Pros and cons of 'solid' engine mounts

Pros and cons of 'solid' engine mounts

Author
Discussion

cnhss1

Original Poster:

938 posts

149 months

Monday 26th March 2007
quotequote all
im looking at replacing my cars 'bobbin' style Ford rubber engine mounts with something more solid to stop engine moving as much. This is primarily due to much larger than std diameter turbo downpipe and exhaust system and very little room around it. At rest it all clears but only just and dont fancy the engine moving and snapping the manifold/studs/turbo etc if it does move enough to catch the chassis rails.
std mounts are some ford (capri??) round rubber jobbies, 76mm diameter, 40mm thick with M10 studs in.
i can get ally ones made dead easy, but cant find a polyurethane version as yet as thought they may be less 'harsh' than a solid one. car is a mod prod hillclimber so not worried about noise, just worried there may be a downside to going to solid mounts.
my other thought was to slip a tight fitting tubular sleeve over the outside of the mount to stop excessive squidge, anyone ever done this?
Your thoughts please Gentlemen....

Nick_F

9,132 posts

178 months

Monday 26th March 2007
quotequote all
Might be simpler and more effective to fabricate a stabilzer brace to reduce the amount by which the engine can rock from side to side?

If you make it adjustable for length you could even preload it against the direction the engine twists.

Downside of solid mounts will be cracks in the chassis.

steve_d

11,742 posts

190 months

Monday 26th March 2007
quotequote all
I would not go the 'solid' route. Whilst you say you are not worried about the noise you could find your engine reaching a harmonic frequency with some other parts of the car which could cause you other problems.
A trip round a car breakers should produce a suitable alternative with a little less rubber and therefor stiffer. There have to be many hundreds of different designs out there. Don't forget a gearbox mount may also work.

I do like a good rummage around a breakers. You find all sorts of alternative design solutions.

Steve

cnhss1

Original Poster:

938 posts

149 months

Monday 26th March 2007
quotequote all
ok, thanks for the ideas, will try the stabilzer route i think.
something like a tie bar with rosejoints either end?
ive seen 'damper style' ones on jap stuff (often very blingrolleyes) but doubt this will overcome the torque reaction and ultimate movement but may reduce vibration and harshness. any ideas?

stevieturbo

13,386 posts

179 months

Monday 26th March 2007
quotequote all
Mines bolted in solid......I dont have a problem with it whatsoever.

I also bolted in my previous Rover V8 in solid too.

Its nowhere near as harsh as I thought it would have been. In fact, I think its perfectly fine.
Not sure how a 4 cylinder would feel though.
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marfgtti

22,907 posts

173 months

Monday 26th March 2007
quotequote all
I'm in the process of upgrading the tired OE mounts in my GTxx to solid rubber, poly would be too hard for my application, so I found a company who can produce rubber mounts of varying degrees of stiffness based on your requirements.

http://vibra-technics.co.uk/default.a