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).
Technical notes on gearbox synchromesh, dashboard insulation, clutch, and component weights.

Identifier  ExFiles\Box 173\1\  img426
Date  19th February 1934
  
-4-

They pair off gears in a silence room before fitting in box.

They use a pot lap such as we do on aero gear splines.

They use a synchro mesh cone of 6°, width of face 7/16" dia. at large end 3¼". To prevent sticking they turn a very fine screw thread (100/1") in the brass face of the cone, the only other treatment being radial slots for oil -

[Image diagram with labels: SCREW THREAD, SLOTS]

DASHBOARD.
Two thin facings of sheet metal enclosing ¼" of felt asbestos type insulating packing.

CLUTCH.
As on Lincoln & Cadillac, single plate long.

WEIGHTS.
Light 8 engine, including flywheel disc but no clutch - 320 cu.ins. 808 lbs.
Gearbox (3-speed) & bell housing 131 lbs.
Clutch, less flywheel fixed to crank 40 lbs.
Complete 12 cyl. car ) 5910 lbs.
147½" wheelbase ) 3061 r.p.m. per mile.
  
  


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