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Old 12-11-17, 02:10 PM   #31
wolseley phill
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Thanks for the comments, I suppose the Villiers carburettor is a bit large but from an engine with a similar capacity. I like the idea of a simple suction “mixer” which would be easy enough to make.

I favour a slide throttle at the moment, I stand a better chance of a good seal than a butterfly valve.

The cam doesn’t have to sit on the centre line but I thought it might look better and it makes it easier to mill/ drill a flat at the cylinder head end for a push rod support. Haven’t committed myself yet though, I walked away from the job at that point yesterday!

Will try and hurry up, I’d like to see it run too! Playing with rather bigger old engines at work and as such I’m not usually in a hurry to get away - a refreshing change.

Phill.
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Old 12-11-17, 03:00 PM   #32
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Can always use a finger type cam follower to position the push rod where you want it.

Don't hurry up, take plenty of thinking time between cutting - I often have 'oh, I should have done it like that' moments!

NHH
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Old 12-11-17, 03:31 PM   #33
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Quote:
Originally Posted by nickh View Post
Can always use a finger type cam follower to position the push rod where you want it.

Don't hurry up, take plenty of thinking time between cutting - I often have 'oh, I should have done it like that' moments!

NHH
Very true, I wonder if such a device could be employed to trip the ignition too...hmm, ponder, ponder...
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Old 12-11-17, 03:44 PM   #34
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Phill for inspiration on cams, gear trains etc. have a look at this bloke vids.
https://www.youtube.com/channel/UCY1...8m9ZoRpd7rgQCg

Neil.
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Old 12-11-17, 06:34 PM   #35
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Quote:
Originally Posted by wolseley phill View Post
(snip) I wonder if such a device could be employed to trip the ignition...
Since trembler coil ignition does not need a rapid make and break, a simple wiper arrangement usually suffices. Here's one I made earlier.

NHH
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Old 12-11-17, 09:08 PM   #36
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Thanks gents, a wiper contact was the kind of thing I was thinking of - with some kind of adjustment so that it can be retarded for starting.

I decided to leave the cam alone for the time being and get the cylinder head finished - I can work back from there. The other idea that hit me today is the use of an eccentric, like a Gardner. Much easier to machine than a cam..

The head has three ports as can be seen, inlet and exhaust; the third being an unloader valve.

IMGA0506 by Phillip Sheppard, on Flickr

Having spent some time looking for suitable valves and turning up nothing, I'll make them. Cutting of the valve seats will have to wait until the guides are made and installed, for now I've just drilled the head.

I chose the two ports which had the greatest clearance around them - the third will probably be blocked off. Having tried various things, I settled for bolting the head to the vertical slide and clocking it all at 90 degrees to the bedways. I used a dead centre to easily get the alignment - there are better ways, but it worked well. Helpfully, someone has at some time drilled and tapped holes in the slide, so the head was bolted down onto it's milled surface. I added the second clamp just to prevent any chatter but I think it was probably quite unnecessary.

IMGA0510 by Phillip Sheppard, on Flickr

IMGA0515 by Phillip Sheppard, on Flickr

IMGA0519 by Phillip Sheppard, on Flickr

Funny how a few hours can be whiled away drilling two holes...

Phill.
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Old 12-11-17, 09:14 PM   #37
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Superb work!

Dan.
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Old 13-11-17, 11:13 AM   #38
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Thanks mate.
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Old 13-11-17, 09:49 PM   #39
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Great work Phillip - It has been nice reading your progress with this project just now. It has been a while since I was on the Forum, so just been catching up
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Old 14-11-17, 09:53 PM   #40
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Thanks Kev, glad my ramblings are of interest!

I took the engine into work today to seek a few opinions on valves. One of the guys who used to work in the engine shop happened to drop in and just happens to have a Honda Cub 50 (as per valve suggestion in earlier posts) in bits at the moment. Helpfully, he measured the valves and phoned later, but unfortunately the valve head measures 20mm and my engine will accommodate a maximum of 15mm.

Having a spent a while looking again this evening, I've ordered a pair of valves from a Chinese moped that should fit.

Phill.
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