Vibration after poly motor mounts

ForcFed93 · Aug 18, 2017

So after the install of my headers/poly motor mounts, I have a pretty significant vibration from about 11-1400 rpms. After the motor is warmed up, the mounts seem to soften a little bit and ease the vibration but it's still pretty noticeable. I'm sure it doesn't help that I also have poly rack bushings which transmits vibration from the K Member through to the steering wheel also.

So my question is this: Without removing the poly mounts how can I ease this vibration? Will it reduce over time? Will a quality harmonic balancer help?

evilcw311 · Aug 18, 2017

Balancer sounds subject to me with where it's doing it in lower rpm's. It would be less noticeable at higher rpm's. Kinda like when you have a tire out of balance and you hit a certain speed you can feel it then accelerate past that speed and it disappears.

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ForcFed93 · Aug 18, 2017

evilcw311 said:
Balancer sounds subject to me with where it's doing it in lower rpm's. It would be less noticeable at higher rpm's. Kinda like when you have a tire out of balance and you hit a certain speed you can feel it then accelerate past that speed and it disappears.

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I may just end up ordering the March 1158-08 fluid dampener. Free up a little HP and hopefully smooth it out some. I feel like I'm just throwing hundred dollar bills at this thing left and right. Oh well.

SnakeBit! · Aug 20, 2017

steeda has a good one and is less expensive I think.

ForcFed93 · Aug 21, 2017

SnakeBit! said:
steeda has a good one and is less expensive I think.

I've only seen Steeda sold as a whole underdrive pulley set up, which I don't want. Not to mention, the set up is about $250, whereas the March P1158-08 is only about $125. Only downside is that I'll have to get a shorter belt to accommodate it.