Center Muffler Replacement for 1971 Silver Shadow Coupe
Posted in the Rolls-Royce Forum
#1 Aug 8, 2011
Hello, this is Martin Mindling in Ohio. My car is a 1971 Silver Shadow coupe. Can anyone suggest a reasonable replacement center muffler - brand and type? This is the single muffler that is under the driver's floor. Thanks and Regards,
#2 Aug 9, 2011
I'm afraid that all the exhaust components are unique to Rolls Royce and can only be replaced with the same. The best you could do would be to aproach a reliable 'muffler shop' that has been recommended and see if they can fabricate something for you.
In the UK all the boxes are made from stainless steel, but most of the interconnecting pipes are mild steel and then welded or brazed together. I think you can get full stainless systems in the US and Australia though. The problems that can occur are mostly down to the way the system is suspended under the car. Crewe (in their infinite wisdom) decided to use a vastly over-engineered double sprung and damped set of 3 'absorbers' which sell for a round $100 ... each! Alignment of these is critical and rarely the same for any two cars.
Just to confuse the issue, RR define the middle two boxes together as 'the rear silencer (muffler)' and the last one 'the tailpipe'. As a '71 model the front box should be just a muffler rather than a catalytic converter unless it has been upgraded to the later system. otherwise the rest of the system is (or should be) identical. The correct RR names and part numbers, from front to back are:
Downtake Pipe (left hand): UR18825
Front Pipe (right hand): UR18821
Front Silencer: RH8149 (Alternative Catalytic Converter: UR18841)
Rear Silencer (2 boxes): RH8251 (swb) RH 8252 (lwb)
Tail Pipe: RH8866
Tail Pipe Trim: UR19205
Absorbers (3 of): UR19245
NOTE. The 'front' and 'rear' mufflers are joined with a pair of half clamps (RE245307) with an olive (UR5367) to internally seal the joint.
If the front box is a cat it will have another identical set of clamps and an olive joining it to the Front Pipe, otherwise the joint will be welded with a joining collar (RH7987).
Having just replaced the full system on my '76 Shadow SWB with a nearly new one taken from a car being broken I can tell you that it is definitely not a system designed for the DIY owner. Although it is just possible for one man to do the job, a second pair of hands can reduce the time taken considerably and reduce the number and severity of bangs, scrapes, contusions, abrasions and strong curse words!
#3 Aug 9, 2011
Thank you, especially for the parts numbers data.
If you let me know your email, I'll send a photo
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