Replaced 996 engine mounts - wow!

[ATM]

In a full on racer you might want the engine to not move at all. So solid mounts.

In a driving miss daisy road car you would want the opposite because engines vibrate and transmit noise and vibration into the cabin. So soft squidgy mounts please Henry.

Everything in a car is a compromise. So we all want something in between those 2.

But worn out engine mounts are just worn out engine mounts. Pottering around you would never notice. Throw the car around a bit and that big heavy lump will be swinging around and unsettling the car.

[ringweekends]

ATM said:

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?

The first revision was a suboptimal design that David very quickly changed.

The insert I bought was the revised design - no trimming required.

[LPAK]

ATM said:

In a full on racer you might want the engine to not move at all. So solid mounts.

In a driving miss daisy road car you would want the opposite because engines vibrate and transmit noise and vibration into the cabin. So soft squidgy mounts please Henry.

Everything in a car is a compromise. So we all want something in between those 2.

But worn out engine mounts are just worn out engine mounts. Pottering around you would never notice. Throw the car around a bit and that big heavy lump will be swinging around and unsettling the car.

Is this something that is checked during a service? Or do you just get to a point close to 100k miles when you say to the specialist or OPC that you want new engine mounts?

[shalmaneser]

LPAK said:

ATM said:

In a full on racer you might want the engine to not move at all. So solid mounts.

In a driving miss daisy road car you would want the opposite because engines vibrate and transmit noise and vibration into the cabin. So soft squidgy mounts please Henry.

Everything in a car is a compromise. So we all want something in between those 2.

But worn out engine mounts are just worn out engine mounts. Pottering around you would never notice. Throw the car around a bit and that big heavy lump will be swinging around and unsettling the car.

Is this something that is checked during a service? Or do you just get to a point close to 100k miles when you say to the specialist or OPC that you want new engine mounts?

When you come on and off the power does the car shunt at all? Are the exhaust tips hanging low? If so the engine mounts are likely shot. Garages don't seem to check these very much for some reason. My fiancee's Boxster needs the mounts doing and it never gets bought up at the service. Will do it myself at some point.

[RiccardoG]

Its not really a service item. They either fail or not. Depends on how the car is used, etc. If they start to go then you might see some fluid around them or, more relevant as stated above, exhaust tips dropping. I've had them on my to-do list for a few years, will likely do it at this year's service, this thread has me sold!

Btw, you can try and source Corteco parts, which is the OEM manufacturer. For 997 pricing I have seen around £150 each. Therefore roughly a £400 job "all in" at a specialist.

[LPAK]

shalmaneser said:

When you come on and off the power does the car shunt at all? Are the exhaust tips hanging low? If so the engine mounts are likely shot. Garages don't seem to check these very much for some reason. My fiancee's Boxster needs the mounts doing and it never gets bought up at the service. Will do it myself at some point.

Is the shunting very obvious? Like any reasonably powered car, there's a bit of shunting when letting off accelerating, but I haven't sat there wondering if it's a bit more than usual.

Exhaust tips aren't hanging low.

I'm wondering if I've just been living with it and not noticed it. I'd imagine if I asked the question to the garage, that the answer will likely be to replace them...

[ATM]

LPAK said:

Is the shunting very obvious? Like any reasonably powered car, there's a bit of shunting when letting off accelerating, but I haven't sat there wondering if it's a bit more than usual.

Exhaust tips aren't hanging low.

I'm wondering if I've just been living with it and not noticed it. I'd imagine if I asked the question to the garage, that the answer will likely be to replace them...

I get a bit of shunting and my engine mounts are quite shiny but the body bangs around a lot due to my rock hard - read ridiculous - suspension. I assumed little shunt was a feature of cable throttle.

[jonny996]

Apologies for being really stupid but if someone has recently done this could you drop the URL for what I should be ordering, looking for the softer OEM option over the semi or solid version but trying to avoid Porsche prices.

Thanks.

