Replaced 996 engine mounts - wow!

Replaced 996 engine mounts - wow!

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Scrump

Original Poster:

14,698 posts

125 months

Saturday 28th November 2020
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I had read a few times over the years about how new engine mounts on a 996 or 997 give a real improvement to the handling by better control of the engine weight during cornering. These discussions usually go on to discuss which replacement engine mount is the best with options including RS mounts or solid aftermarket ones.

I don’t track my car and so have never explored the options in engine mounts. My 996 is now coming up to 20 years old and still had the original mounts (I think).

This week I had my engine mounts replaced. Not wanting any increased harshness I went with standard Porsche 996 mounts.

I wasn’t expecting very much of a difference just driving about normally on the street. I assumed the difference would only really be noticeable at higher speed cornering.

How wrong could I be? The improvement is immediately obvious. The car is less unsettled by bumps and the throttle response feels tighter. Even the gear changes are smoother.

I wish I had done this a lot sooner. So if any of you have the original mounts in your 996 then I can recommend replacing them, not cheap (especially for the standard Porsche mounts) but worth every penny.

bloody tourist

23 posts

57 months

Saturday 28th November 2020
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Sounds good, I hear this is something that is often overlooked. Did your 996 have many miles before the change?

Scrump

Original Poster:

14,698 posts

125 months

Saturday 28th November 2020
quotequote all
Just ticked over 100k miles. Treated it to the new mounts in celebration party

I replaced all the suspension only a couple of years ago. New springs, dampers, anti roll bars, top mounts, coffin arms, bushes etc. So all that side of things was already in good order.

m444ttb

3,136 posts

196 months

Saturday 28th November 2020
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I’ve been looking at doing this on my 2002 C4. Hartech said they were fine back in 2015 (only 10k miles ago!) but I think I’m going to get the gearbox whine sorted next year so feel like new engine and transmission mounts may be worth doing at the same time.

jonny996

2,332 posts

184 months

Sunday 29th November 2020
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If you don’t mind could you pop up the costs parts & labour.
Mine is prity well sorted but as you say these are often overlooked & I think it’s time to complete the circle

anyideas

239 posts

160 months

Sunday 29th November 2020
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I purchased the RS engine mounts that many have used from Type 911. I think the kit was £125 + VAT.


ditchvisitor

1,133 posts

188 months

Sunday 29th November 2020
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I recently fitted RSS engine mounts to my GT3 and the difference was incredible!!

ringweekends

584 posts

220 months

Tuesday 15th December 2020
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Ditto

RSS mounts in a 996 C4S and the difference was remarkable, not just for the surprising lack of NVH.
It's noticeable, coming from 60k mile OEM mounts, but certainly not harsh.

David W.

1,699 posts

176 months

Tuesday 15th December 2020
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ringweekends said:
Ditto

RSS mounts in a 996 C4S and the difference was remarkable, not just for the surprising lack of NVH.
It's noticeable, coming from 60k mile OEM mounts, but certainly not harsh.
This job done on recent Auto Amateur YouTube channel vid if anyone is thinking of diy.

shalmaneser

4,833 posts

162 months

Wednesday 16th December 2020
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David W. said:
ringweekends said:
Ditto

RSS mounts in a 996 C4S and the difference was remarkable, not just for the surprising lack of NVH.
It's noticeable, coming from 60k mile OEM mounts, but certainly not harsh.
This job done on recent Auto Amateur YouTube channel vid if anyone is thinking of diy.
It's also about as simple a DIY as you're likely to get. If you can change brake pads you can change engine mounts on a 996/997.

TheThrottleCable

19 posts

91 months

Wednesday 16th December 2020
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I also put RSS in my 996 and the change was night and day - most impressive was the improvement in gear change.

I made a how-to guide if anyone wants to attempt this themselves:

https://youtu.be/1exyTcURbs8

ATM

13,058 posts

186 months

Wednesday 16th December 2020
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I think my engine mounts are only 3 or 4 years old but the gearbox mount is original. I want to get that done.

HughG

3,190 posts

208 months

Thursday 7th January
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The gearbox mount is theoretically a gearbox out job.
There is a kit available to do it in the car, but it is about $300. https://agatools.com/products/aga-por-996-997-tmt
I got some steel CHS offcuts from one of our suppliers to make up something similar, but as the gearbox is coming out soon will get it done conventionally. If anyone wants the CHS bits to make up a puller then let me know and I will post them.

ringweekends

584 posts

220 months

Thursday 7th January
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Alternatively Powerflex do a gearbox mount insert which tightens it all up.

I did the RSS mounts and the gearbox insert in an afternoon, with lots of tea.

ATM

13,058 posts

186 months

Thursday 7th January
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ringweekends said:
Alternatively Powerflex do a gearbox mount insert which tightens it all up.

I did the RSS mounts and the gearbox insert in an afternoon, with lots of tea.
I've seen some chat about the gearbox inserts where people talk about cutting off some of the side. Did you install yours whole or trim it down?

LPAK

79 posts

9 months

Thursday 7th January
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Can someone explain the technical reason why this change makes such a big difference to daily driving feel? Very curious!

Kawasicki

9,600 posts

202 months

Thursday 7th January
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LPAK said:
Can someone explain the technical reason why this change makes such a big difference to daily driving feel? Very curious!
One possible reason... the engine movements stay more in sync/phase with the body motions...so the damping of the whole vehicle is better. Cleaner responses.

Imagine a loose football weighing 200kg in the boot of a normal car.

HughG

3,190 posts

208 months

Thursday 7th January
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LPAK said:
Can someone explain the technical reason why this change makes such a big difference to daily driving feel? Very curious!
https://www.flickr.com/photos/36385666@N00/5035971...

This was one of my mounts when I changes for RSS mounts earlier in the year. I changed them speculatively because the car felt unsettled over uneven roads, it was evidently the engine moving around eek

ATM

13,058 posts

186 months

Thursday 7th January
quotequote all
Kawasicki said:
LPAK said:
Can someone explain the technical reason why this change makes such a big difference to daily driving feel? Very curious!
One possible reason... the engine movements stay more in sync/phase with the body motions...so the damping of the whole vehicle is better. Cleaner responses.

Imagine a loose football weighing 200kg in the boot of a normal car.
This

LPAK

79 posts

9 months

Thursday 7th January
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Thanks for the additional insight smile