Solid motor mounts:

[rickeolis]

So I've read that the solid motor mounts can be better for your shifting and doesn't really add too much vibration in driving.
I plan on a street legal autocrosser with my car as time goes on, so my question is; For those who actually have solid mounts in their cars, is there too much noticeable vibration?

[ErVikingo]

eeeehhhhhh yeeeessssss, now seriously, what I experience I would more clearly define it as a very high pitch vibration or buzzing. It all depends on RPMs.

On my race car for example, everything vibrates at least while not in motion (after that, my brain is not thinking about it....)

[steveW]

Ha!! This is another of the must do's for my sweet thang 2.2T, and I'm also interested to find out how uncomfortable solid mounts will make the car as it is used quite a lot.

By the way, here are some of the other must do's.
1) Fit front roll bar (sway bar to you funny lot)
2) Fit 7" rims on rear
3) Fibreglass front & rear bumpers
4) Junk std airfilter for 6 foam socks
5) Replace std passenger seat with 'R' bucket type

Here are some of the have done's
1) Made lightweight door panels
2) Removed rear seat back rests
3) Removed side trim strips
4) Fitted 4-pt harness & race seat
5) Made two stubby straight thru silencers (mufflers to you
funny lot)
6) Got completely sideways at every corner at a recent time trial!!


Cheers

[rickeolis]

Viking- So it doesn't really rattle the teeth?!?!?


Steve- Yes I am slowly working on the same stuff, but currently fixing rusty panels now that my carpet and seats are out. Where did you get your race seat? Does it slide or is it fixed? I forget who said "Adding lightness!" What kind of tires?


Anyone else have the mounts installed?

[Jack Olsen]

Here's the secret to solid motor mounts -- courtesy of the personal research of Tyson Schmidt of TRE Automotive. You put solid mounts in back, at the rear mounting points, and sport mounts at the tranny mounting points. The rear mounts give you 80% of the benefit, and 20% of the noise. The front mounts are the reverse -- much more noise and much less benefit.

Tyson tried it each way. That was his conclusion. I've got the solid mounts in back, and sport mounts by the tranny.

[jwetering]

Colin Chapman coined the phrase "adding lightness" notice that it's my little burb thingee there under my name.

For those of you with really bad memories....Colin Chapman and Lotus are one in the same.

cheers

[ErVikingo]

Rick,

My 2.0 liter rattles quite a lot, keep in mind it is high compression, ...

I like Jack's suggestion of using solid & spot in the tranny. What I found when I did the solid mounts was that I the shift linkage bushings needed replacing and a lot of stuff had to be tightened up (I never notice the vibrations as much before).

Rick, it depends on how radical you want your car. You might want to try the club sport type since they are much tougher but not fully solid (I'm told).

Let us know how you do with this. Juan

[steveW]

Rickeolis

My seat is made locally in South Africa and I fixed it by making a subframe that bolts straight onto the existing seat mounting holes. I fixed the seat so no-one else will drive my car - I've got short legs and sit close to the Momo steering wheel.

I replaced worn out rear engine mounts (with good used parts)and it made a gear changing much more positive, so I imagine solid mounts would be even better.

Cheers

[rickeolis]

Thanks guys!

Jack, that was the answer I was looking for, I see solids sold everywhere but not the sports you speak of, where where??

Steve, I got nailed by the infamous 5-2 shift last year and had quite the repair bill, and still have sloppy shifting, even though they also replaced the shifter base and bolts. This should help some I hope.

Viking, is your engine a stock 2.0S? What 0-60 do you think you get? It is a good autocrosser?

[dickster]

Rickeolis

have a look at pelican - i'm sure they list them (sport mounts).

[rickeolis]

A ha! Thanks, I did look before, but didn't quite see what I was after, thanks Dickster....


From Pelican parts:

We have never seen a set of original motor mounts that are not cracked. Worn mounts will cause sloppy shifting, and also cause the drivetrain to shift when accelerating. We currently have 2 options for replacing your motor mounts. The stock mounts offer a good, although more expensive solution that will keep your car original. The sport mounts are a direct replacement for the original mounts (Pelican Recommended). On the early 911s (1965-71), it is not possible to replace the mounts without replacing the entire motor mount crossbar.

911 Stock Motor Mount, ea
C-375-043-00 $60.40
911 Sport Motor Mount, ea
C-375-043-07 $39.95
Competition Motor Mount Set

Set of 2 solid motor/transmission mounts for the Porsche 911. Mounting plates are laser cut from high strength steel, with lightening holes to reduce unwanted weight, these are then Tig welded to the spacer boss. The boss is

Competition Motor Mount Set, Pair [Photo]

911 Sport Motor Mount, ea

[steveW]

Rickeolis

My beloved other half is a RHD and I think the tendency to pull the gear lever towards oneself is a saver on RHD cars as I often go from 2nd to 5th, but never from 5th - 2nd or 4th - 1st.

Also I treat the box as a conventional 4spd as 1st is impossible to engage unless the car is at a standstill (syncro's shot, I suspect)

[jwetering]

Sorry to ressurect an old thread - but I want to confirm that the "clubsport" mounts my guys wants to sell me are the same as the "sport" mounts that are being discussed here. I am pretty sure that the "clubsport" mounts being offered are a Porsche built part.

[Wil Ferch]

Guys:
Here's a revelation...
Look up "sport" or "clubsport" mounts....then check the part number for Cabriolet mounts....yep, one in the same...much more sexy when ordering clubsport instead of wimpy cabriolet mounts, huh?
--Wil Ferch

[rickeolis]

Steve; yeah, my first gear is the same way, fortunately 2nd pulls from waaaay down very well.

[A Quiet Boom]

Not sure I agree with mixed mounts as it will put more strain on the solid mounts than the stock ones. Try this on a front engine rear drive car and you break stuff (ask me how I know LOL). Just from a stress standpoint I'd use the same type of mount all the way around, but hey that's just one nutcases opinion hehe FWIW I've run solid mounts on plenty of big cammed dragcars the vibration isn't any worse than the sloppy stock mounts that let the engine bounce around on mild cammed motors it's more noticeable but not bad, I only mention this because the type of motors I'm refering to are nowhere near as smooth as a 911 motor. One thing to think about also is that 911's are splitcase motors and solid mounts effectively make the motor a stressed part of the chassis, not sure if that's such a good thing for a street car with a motor prone to oil leaks. FWIW