Solid Engine Mounts and Tranny Mounts
Thread Starter
Racer
Joined: Sep 2019
Posts: 349
Likes: 44
From: Spokane, WA
Solid Engine Mounts and Tranny Mounts
The merits and demerits of solid motor mounts have been discussed to death and I have read quite a few posts on the subject. When looking at the Moroso website for part number 62530 for my '69 SBC, Moroso states:
"Solid Motor Mounts must be used in conjunction with Solid Transmission Mounts to prevent breakage of engine block and transmission case due to torsional stress."
Hmmm...not sure what to think. I would be running solid motor mounts and a rubber trans mount. Thoughts?
Thanks
Sammy
"Solid Motor Mounts must be used in conjunction with Solid Transmission Mounts to prevent breakage of engine block and transmission case due to torsional stress."
Hmmm...not sure what to think. I would be running solid motor mounts and a rubber trans mount. Thoughts?
Thanks
Sammy
Pro
Joined: Nov 2015
Posts: 600
Likes: 110
From: Mainz
For that reason (using solid tranny and engine mounts) i was adviced Not to! I have solid steel Moroso engine mounts and oem tranny mount new... No problems so far, i do like my solid motor mounts with the 383...
Thread Starter
Racer
Joined: Sep 2019
Posts: 349
Likes: 44
From: Spokane, WA
Maybe I am just reading this the wrong way? Maybe they are saying if you use a solid trans mount you MUST use solid engine mounts which absolutely make sense. I think I was reading this as Moroso saying that if you use solid engine mounts you must then use a solid trans mount which doesn't make sense.
Pro
Joined: Nov 2015
Posts: 600
Likes: 110
From: Mainz
If You have solid steel motor mounts, and solid steel transmission mount, then the vibration of the engine gets directly transfered onto the the solid transmission mount of which transferes it to the weakest point where it screwed on the cast housing and the cast can eventually brake under this stress. If the transmission mount has a rubber cushion to absorb some of the vibrations, so they are not directly transfered to the cast casing then this should be better... At least that what i was told and it makes sense to me...
Thread Starter
Racer
Joined: Sep 2019
Posts: 349
Likes: 44
From: Spokane, WA
Also a possibility. The current rubber mounts have not failed...they are just from 1989 when the engine was rebuilt. I do have a set of poly...but with the two piece design the power steering bracket will be pushed out about an 1/8th altering the pulley alignment. Maybe not enough that can't be absorbed by the designed play in the PS shaft...but misaligned nonetheless.
Race Director
Joined: Mar 2017
Posts: 11,944
Likes: 4,506
From: Virginia
The semantics of the imprecisely written Moroso statement have been beaten to death before.
I don't know if there is consensus on this Forum, but my understanding is that solid motor mounts are fine with a rubber trans mount, and this is likely the preferred solution. If you have a solid trans mount, you then MUST use solid engine mounts. I have solid Moroso mounts, and a rubber trans mount.
I don't know if there is consensus on this Forum, but my understanding is that solid motor mounts are fine with a rubber trans mount, and this is likely the preferred solution. If you have a solid trans mount, you then MUST use solid engine mounts. I have solid Moroso mounts, and a rubber trans mount.
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Le Mans Master
Joined: Aug 2017
Posts: 8,336
Likes: 2,810
From: Cool Northern Michigan
Here is another version to add of what you can & can not do with mounts:
Rubber in the front / rubber in the back.
Steel in the front / rubber in the back.
Steel in the front / steel in the back.
Never,
Rubber in the front / steel in the back.
Rubber in the front / rubber in the back.
Steel in the front / rubber in the back.
Steel in the front / steel in the back.
Never,
Rubber in the front / steel in the back.
Thread Starter
Racer
Joined: Sep 2019
Posts: 349
Likes: 44
From: Spokane, WA
The semantics of the imprecisely written Moroso statement have been beaten to death before.
I don't know if there is consensus on this Forum, but my understanding is that solid motor mounts are fine with a rubber trans mount, and this is likely the preferred solution. If you have a solid trans mount, you then MUST use solid engine mounts. I have solid Moroso mounts, and a rubber trans mount.
I don't know if there is consensus on this Forum, but my understanding is that solid motor mounts are fine with a rubber trans mount, and this is likely the preferred solution. If you have a solid trans mount, you then MUST use solid engine mounts. I have solid Moroso mounts, and a rubber trans mount.
Race Director
Joined: Jan 2000
Posts: 13,017
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From: Corsicana, Tx
2020 C2 of the Year - Modified Winner
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Definitely stock or poly trans mount with solid engine mounts. Frames twist....aluminum trans cases crack.
JIM
JIM
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,063
From: altered state
St. Jude Donor '05
Agree. Poly engine, rubber trans here; had poly trans mounts and got vibration issues, trans guy beat it through my head to stick a rubber trans mount in there, problem solved
Has to be some "give" somewhere.
Has to be some "give" somewhere.
