, 10:19 AM
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Re: Motor Mounts Solid Drivers/Polly

Iím guessing that vibration is somewhat dependent on how well your engine is balanced. I had solids in one car that had been installed by the guy I bought it from. The vibration was horrible. I switched to Poly and it helped quite a bit. These days I figure itís easy enough to change mounts so itís stock rubber for me in all applications.
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post #4 of 15 (permalink) Old Apr 4th, 19, 10:26 AM
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Re: Motor Mounts Solid Drivers/Polly

I run solid on driver side, stock mount on passenger side and stock on transmission. No vibrations whatsoever.

The reason is that when you step on the gas driver side extends and passenger side compresses. IMO having rubber on passenger side reduces the amount of vibration transmitted through the frame.
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post #5 of 15 (permalink) Old Apr 4th, 19, 10:31 AM
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Re: Motor Mounts Solid Drivers/Polly

Quote:
Originally Posted by Eddie K View Post
I run solid on driver side, stock mount on passenger side and stock on transmission. No vibrations whatsoever.

The reason is that when you step on the gas driver side extends and passenger side compresses. IMO having rubber on passenger side reduces the amount of vibration transmitted through the frame.
Iím running the same setup with the same results. No vibes here.
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post #6 of 15 (permalink) Old Apr 4th, 19, 10:48 AM
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Re: Motor Mounts Solid Drivers/Polly

I'm running 600 ft*lb of torque, twin disc clutch, 4.10 rear gears, and a manual trans; and when I run sticky tires at the track, I figured a steel motor mount on the driver's side was a good idea because of the shock load on the mount. If I didn't have a performance engine, I would probably run poly mounts. I do get some very slight vibration in certain gears, but it is very small.
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post #7 of 15 (permalink) Old Apr 4th, 19, 11:35 AM Thread Starter
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Re: Motor Mounts Solid Drivers/Polly

Quote:
Originally Posted by MarkP View Post
I'm running 600 ft*lb of torque, twin disc clutch, 4.10 rear gears, and a manual trans; and when I run sticky tires at the track, I figured a steel motor mount on the driver's side was a good idea because of the shock load on the mount. If I didn't have a performance engine, I would probably run poly mounts. I do get some very slight vibration in certain gears, but it is very small.
Thanks... With my motor at around 650tq I think I will stay with the solid divers and poly passenger. Like mentioned previously not the end of the world to change them out.
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post #8 of 15 (permalink) Old Apr 4th, 19, 11:36 AM
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Re: Motor Mounts Solid Drivers/Polly

Been using a solid on the drivers side and stock rubber on passenger side and on the transmission. Not a hint of vibration.And that's on 18+ years of drag racing and street driving my car.
And when I launch my car at the track,that gas pedal goes to the floor on the last yellow and my convertor flashes to 4,000
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post #9 of 15 (permalink) Old Apr 4th, 19, 12:00 PM
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Re: Motor Mounts Solid Drivers/Polly

Switching back to a solid drivers side myself. 600+ ft lbs and a clutch. PS I didnt notice any reduction in NVH when I swapped the poly one back in some years back. I thought it would be "softer" Nope. Same. So solid goes back in.
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post #10 of 15 (permalink) Old Apr 4th, 19, 1:29 PM
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Re: Motor Mounts Solid Drivers/Polly

Solid driver side rubber passenger and transmission no vibrations, Mike Lewis aka wolfplace balanced my rotating assembly.
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post #11 of 15 (permalink) Old Apr 4th, 19, 7:49 PM
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Re: Motor Mounts Solid Drivers/Polly

As far as the Moroso brand. Which one for a big block Chevelle, the 62515 or the 62530 ?
Thanks Joe.

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post #12 of 15 (permalink) Old Apr 4th, 19, 8:27 PM
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Re: Motor Mounts Solid Drivers/Polly

I have been running solid driver, rubber passenger with rubber trans mount with no issues at all. Highly recommended in fact.

I now switched the rubbers out to poly and will see if there is any difference. I honestly don't think there will be much difference, if any.

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post #13 of 15 (permalink) Old Apr 4th, 19, 11:54 PM
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Re: Motor Mounts Solid Drivers/Polly

Quote:
Originally Posted by NW68SSBBC View Post
As far as the Moroso brand. Which one for a big block Chevelle, the 62515 or the 62530 ?
Thanks Joe.
I just got a set of Lemon's headers, and he suggests a 62510. It is the same height as my Energy Suspension poly mount.

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post #14 of 15 (permalink) Old Apr 5th, 19, 12:44 AM
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Re: Motor Mounts Solid Drivers/Polly

Solid mounts on both sides, no vibration except my teeth are worn now from chattering... JK JK
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post #15 of 15 (permalink) Old Apr 5th, 19, 10:44 PM
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Re: Motor Mounts Solid Drivers/Polly

Quote:
Originally Posted by MarkP View Post
I just got a set of Lemon's headers, and he suggests a 62510. It is the same height as my Energy Suspension poly mount.
I took a look at the Moroso website and can offer the following

62510 has a distance of 2 1/8" from the bolt hole to the block face surface

62515 is. 2 9/32"

62530 is. 1 3/4"

The 62500 is. 1 11/16" but the distance between the actual motor mount ears is 2 1/2" the other three are 2 3/8"

It's all on their site if my writing doesn't make sense

Thanks Joe
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