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3-bearing engine - Magazine Cover

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3-bearing engine - Magazine Cover
Tony Griffiths Offline
First Grey Mag editor
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Joined: May 2018 Posts: 2,978 Threads: 560
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Location: Peak District, Derbyshire
Car type: 1929 Chummy, 1930 Chummy, 1930 Ulster Replica, 1934 Ruby
#1
29-03-2020, 12:51 AM
A clear - if rather perfunctory - sectional drawing of a 3-bearing engine from 1936.
Click the image for a clear version - and click again for an enlargement or to copy.


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http://lathes.co.uk
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Bob Culver Offline
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Location: Auckland, NZ
#2
29-03-2020, 01:44 AM (This post was last modified: 29-03-2020, 01:46 AM by Bob Culver.)
Is anyone still running the original pattern wide rings? With them oil consumption on my car was for a period  almost nil. When it reached 1 pint in 800 miles my father thought ir was due for overhaul!!
Was there ever an engine wiht a less rigid centre bearing? ThebBig Seven was the other extreme.
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Chris KC Offline
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Location: Darkest Bedfordshire
#3
29-03-2020, 12:24 PM
Nice picture, thanks for sharing.
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Ritchie Wilson Offline
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Location: Christchurch NZ
#4
30-03-2020, 02:53 AM
Bob, Jack Cotton had a scheme for reinforcing the centre-main and making the 3-bearing crankcase less liable to flex by bolting an aluminium casting to the base of the crankcase where the mesh is usually.
A diagram was in one of the 750 Club Bulletins and is reprinted in "Design for Competition" (1966).
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Jamie Offline
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#5
30-03-2020, 07:26 AM
(30-03-2020, 02:53 AM)Ritchie Wilson Wrote: Bob, Jack Cotton had a scheme for reinforcing the centre-main and making the 3-bearing crankcase less liable to flex by bolting an aluminium casting to the base of the crankcase where the mesh is usually.
A diagram was in one of the 750 Club Bulletins and is reprinted in "Design for Competition" (1966).

Would anyone, by chance, have a copy of this which they could post here, assuming that copyright is not a concern?

Jamie.
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