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Click
on a picture for enlargement |
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Norton
Camshaft Engine Evolution - Line Drawings |
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I thought it might be interesting
to show the evolution of the Norton camshaft engine, using contempory
line drawings. Many of these were published by the weekly motorcycle
magazines of the time (The Blue 'Un and The Green 'Un) and were of very
high artistic quality. They chart the history from the earliest Walter
Moore CS1, right up to the last production Manx. |
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Where it all Began - Original
Walter Moore 1927 CS1 Engine
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The 1929 Olympia Show Arthur Carroll engine,
which used the Walter Moore top half. No one was ever sure if the
engine had any insides!
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1930 Carroll Engine - this was the engine that
started it all!
Note the coil valves springs, and the lack of a oil pressure relief
and oil filter bolt in the timing case.
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1935-36 International road based engine. By
this time fitted with hairpin valve springs and filter in base of
timing case. Downdraught TT carb (brass at this time) indicates Model
30 rather than CS1, but mag/dynamo shows it is a road going model
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Same engine as above, used in 1936 Castrol
advert, or is it? Note coil valve springs in this picture
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Selection of Works camboxs from 1935
Top : Enclosed rocker SOHC cambox, I gather this was used on works
bike and fooled press that DOHC was being used
Middle : Original Works DOHC cambox. Not a total success at first
Bottom : Another enclosed cambox. This version appears in a photograph
of a Works 350 in my photograhps section
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1937 Works DOHC Engine
This was the start of the twin cam Manx engine, although it would
not be available to privateers for another 13 years
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1950 Works DOHC Engine. Note that the crankcase
shape of this engine had changed substantially from 1937 engine and
has a much deeper sump and taller barrel throat. 1950 was first year
of the Featherbed frame
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Making an interesting comparison with the Works
engine , this is the 1950 Production engine.
Obvious difference is the additional finning on the Works head, increasing
airflow in the hottest areas
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Another interesting engine from 1950. This
time a Works experiment with a Rotary Valve head
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1954 Works Engine. This was the last year of
the works team and pretty much the ultimate development of the Manx
engine (exluding the unfinished prototype laydown Manx, now completed
and residing in the Sammy Miller museum). Note external flywheel
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1957 Production Engine. Shorter stroke by this
time, but still using Oldham Couplings to drive the camshafts
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1961 - Final development of the Production
Manx engine, using coarse bevel gears and Oldham Couplings replaced
with splined shafts
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Could not resist this one!
This is actually a drawing of a proposed 4 cylinder Works engine,
meant to replace the Manx in the early 1950's.
According to the late John Griffiths, castings still existed until
the early 1960's
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Return To Top of Page
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Return To Top of Page |
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