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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).
Making the exhaust and inlet valve guides interchangeable for the Phantom Aluminium Head.

Identifier  ExFiles\Box 17\6\  Scan030
Date  23th March 1928
  
BY.{R.W. Bailey - Chief Engineer} from E.{Mr Elliott - Chief Engineer}
c. to BJ. Hs.{Lord Ernest Hives - Chair}

47060

E2/M23.3.28.

PHANTOM ALUMINIUM HEAD. X. 7060
Lec. 2464. X. 8050 X. 8060
X. 7050 X. 289

In reply to your BY8/G20.3.28., our requisition
is founded on the EAC.14 and RR.F. practice of making the
exhaust valve guide stouter, and we shew both a larger dia,
at the top, and a slower taper.

There is however much more projection of the
exhaust guide on RR.F. than on EAC.10 or 14. from the pro-
tective aluminium boss, and hence there is reason for the
EAC.10 valve guide to be of less heavy section, but I still
feel it should not be as light as the inlet guide is shewn.
Perhaps you could get HS{Lord Ernest Hives - Chair}' opinion on this. It
seems to me the best idea would be to make the exhaust and
inlet valve guides interchangeable at .750 dia. at top,
and 1 in 20 taper.

E.{Mr Elliott - Chief Engineer}
  
  


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