Cam gear on Bobcat

[Bengt OParticipant @bengto]

In the first issue of the BobCat construction series, it's three gears in the Bill Of Material 12, 24,20, how does this work

KInd Regards ,

Bengt

[Bengt OParticipant @bengto]

[David Clark 13Participant @davidclark13]

Hi There

Without checking,

I would think 12 on crankshaft, 24 on camshaft and 20 as an iddler.

Four strokes need two to one gearing so that is the 12 and 24.

Idler can be any convenient number of teeth so 20 it is.

[JasonBModerator @jasonb]

Whats the question?

Gear details are given on page 302 and as david says 12 on the crank, 24 on the valve and a 20 idler to give the spacing required.

J

[Bengt OParticipant @bengto]

Sorry, I forgot my brain somewere. I got it now.

Kind regards Bengt

[Sub MandrelParticipant @submandrel]

ETW once wrote of how he had striuggled to try and get someones version of one of huis designs to work for ages, without success. In the end he tried to reset the valve gear and in doing so he discovered it had (something like) a 20 and a 39 tooth gear. the maker said "it was all I had, and I thought it would be near enough".

Neil

[Mike WainwrightParticipant @mikewainwright87512]

David

Any news on the materials list for this engine. It was mentioned in another post but have not seen a reply yet

Thanks

MIke

[Ian S CParticipant @iansc]

I would have thought that an uneven number for the idler would have been better for wear, ie., 19 or 21, but it proberbly of little concequence on a motor that is going to have fairly low running hours, (not thousands), just seem to remember some where in the past reading something about this. Stick to the drawings, my ramble over. Ian S C

[David Clark 13Participant @davidclark13]

Hi Mike

No materials list available.

However, Crankcase etc HE30

Conrods HE15

Piston HE30

Steel parts EN1A

Crankshaft EN1A or EN8

Flywheel mild steel or brass.

Cams mild steel case hardened.

regards David

 

 

Edited By David Clark 1 on 12/09/2012 10:36:44

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