Crank Diameter

Crank Diameter

This topic has 2 replies, 2 voices, and was last updated 16 February 2011 at 05:21 by John Olsen.

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15 February 2011 at 21:26 #64155
Alan Worland 1
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@alanworland1
I am machining the crankshaft for a Stuart Turner No 4 the drawings of which suggest the main bearing and big end diameter is 7/16

There is plenty of material to come off that I have decided to make these bearing surfaces 0.500 – the main bearings and big end will accomodate the extra.

Has anybody else done this and might there be a problem I have not thought about?
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15 February 2011 at 21:26 #3083
Alan Worland 1
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@alanworland1
16 February 2011 at 05:21 #64171
John Olsen
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@johnolsen79199
It will not cause any problems, and is a good idea if the engine is likely to do any hard work. The Stuart engines generally are semi-scale, eg they are not scale models of a particular prototype, but are proportioned as if they were. So the journals are smaller than they would be if the engines were intended for hard work.

regards

John
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