Rolls-Royce Archives
         « Prev  Box Series  Next »        

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).
Test report on Lodge C.3 and C.H.3 spark plugs for the Phantom II engine.

Identifier  ExFiles\Box 162\6\  img157
Date  1st June 1932
  
x4415

SPARKING PLUGS.
(PHANTOM II)

LODGE TYPES C.3 AND C.H.3.

Conditions under which these plugs were run :-

5.25 : 1 comp Ratio (turbulant head).
W.W. (114º) Camshaft.
Complete standard induction system.
" " P.II Silencer system (longtype silencer)
Run at 3000 R.P.M. developing 120 B.H.P.
(67.8 B.M.E.P.)

LODGE C.3.

Under the above conditions, after running for 10 minutes at full throttle (full load), preignition was apparent by loss of power, and erratic running on the magneto plugs (Battery 'off'). After shutting down, engine remained running switched off.

LODGE C.H.3.

The results with this type were similar to C.3. preignition after 10 minutes.

Upon inspection C.H.3. type, shewed signs of having become hotter than C.3. The C.H.3 plugs having (approx) .150 longer reach than C.3. type.


C.F.Salt.
  
  


Copyright Sustain 2025, All Rights Reserved.    whatever is rightly done, however humble, is noble
An unhandled error has occurred. Reload 🗙