SC Power poly engine mounts - experiences?

[GreenV8S]

I'm still toying with the idea of replacing the OE rubber engine mounts with the poly ones from SC Power, but I'm concerned that they could be stiffer and transmit more loads to the engine mounting brackes. I'e already had problems with one bracket cracking and don't want to make it any worse.

If anyone here is using the poly mounts, have you noticed any more noise/vibration transmitted to the chassis as a result?

[GreenV8S]

stevieturbo said:

Bolt it in solid. Never worry.

Not for you maybe, but I drive a TVR and enough bits fall off that as it is!

[GreenV8S]

BB-Q said:

I'm currently looking for (cheap) poly mounts for my car.

can anyone point me in the right direction?

Don't know if they're what you'd call cheap, but these are the ones I'm talking about:

http://www.sc-power.co.uk/Polyurethane-engine-moun...

[GreenV8S]

stevieturbo said:

If the engine is currently bolted in with rubber, why would bolting it in solid weaken the chassis ?

I suspect the concern is that the chassis is relatively flexible and liable to flex under suspension loads. The rigid engine mounts would result in the engine acting as a structural member connecting the two sides of the engine bay together which would effectively make it a structural member. The concern is whether the engine block will be happy with those loads on it. I don't know whether it's a valid concern or not.

[GreenV8S]

stevieturbo said:

Lots of racers use the fact that an engine block is a rather strong piece of kit....to strengthen the chassis.

Yes that's true, but I suspect in most cases that's done after careful analysis of the stresses. In this case we have a big soft flexible aluminium casting which is already being heavily loaded by the engine internals. I have no idea whether it's a problem in this case, your experience seems to suggest not. The engine block is going to expand quite a bit when it gets hot - do you rely on your chassis bending?