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From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Experiment to cure exhaust booming using a multi-tubular exhaust pipe.

Identifier  ExFiles\Box 38\4\  Scan079
Date  16th March 1925
  
Secret
(31436)

Hs.{Lord Ernest Hives - Chair}

EP{G. Eric Platford - Chief Quality Engineer}8/H16.3.25.

EXHAUST BOOMS.

The following may interest you, it being the experience of someone who considers they have cured certain cars of exhaust booming:-

"A multi-tubular exhaust pipe and manifold were fitted to the engine in place of the ordinary exhaust pipe and silencer, tubes being 1/2 internal diameter, 32 in number and 7 ft. long. This size we found increased the speed of the car by two miles per hour, reduced the back pressure and removed the boom complained of. The rear end of the nest of tubes were cut off on a long slant, so that each individual pipe exhausted into the atmosphere at a slightly different time (We are now having completed this system throughout on an engine - induction and exhaust manifolds). This made the exhaust of the engine more silent than previously, and also, which was very peculiar, raised the critical period of the engine about five miles per hour higher. The body on which this experiment was carried out was so sensitive that a passing lorry would start the boom 150 yards away and increase as the two vehicles passed and gradually died away again. This with our car standing still and the engine also standing. This was a new car by one of the best makers, which they kindly lent me to experiment with."

EP.{G. Eric Platford - Chief Quality Engineer}
  
  


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