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Poppet Valve Engine - Crank

|Crank | Crankcase | Cylinder | Cylinder Head | Cylinder Liner | Flywheel | Spark Plug | Timing Gears

Nigel Taylor

Three views of the crank, note the centre drill at each end for later location.


The crank was reversed in the chuck, turned and then flycut in the mill.


The webs of the crank are just wide enough to still fit a 3-jaw chuck.


Re-aligning the crank in the lathe allowed me to later machine the bearing surfaces to size.


At last the crank can then be fitted in the crankcase with the two ball-bearings in place.

The rear bearing is quite large and so gives good support to the crank.


My only issue with this crankshaft is the nose is rather short.


Index Page for the Poppet Valve Engine

If you have made a similar engine and would like to share your experience we would love to hear from you - ed.