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| AndyB:
Hi Tom, That is a real case of :proj: :bow: :jaw: I will be watching progress, especially as it looks similar to a bike that my great grandfather won a grass track race on at about the same time (he went on to build two racing Douglases, 'Otterzell' and then 'Otterstill' in the 1920's) Eric and John, thank you so much for the books. Andy |
| OKTomT:
Hi guys. I have been working on the cylinder head and the timing gears. This engine has a lot of crankcase presser on the down stroke and needs a case vent but the book said to just buy one. I would like to build a period correct one and am not sure where to put it. Have you got ideas on how to build this and where to install it. thanks Tom Here you can see the bosses installed in the case. The cylinder head still needs the fins cut and the intake and exhaust flanges installed. |
| John Stevenson:
Tom, Can you vent it into the timing case thru a hollow mainshaft and time it with a cross hole that opens into the timing side mainshaft bush on the down stroke. Some early Brit engines vented into the Primary chaincase to lube the chain. John S. |
| OKTomT:
John it sounds like a good idea to vent it into the timing gear case to lube the gears but it is also a sealed compartment . I take it that the vent should be a one way valve only venting on the down stroke? thank Tom |
| John Stevenson:
Tom, you time it by using a cross drilled hole in the main shaft that lines up with a groove in the bush so the hole only lines up with the groove on the down stroke. You could always fit a labyrinth breather in the timing cover. |
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