solid mounts vs stock mounts

[black_81_vette]

Hello I am in the middle of swapping a new engine into my 81 4 speed vette.What I need to know is since this is a very healthy engine going in I was leaning to the side of using solid motor mounts to restrict some drive train movement.Is this a good ideal? And do I need to run a stiffer or solid trans mount too? Also can any real harm happen to the frame, engine ect from using solid mounts?

 

[Jack]

Don't go solid if you drive it regularly ... solid will cause many vibrations, rattles and cracks ... solid is for race cars that get disassembled-checked frequently. Polyurethane engine & trans mounts by energy suspension, prothane etc are a good choice ... they're very strong, durable and firm.
JACK:gap

 

[Fishman]

I have had solid mounts in mine for 6 months now... the ZZ motor (or was it me?) broke the rubber ones. No problems with the solid mounts (Morosso)... my wife says she never noticed the difference. I have to tell folks about the solid mounts because no one who has gone for a drive has noticed.

But... the entire car is pretty new (engine, exhaust, suspension, interior, etc.), not sure how they would be with some 'other' work needing to be done. Also replaced the trans mounts with new rubber when we put the engine mounts in (just to be sure).

 

[1979toy]

I was always told that you had to use a solid transmission mount if you used solid engine mounts.
I have ridden in a car equiped with solid engine mounts and could hardly tell an increase in vibration but I put it down as a real good engine balance job. Maybe the solid mounts arn't all that bad.

 

[waterboy1976]

energy suspension poly mounts here.......nice and smooth.....

 

[drags1998]

Im with Waterboy, I would not use solid on the street!!!!! Trust me, you'll BUST-UP the 4spd. before you hurt a new,good quality motor mount!!!!

 

[norvalwilhelm]

I like the poly mounts. I have never tried solid mounts but I did have a torque strap on the drivers side head. If I tightened it too much the car had a vibration or shutter when idleing at the lights, it could definitely be felt so I would loosen the torque strap went not needed.
I feel solid mounts transmits every vibration, every shutter and are too harsh for the street.

 

[SG4206]

OK , I want to put in my 2 cents.

For the street ,I run a solid mount on the left bank and a stock on the right. The longest period of time on the street ,was for 6 years on a '73 I had. Never had any problems. I do this primarily on the stick cars ,because the factory shifter is mounted to the cross member. I gained much less missed shifts ; because the linkage stays aligned properly. I'm not easy on my equipment , I'm a user,not a collector.

Currently ,as far as street cars; my '66 is this way; even though I changed to a Hurst unit. In my opinion , anytime you can eliminate flex , parts last longer. I don't like the engine bouncing around in the engine bay.

As long as I've had street and race cars , I've never had a problem related to solid mounts.

Build it to be used!

 

[bobherr46]

Check out a NAPA part #602-1127 mount for the motor. These are for a 396 Chevelle and are larger than the stock and aftermarket mounts I have seen. I just used these on my 79 L82 engine rebuild. I also drilled holes through the mounts and put Grade 8 bolts in them reasoning that I retained the vibration damping of a rubber mount but that the bolts would keep the engine from torking under hard acceleration. So far so good. You will probably have to grind the bolt heads some to get the mounts to sit down on the frame towers. Comments from other readers on this little piece of "engineering" are welcome. - Bob

 

[patsnitrovette]

ive been using solid mounts in all my cars for years,moroso's,and dont notice hardly any vibration.