Tiny Super

[Ghosty]

Hi All,

I came across this engine in a set of Popular Science mags from 1946. Looked like a nice little engine

Made a start on the cylinder.

Cheers

Andrew

[Jo]

I love the early small engines and this one has character 

Jo

P.S. Its not that "Tiny" 

[Zephyrin]

Tiny, not that tiny with 1" bore & stroke !

I also did oldtimer engines from this magazine, I will follow this build.

[Ghosty]

Hi All,
Got some more of the cylinder done today.
Used an arbour to hold the cylinder, uses a 1/4" bolt with a 1/4x32 thread for the plug hole. I went with a 1/4" plug as the 3/8" plugs are getting harder to get, the 1/4" ones are readily available.
Machined the ports for exhaust and inlet. Set up in dividing head for the correct spacing.
Also machined the cooling fins, I like the look of the fins on the O&R engines, so I reconfigured the fins to suite.
The top of the head were machined with a 0.8mm slitting saw, and the cylinder fins with a 0.9mm HSS tool. Had to grind this one up.
Hope to get more done tomorrow.
Cheers
Andrew

[Ghosty]

Some More

[Admiral_dk]

Good looking cylinder 

You didn't show, but I presume that you made the holes for the transfer port in the same setup too 

Best wishes

Per

[Ghosty]

Good looking cylinder 

You didn't show, but I presume that you made the holes for the transfer port in the same setup too 

Best wishes

Per

Per,
The lower transfer port will be cut in the cylinder lower flange after the transfer passage has been fitted.
Cheers

[Ghosty]

Hi All,
Done more, I do not have any black iron for the transfer port, had a 3/4" copper fitting, good enough, formed up and silver soldered to cylinder, then cleaned up.
Remounted the cylinder in the lathe and machined a couple of thou under sized.
Mounted in mill and machined cylinder flange, drilled mount holes, and machined out transfer port.
Then lapped and honed cylinder to size.
Mounted piston blank in lathe and machined to size, and cut ring grove.
Marked out positions for milling. Mounted in mill, drilled and reamed piston pin hole, machined transfer port, machined transfer and exhaust deflector's, machined piston internals.
Cheers
Andrew

[Ghosty]

More pics.

[Ghosty]

A couple more

[Ghosty]

Hi All,
Not a lot done today, machined up the ring blanks and tooling to finish of the rings. Got several done.
Cheers
Andrew

[Ghosty]

Some more

[Roger B]

Are you heat treating your rings? There seem to be a number of different thoughts on this     

[Ghosty]

Are you heat treating your rings? There seem to be a number of different thoughts on this     

Roger,
There is no not of it in the plans or writing, steel cylinder. I may heat treat a couple just to be safe.
Cheers
Andrew

[Ghosty]

Hi All,
Got into the crankcase today, machined to size, marked out, drilled and tapped mounting holes, set in 4 jaw chuck and machined.
Cheers
Andrew