[m444ttb]

I’ve just bought some RSS engine mounts plus the Powerflex gearbox inserts to hand to my local indy in 6 weeks time when the cars goes in for it’s annual service and MoT. I’m a bit nervous it’s going to make the car horrendous but if it’s ok on a motorway cruise then I’ll be happy with whatever it’s like elsewhere. I gather from this thread and elsewhere they will settle down a little in time anyway.

[jonny996]

do I need to order anything else other than this?
https://type911shop.co.uk/epages/de867ca1-377e-432...
thanks

[shalmaneser]

jonny996 said:

do I need to order anything else other than this?
https://type911shop.co.uk/epages/de867ca1-377e-432...
thanks

https://type911shop.co.uk/epages/de867ca1-377e-432e-84fd-bdccf2206766.sf/en_GB/?ObjectPath=/Shops/de867ca1-377e-432e-84fd-bdccf2206766/Products/9792

You need to buy this as it includes the fixings

[jonny996]

shalmaneser said:

https://type911shop.co.uk/epages/de867ca1-377e-432...

You need to buy this as it includes the fixings

Cheers, ordered.

[jonny996]

Wow, really is the perfect word to describe the change in ride feel.
If gone from original mounts on 10 year old continental tyres to new semi solid mounts on new Goodyear eagles & it’s like a brand new car.

[Onetrackmind]

Hi All,

Interesting thread. Thinking of doing the same on a 996 turbo. Assume these will work? https://type911shop.co.uk/epages/de867ca1-377e-432...

Surprised how cheap they are compared to the aftermarket ones on Design911 - they're all around the 300 quid mark.

[Scrump]

jonny996 said:

Wow, really is the perfect word to describe the change in ride feel.
If gone from original mounts on 10 year old continental tyres to new semi solid mounts on new Goodyear eagles & it’s like a brand new car.

Glad to hear it worked for you too

[Kawasicki]

Very happy it worked out!

[jonny996]

Onetrackmind said:

Hi All,

Interesting thread. Thinking of doing the same on a 996 turbo. Assume these will work? https://type911shop.co.uk/epages/de867ca1-377e-432...

Surprised how cheap they are compared to the aftermarket ones on Design911 - they're all around the 300 quid mark.

Indy I use done mine with those that I supplied & he was impressed with the kit

[m444ttb]

m444ttb said:

I’ve just bought some RSS engine mounts plus the Powerflex gearbox inserts to hand to my local indy in 6 weeks time when the cars goes in for it’s annual service and MoT. I’m a bit nervous it’s going to make the car horrendous but if it’s ok on a motorway cruise then I’ll be happy with whatever it’s like elsewhere. I gather from this thread and elsewhere they will settle down a little in time anyway.

A little update. I had the RSS mounts for installed when the car was serviced last week. I decided not to fit the Powerflex gearbox insert as I wanted to have some idea, if it was awful, which part was responsible. I have to say beyond a bit more vibration at idle and when passing through c.1,100rpm it’s very little different in a bad way. The only other time I notice more feedback through the car is lifting off at higher RPM and drifting back down through the gear. On a second drive it seems quieter too so perhaps they have settled in a little. Quicker than I’d anticipated if so. The lack of movement from the engine is noticeable on both acceleration and deceleration, but also to some extent when changing direction.

My previous experience of harder engine mounts was my wife having some GrpN mounts installed on her 106 GTi a decade ago. Other than just vibrating through the entire car all of the time it also seemed to amplify the boom from the PeugeotSport exhaust (itself made worse by the motorsport cat compared to de-cat). It was quite unpleasant on a long trip whereas my car will be just as before when the exhaust valves are closed.

[ArchiesDad]

I fitted the RSS Mounts and echo what others have said. The notchy 2nd gear was eliminated and the whole car drove different. No discernible increase in NVH over and above what you would want from a 911, my PSE also seemed to rev out a lot crisper and seemed to be slightly raspier ? My Wife noticed this so it must be a thing as she doesn’t miss a trick !

I fitted the standard 964 RS mounts to a 964 Turbo about 5 years ago and couldn’t tell any difference what so ever, maybe the ones that were on weren’t as saggy or possibly were the RS mounts?