Motor Mounts - Moving to Poly
Re: Motor Mounts - Moving to Poly
So we used 80# polyurethane in the motor mounts. For the positive - throttle response is greatly improved and the car seem much more solid & tied together. There is an improvement in both handling as well as acceleration.
Now for the negative there is a bit more roughness at idle but it is perfectly acceptable. At 3/5's throttle there is more noise and vibration. Above 4000 rpm the engine begins to get a bit thrashy.
No final verdict yet. I have only had time to put a couple of miles on the car and have not taken it to redline or driven down the hwy.
Now for the negative there is a bit more roughness at idle but it is perfectly acceptable. At 3/5's throttle there is more noise and vibration. Above 4000 rpm the engine begins to get a bit thrashy.
No final verdict yet. I have only had time to put a couple of miles on the car and have not taken it to redline or driven down the hwy.
Re: Motor Mounts - Moving to Poly
Had a little more time behind the wheel so wanted to update my impressions. Throttle response is immediate - there is no delay. I do not have a sprint booster but I think someone commented that one of the benefits was in taking off from the line. The motor mounts have a similar effect.
I mentioned previously that the engine gets a bit thrashy above 4000 rpm. Either I am getting used to it or I my initial impression was overblown. It is a bit rougher but not sure a passenger would really notice and I think it is a decent bit higher in the band than the initial 4k I reported.
I am happy with the poly motor mounts but am still debating whether to try 60# urethane vs. the 80#. I may go ahead and have my shop pour the 60# and swap for a comparison.
All of these impressions are based on ~20 miles total of driving so not a whole lot of seat time.
If you track your car at all I think this is a worthwhile mod. This is not a mod that would drive you crazy or really bother you in a daily driver. The bit of exhaust drone I have on the hwy is significantly more annoying than the motor mounts.
If you decide to pour your own mounts be very exact in your measurements of hardner to urethane. Even being off a small amount can ruin the batch.
I mentioned previously that the engine gets a bit thrashy above 4000 rpm. Either I am getting used to it or I my initial impression was overblown. It is a bit rougher but not sure a passenger would really notice and I think it is a decent bit higher in the band than the initial 4k I reported.
I am happy with the poly motor mounts but am still debating whether to try 60# urethane vs. the 80#. I may go ahead and have my shop pour the 60# and swap for a comparison.
All of these impressions are based on ~20 miles total of driving so not a whole lot of seat time.
If you track your car at all I think this is a worthwhile mod. This is not a mod that would drive you crazy or really bother you in a daily driver. The bit of exhaust drone I have on the hwy is significantly more annoying than the motor mounts.
If you decide to pour your own mounts be very exact in your measurements of hardner to urethane. Even being off a small amount can ruin the batch.
Re: Motor Mounts - Moving to Poly
I am liking this mod more and more. The car seems much more willing to downshift and much more responsive. On the hwy today is seemed to take less throttle opening to get it to kick down a gear.
Have not decided if I am going to do the 60# or not. I need some more time with the 80# motors mounts.
Have not decided if I am going to do the 60# or not. I need some more time with the 80# motors mounts.
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Re: Motor Mounts - Moving to Poly
Originally Posted by SRT6_Roadster
I am liking this mod more and more. The car seems much more willing to downshift and much more responsive. On the hwy today is seemed to take less throttle opening to get it to kick down a gear.
Have not decided if I am going to do the 60# or not. I need some more time with the 80# motors mounts.
Have not decided if I am going to do the 60# or not. I need some more time with the 80# motors mounts.
With a six-speed, I'm sure this would be a fantastic mod. I don't get much above 4,000 RPM in daily driving unless I'm truly giving it the beans, and at 130mph, luxury isn't at a premuim. A little extra engine vibration isn't going to detract from my permagrin much.
I do notice a bit of "clunkiness" in the 1-2 shift, seems as though the whole motor/trans has a lot of give to it. At 54,000 miles, I'm sure I'm past-due.
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Crystal (09-21-2022)
Re: Motor Mounts - Moving to Poly
here's some measurements I took from the new motor mounts that just went in.
You should be able to make up a jig/mould from this if required - I may.
The old mount that was still in one piece required me to slip a 12.5mm (1/2") piece of wood underneath it to make the same dimensions.
I guess that indicates it had sagged 1/2".
My indie mech thought I was crazy wanting the old casings back....
b22b
You should be able to make up a jig/mould from this if required - I may.
The old mount that was still in one piece required me to slip a 12.5mm (1/2") piece of wood underneath it to make the same dimensions.
I guess that indicates it had sagged 1/2".
My indie mech thought I was crazy wanting the old casings back....
b22b
Last edited by Billy22Bob; 02-15-2014 at 12:14 AM.
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