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Continous cast iron bar is readily available in the UK dunno about the States but it is very uniform in construction and grain size.

Nice job. Will this engine have a low cr to enable smooth low speed show operation.

Why not make a scale sized rotary vane motor running from a Co2 bulb or high pressure air which will give plenty of torque especially geared down. Brilliant work so far sir.

I would hone/lap the bores to size first after finishing the o/l. Placing the finished bore on a close fitting expanding mandrel or a threaded and bolted one to ensure concentricity. Working prevoiusly at a company for 20 years making liners from 2" to 24" bore this type of machining operation...

May I say the cogging action is the sticksion of the valve stems when tying to open and being acted upon at an angle overcoming the initial valve spring load. Try a small smear of motor oil on the stems before assembly. Running in carefully will loosen things up with adequate lube. Heavenly work...

Bloody marvelous

Only boring to those who dont visit this site!

For the miter gears have you tried HPC gears here in the UK. If you did machine them yourself a running in oeriod in a jig at the set depths using a little metal polish to allow each gear to bed into each other.

More,more.

Very skillful indeed. Well done.

Nice vehicle to model there. Big question will you be doing the engine as scale with diesel or opting for petrol with scale parts.

I would have loved to shake the mans hand who made the patterns for these amazing castings. Love the patience for straightening those casings. Great work.

Nice prototyping there Alex. Inspires me in my diesel build with this sticky area.

I have made a CAT 3406e engine @ roughly 1/6 scale and is work in progress. Its very hard to obtain drawings n such to make an accurate copy of such an engine. Look up my old thread. Good luck.

Considering the scale and the time spent machining this is a very good start indeed. For the rods I would make em from either ally or brass so it gives some good bearing action.

Definitely a torque monster. Self starting is well taken care of eh.. Nice work.

Very professional.

I have sympathy with you on the drill breakage and the easiest and safest is the spark erosion way. Hows about gearing up a small impellor in a timing case set up at 1:10 to start with giving 10x engine speed at the impellor illiminating the volumetric losses. It coukd be done in a very small...

It looks to me that the crankcase has far too much volume to create any pressure for the transfer ports to work properly.

I can almost hear it ticking over slow and sweet n scale like! :cool: