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Old 26-09-17, 07:25 PM   #1
wolseley phill
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Default Hit and miss compressor

I spotted this Brunner air compressor for sale at Kingsfold and bought it, very cheaply too.

I'm quite taken with the idea of turning it into an engine - there are a number on Youtube based on these compressors including a hit and miss side shaft engine.

IMGA0047 by Phillip Sheppard, on Flickr

IMGA0051 by Phillip Sheppard, on Flickr

IMGA0054 by Phillip Sheppard, on Flickr

It currently has poppet valves so I'd replace the cylinder head - pleasingly the bore appears unworn.

IMGA0054 by Phillip Sheppard, on Flickr

The crank runs in the iron casting, there is scoring but no detectable play.

IMGA0056 by Phillip Sheppard, on Flickr


I'm not feeling great enthusiasm for the Stuart Turner projects at the moment - given how much I enjoy using the lathe, this will be an enjoyable diversion and something different to show next year.

What I will need is a flywheel for it, the crank measures 0.935"/23.75mm and the hub could have a depth of 2" at most. If you have anything suitable, please let me know - a smaller bore hub would be preferable to one larger than the crank.

Phill
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Old 26-09-17, 07:32 PM   #2
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Potential for a Loyal cycle engine with a bit more visual appeal than the Engineer's Emporium "Pioneer"?

NHH
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Old 26-09-17, 09:04 PM   #3
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I was thinking more along the lines of a conventional four stroke, probably hit and miss but a throttle governed side shaft engine is also quite tempting - I'll see where it goes.

The Lloyd cycle is an interesting thing though! A Paradox engine replica has also been suggested. The Engineers Emporium do sell some suitable flywheel castings, if nothing ready machined turns up I'll use one of those.

Phill.
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Old 26-09-17, 09:20 PM   #4
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You could always leave it as a nicely restored open crank compressor.

Martin P
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Old 26-09-17, 10:04 PM   #5
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Quote:
Originally Posted by Lister M View Post
You could always leave it as a nicely restored open crank compressor.

Martin P
Stuart Turner powered and sitting on a small tank

Neil.
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Old 29-09-17, 11:08 PM   #6
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Made a start on this tonight, having thought out a few of the details during the week. The scrap bin at work produced a suitable chunk of steel for the cylinder head and a lump of ally to make a compression lowering ring.

Can anyone help with a pair of inlet /exhaust valves please, from an engine around the 50cc mark would be very suitable.

Thanks,

Phill.
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Old 01-10-17, 10:05 PM   #7
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Quote:
Originally Posted by wolseley phill View Post
What I will need is a flywheel for it, the crank measures 0.935"/23.75mm and the hub could have a depth of 2" at most. If you have anything suitable, please let me know - a smaller bore hub would be preferable to one larger than the crank.

Phill
Hand wheel of a union drill might be a cheap option they are heavy enough!
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Old 02-10-17, 05:52 PM   #8
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Hot tube shouldn't be a problem as you would make it so that it could be screwed in the place of the plug, and f conditions don't allow hot tube running then simply remove it and refit the plug and carry on on with ht ignition.
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Old 03-10-17, 12:27 AM   #9
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I'd go for hot tube too, doing away with the need for a mag and setting up timing etc. Also a rotary sideshaft with a "face-cam" to operate the exhaust valve, and throttle governing to do away with a hit and miss latching system, which would be very fiddly on such a small engine. Believe me, I know!!!
With Your skills I bet You could make a super little flyball governor!!
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Old 16-10-17, 09:39 PM   #10
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The plan is to keep the engine as simple as possible, it's been pointed out to me by several people that the small size of the engine will probably make it more than slightly erratic if built as a hit and miss and I think that's very valid. To begin with, it will be built as an ungoverned four stroke. Once satisfied with the running, some form of governor can be designed and added. The idea of a belt driven flyball governor appeals to me.

The compressor has finally been completely dismantled, the crank looked a bit of a mess but pleasingly the bore and piston are unworn.

IMGA0285 by Phillip Sheppard, on Flickr

The crank has cleaned up for a bit of a polish - for what this is, I'm not worried. If the thing turns out to be a rip roaring success then I'll look at making some proper bronze or white metal bearings - the crankcase is small enough to bore oversize on the lathe and the crank could be undersized a little. The pulley had obviously slipped at some time, wearing that part of the crank - a light skim has made it round again!

IMGA0290 by Phillip Sheppard, on Flickr

A stub has been turned on the back end of the crank, this is to drive the cam.

IMGA0291 by Phillip Sheppard, on Flickr

The shaft will have a keyway milled for the gear.

IMGA0293 by Phillip Sheppard, on Flickr

IMGA0294 by Phillip Sheppard, on Flickr

The piston is remarkably well made compared to the rest of the compressor.

The bolt in the foreground is the first of the new head bolts, 5/16" ANC. The thread was machine cut but I found it necessary to finish with a die, two more to make now.

IMGA0295 by Phillip Sheppard, on Flickr

Phill.
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