I installed solid mounts to eliminate installation issues with my headers and possible banging of the pipes on stuff while driving. Do you guys have any ideas for eliminating some of the cabin vibration? I was thinking of like a poly insert between the mount and chassis.

 

i have poly MM and tranny mounts......i have a ***** smooth idle......and you would never know i had the mounts unless i told ya.....work on getting a smooth idle

 

any other knowledge on this peeps? trying to figure something out for my buddies solid mount vibration problem as well

 

Need to change to poly mounts.

 

Only option I know of is to switch to Poly-mounts.

 

What about putting some sound deadener in key areas? Anyone tried this?

 

Instead of working around the problem with stupid ideas, why not just take the aforementioned advice and replace the solid mounts with urethane?

 

Sound damping isn't going to stop cabin vibration; it's designed to reduce harmonic resonance, not vibration of the magnitude a poor idle and solid mounts will cause.

If you're running a poly trans mount, switch to a stock rubber one; otherwise, it's deal with the vibrations, or switch to poly motor mounts.

 

Well, as I mentioned above. I installed the solids because my headers wouldn't fit with the stock mounts and I've read that polys don't help this issue. I would be incredibly pissed if I bought polys, did the work, and still had fitament issues or banging.

 

What header/y combo do you have? Both mounts will put the motor in the same place the poly will just help deal with the viiiiiiibes man. Poly mounts really don't allow for THAT much movement.

 

If you have that much vibration, then maybe something else is wrong, like the engine is missing or flywheel/clutch is unbalanced or something.

 

I have LPP headers, which will not work with the stock mounts unless you grind them. If I knew for sure the poly mounts would free up enough space I would probably try them. Working in that area is no walk in the park.

The vibration isn't real bad, just enough to make the platic interior buzz.

 

I mean no offense, however it sounds like the answer to your problem has been listed by many but you aren't willing to take steps to implement it.

Stock rubber is compliant to do what? - kill Noise Vibrations and Harshness!
Polly has most of the benefits of rubber without the flaw of being overly compliant.
Solid mounts suck for anything but a purpose built race machine. They amplify EVERYTHING, especially misfires and imbalances.

I've had all three and won't ever do solid mounts on a street / daily type car that I own again.

 

I don't have headers but I do have Poly Mounts and they work Great. I would double check the information you got about grinding them because the poly part of poly Mounts fit inside the OEM Clam Shell.

 

what rpms are the vibrations occurring in? how about when you rev the engine in park or neutral?

 

I tried to install the headers with the stock mounts originally and they would not fit. I talked to some people on here and they recommended grinding the mount. So the question is if the headers won't fit without grinding the stock mount, will they fit with the poly mount?

The vibration is at idle.

 

The poly engine mount fits in the oem mount clam shell, so if the oem required grinding then so will the poly.

 

Sell **** headers, install poly mounts, buy good headers, enjoy driving again?

With the amount of good headers that aren't expensive for f-bodies, I can never understand the lure of slightly-cheaper, Chinese **** metal headers from ebay that never fit right and require a bunch of ghetto hacking to run.

 

At one point everyone was recommending LPP. Perfect fitment, stainless, nice y-pipe. So I purchased them, and I have the same problem as the OP.

 

Pretty much sums it up right there....