Solid, poly or rubber motor mounts?
Solid, poly or rubber motor mounts? What are you using in your swap? The cheapass in me says use the metal you have and build solid mounts and use a rubber trans mount but I’m not sure if I’ll regret it.
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Joined: Jun 2016
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From: Central Cal.
Street-driven or race? If raced, then solid. Street, rubber or poly. If you're using a real loper of a cam, rubber might be your choice. It comes down to this: How much shaking can you or your passengers handle?
10 Second Club
Joined: Oct 2016
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I'm far from an expert and have minimal experience on the subject. But my mild cam solid mount car is not bad at all like some said it would be. It's not like it's going to spill your drink in the cup holders. To me it's most noticible on startup then not bad at all. And.... I'm also running a solid mount aluminum kirkey. I wouldn't hesitate running solid mounts ever again for comfort issues.
Pop, that’s why I’m asking what people are actually running. I can recall a few builds with solid mounts but looking for first hand opinions. This will be a street car
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Joined: Jun 2013
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From: Orange, Texas
I'm running solid motor mounts and a poly trans mount on mine, no issues. My turbo cam is pretty mild as far as overlap goes.
Drove it 750 miles round trip to MS last month and wasn't bothered by vibration.
Drove it 750 miles round trip to MS last month and wasn't bothered by vibration.
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10 Second Club
Joined: Oct 2016
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That is how mine is setup right now. I had the original thought everything needed to be solid. But as I read everyone seems to run a poly mount on the trans. I guess it's to allow for slight chassis flex?
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Verdad Gallardo TECH Regular
Joined: Jun 2013
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From: Orange, Texas
I personally liked the poly eng/rubber trans mount over rubber eng/rubber trans and poly eng/poly trans.
Me and my cousin had 4th gen f body cars mine poly eng/rubber trans his poly eng/poly trans and his vibrated far more and rattled in the cabin, mine was stock smooth and quiet inside.
All rubber is fine but it allows sooo much movement and flex. With an auto no big deal but with a stick car the shifter jumping all around annoys me.
I like having a little flex in there to reduce loads/impact on the trans case and eng mount bosses.
Me and my cousin had 4th gen f body cars mine poly eng/rubber trans his poly eng/poly trans and his vibrated far more and rattled in the cabin, mine was stock smooth and quiet inside.
All rubber is fine but it allows sooo much movement and flex. With an auto no big deal but with a stick car the shifter jumping all around annoys me.
I like having a little flex in there to reduce loads/impact on the trans case and eng mount bosses.
I have run, and have seen guys run, one poly and one rubber. It stiffens engine movement, but kills a little of the vibrations. I was running that for a bit, then switched to dual poly with a poly trans mount.
I like the dual poly mounts on the engine better, but Im considering switching to a rubber mount on the trans to help quiet/smooth things down a bit.
I like the dual poly mounts on the engine better, but Im considering switching to a rubber mount on the trans to help quiet/smooth things down a bit.
I have run, and have seen guys run, one poly and one rubber. It stiffens engine movement, but kills a little of the vibrations. I was running that for a bit, then switched to dual poly with a poly trans mount.
I like the dual poly mounts on the engine better, but Im considering switching to a rubber mount on the trans to help quiet/smooth things down a bit.
I like the dual poly mounts on the engine better, but Im considering switching to a rubber mount on the trans to help quiet/smooth things down a bit.
I have Poly in the engine, and a rubber mount on the trans. Initially, it had a notable vibration with the trans poly mount. It is actually from the engine, but was being transferred through the drivetrain. Once I swapped it out, it was much much better.
I also have poly body mounts, and I am against those now. They just transfer too much NVH into the cab of my truck. Over the past couple of years, the NVH has actually broken the passenger side door panel where GM plastic sonic welded it together. I will be swapping out the body mounts as soon as I find a good set of stock mounts. To buy a replacement set is almost $400, and I am not doing that.
I also have poly body mounts, and I am against those now. They just transfer too much NVH into the cab of my truck. Over the past couple of years, the NVH has actually broken the passenger side door panel where GM plastic sonic welded it together. I will be swapping out the body mounts as soon as I find a good set of stock mounts. To buy a replacement set is almost $400, and I am not doing that.
