Three Cylinder Radial Engine

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raynerd:
Stew, a really smart and well written bit of machining! Even I understood it all..... well ok, most of it!

:clap: :thumbup: :clap: :thumbup:

sbwhart:
Nick It'll sound Prrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr

John Built one a few years ago and he showed me a video of it running I can't remember where though :scratch:

Stew

bogstandard:
Mine sounded like a muffled ic engine, no vids left only a couple of piccies.

But Stews version will be different to mine as he is using a different cylinder setup, whereas mine was all integrally cast, Stew is using external porting tubes, which IMO will look a lot better.

John

sbwhart:
Having slept on it I decided to take some of the meat off the cylinders before I made the liners.

So first job turn up a mandrel thats a nice slide fit on the cylinders with a M12 thread.

Like this

This required some quite heavy cuts and I was a bit concerned the liner would come lose, so decided to get rid of quite a bit of the unwanted material before fitting them.

Then turn down the 35 mm dia sash weight down to 19.25 to give a 0.02 mm interferance fit in the cylinder and part off to length.

Then set back up in the lathe, again concentricity with OD not that important, centre drill and with increasing in diameter drill rough all three out, then they were set back up to finish with boring bar at the same cut so they all ended up the same size.

As I'm going to use the mandrel again to finish off the machining its easyer if they all have the same size bore. The actual size of the bore is not that important, I'll just make the piston to fit, its easy to work to an accurate OD than it is a ID, what's important with the bore is that its parallel and the finish is reasonable.

I just gave the liners a polish to give them a square start into the cylinder, then with a bit of high strength loctite they were squeezed together using the vice as a press.

And her we are all three liners assembled to the cylinders.

I give the loctite 24 hrs to cure before I do any more machining to the cylinders

Cheers

Stew

bogstandard:
Stew,

If you need it, I do have some very nice ali or brass tube that you can use for the transfer ports on the head.

Those cylinders do look very tasty. I have some of the fine cutters left over from the Halo cylinders if you want to do some finning.

Any problems with the very old cast iron?

John

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