Rolls-Royce Archives
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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).
Performance graph of a PI unit comparing a large valve cast iron head with a standard valve aluminium head.

Identifier  ExFiles\Box 13\2\  02-page100
Date  12th June 1931
  
V.1168
POWER TESTS ON PI UNIT WITH
4.9:1 COMP RATIO
A - LARGE VALVE HEAD (CAST IRON)
B - STANDARD VALVE HEAD (ALUM)
TESTED WITH TWIN-CARBS 1.300 CHOKES
" " OPEN EXHAUST
" " STANDARD CAMSHAFT
LARGE VALVE HEAD TO E.80170/1/2
A
B
BHP
B.M.E.P.
LBS/□
R.P.M
P.W.S.
12-6-31.
  
  


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