Rear engine mount ?

1109 Views 28 Replies 12 Participants Last post by Oreo, Nov 12, 2005

HotSauce

Discussion Starter · Oct 18, 2005

Ok so i put on a VF rear engine mount the other day. When my car is at idle around 750-800 rpm's the car shakes quite rough, but when it gose over 800 rpm's it feels fine. I checked all blots to make sure they were on tight after 2 days of driving. Has this happen to any one? have any ideas?

Thanks

See less See more

1 - 20 of 29 Posts

OmniFocus

· #2 · Oct 18, 2005

That is normal for a polyurethane engine mount.

...less engine motion also equals more vibration. It's just the physics of it all.

A worthy trade-off for improved shifts, I say.

mievil

· #3 · Oct 18, 2005

If you think it's shakey now, just wait until you have to turn on the AC.

See less See more

HotSauce

Discussion Starter · #4 · Oct 18, 2005

turned heat on today

im gonna try some things i just read if it is a bad vibration it may be on to tight i think it needed 35 lb

See less See more

Z63R

· #5 · Oct 18, 2005

2

Maybe that's why I never liked that mount in my car; I always have the A/C on.
I also have a Lentech-modified autofantastic 4F27-E liquid transaxle.

(And unless I idled in neutral, teh vibraccione was even worse due to the turbine's static loading.

)

See less See more

mievil

· #6 · Oct 18, 2005

2

The only part of that I understood was the first sentence.

See less See more

Z63R

· #7 · Oct 18, 2005

2

Liar.

You understood the second one to0.

I will translate the third:

"And unless I selected neutral with the shift lever while the engine was idling, say, at a stop light or whatever, the vibration was amplified due to the torque convertor's physical characteristics of design, construction and orientation."

See less See more

RallyRacer

· #8 · Oct 18, 2005

Maybe that's why I never liked that mount in my car; I always have the A/C on.
I also have a Lentech-modified autofantastic 4F27-E liquid transaxle.

(And unless I idled in neutral, teh vibraccione was even worse due to the turbine's static loading. )

Very true; it would be funny to see some fool install all three poly mounts on their automatic Focus- it would literally shake the bolts loose from the interior.

See less See more

DisrupTer911

· #9 · Oct 18, 2005

i've got all 3 VF mounts on my automatic.

aside from like...my liscense plate rattling on my daskboard...

i don't even notice that it vibrates anymore...

Smurf

· #10 · Oct 18, 2005

i've got all 3 VF mounts on my automatic.

aside from like...my liscense plate rattling on my daskboard...

i don't even notice that it vibrates anymore...

yeah, you get used to all three mounts. And then, when you get a tune, you never even know they are there with a slightly bumped up idle other than the benefits of them.

See less See more

OmniFocus

· #11 · Oct 18, 2005

turned heat on today

im gonna try some things i just read if it is a bad vibration it may be on to tight i think it needed 35 lb

The mount has a metal bushing that prevents excessive compression due to overtorquing of the two fasteners.

I don't see how overtorquing the fasteners would increase vibration in this application.

Oreo

· #12 · Oct 19, 2005

Tuning is your friend. I was rather unhappy with the additional vibration also. Using SCT XCal2 I raised my idle to 950 & like someone already said "you'd never know it was there except for the benefits"

HotSauce

Discussion Starter · #13 · Oct 19, 2005

where can i get ahold of a SCT XCal2 with out paying $370, or would i have to go to a shop and maybe have them do it? i hate not doing things myself

Oreo

· #14 · Oct 19, 2005

That won't work. You'll have to buy one. The Xcals lock to a specific VIN# once they've flashed that vehicle. You could try putting a TINY pin-hole in the throttle body blade. But that's the ghetto-fix.

MichaelXi

· #15 · Oct 19, 2005

2

I don't have the VF mount, just the factory Dogbone with Prothane Poly-U bushings. (Roughly 1/4th the price

)
The only way that I have ever felt significant vibration is if the bushings aren't seated properly and there is metal-to-metal contact. (THEN, it will vibrate like Crazy!)
When properly seated, all is smooth, even with a relatively low idle.

See less See more

Oreo

· #16 · Oct 19, 2005

Same here MichaelXi... I got the inserts. They're installed propperly & at the stock 750rpm idle, it vibrates enough that my NON-Car-person MOTHER even asked if it had a miss, or if something was wrong- WITHOUT the AC on.

See less See more

MichaelXi

· #17 · Oct 19, 2005

How odd.
Mine is smooth as stock at idle when things are seated correctly.

See less See more

DisrupTer911

· #18 · Oct 19, 2005

Oreo, automatic or 5spd?

Michael's car is a 5spd S2...

i think it might have somethings to do w/ the transmissions TBH...

cuz if I put my automatic into Neutral. the vibrations go down significantly.

Oreo

· #19 · Oct 20, 2005

I've got a manual.

I mean, when see just how much play the stock mount has compared to the poly bushings... you HAVE to expect an increase in vibrations.

I STILL say I'd LOVE to hear about someone trying to mix & match the bushings. I'd bet the large poly bushing w/ stock small bushing on that mount would work reasonably well with a drastic reduction in vibrations.

Nliiitend1

· #20 · Oct 20, 2005

I've got a manual.

I mean, when see just how much play the stock mount has compared to the poly bushings... you HAVE to expect an increase in vibrations.

I STILL say I'd LOVE to hear about someone trying to mix & match the bushings. I'd bet the large poly bushing w/ stock small bushing on that mount would work reasonably well with a drastic reduction in vibrations.

Actually don't you think that would cause the smaller stock rubber section to tear apart more quickly?

I do. The stock rubber mount already has a hard time holding up to hard driving. When you take the play out of one side of the mount, it's probably gonna put more stresses on the weakest link (aka the stock rubber) and tear it apart. Maybe I'm wrong, but after seeing what my rubber looks like in some stock mounts when they come off, I doubt it.

1 - 20 of 29 Posts

This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.