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EVguru
10-27-2009, 11:37 AM
http://www.realclassic.co.uk/techfiles/tech03122206.jpg

http://www.realclassic.co.uk/techfiles/tech03122207.jpg

1920's Humber motorcyle engine all machined from scratch except the rod and big end rollers.

Bob (Humbernut) has sidevalve, OHV and OHC versions of the bike and has had to make pistons and rings, rods, crankcases, etc. It's his fault that I spent so much money on a cylindrical grinder!

More info http://www.realclassic.co.uk/techfiles/tech03122200.html

The sidevalve bike.

http://www.realclassic.co.uk/humber03102901.jpg

Carld
10-27-2009, 11:50 AM
It looks like the crankcase is cast to me.

JBL37
10-27-2009, 11:50 AM
Paul: A real labor of love. Thanks for sharing. Jim

EVguru
10-27-2009, 11:52 AM
It looks like the crankcase is cast to me.

Machined from billet and sand blasted.

x39
10-27-2009, 12:32 PM
Amazing job. Where does a guy find the time to undertake a project like that?

EVguru
10-27-2009, 12:52 PM
Amazing job. Where does a guy find the time to undertake a project like that?
Bob is (was) a contacting oil-rig engineer. He'd spend a number of weeks off-shore (doing jobs like extracting broken drills from the well and fixing other equipment) and then spend several weeks on shore.

He's expanded his workshop to the point where he offers his services to the motorcycling community. Just now there's little rig work, so he's doing more on the motorcycle side.

Picture of the OHC engine
http://www.realclassic.co.uk/techfiles/tech04121005.jpg


I used to push the capacity limits of my Boxford sometimes, but I think Bob was coming very close to what's possible on a Myford when making a new barrel;http://www.realclassic.co.uk/techfiles/tech04022300.html

x39
10-27-2009, 06:02 PM
Bob is (was) a contacting oil-rig engineer.
He is obviously an immensely talented guy.

Alistair Hosie
10-27-2009, 06:14 PM
Yes I was just going to say he's a good engineer thanks for showing.I dream of being able to work like that.:DAlistair