Single Cylinder 4 Stroke

[Nigel (egi)Participant @nigelegi]

This is my own design, it gets parts built, gets put on the shelf, I build some more, it goes back on the shelf. At the moment it's on the shelf as something else has priority, but I thought I would talk through building it up and the design.

Hopefully this might inspire others to have a go at designing and making an engine.

[Nigel (egi)Participant @nigelegi]

a 4.3cc 17mm bore 19mm stroke engine

[not done it yetParticipant @notdoneityet]

Looks good, so far.

I’m wondering about lubrication as you appear to be using sealed bearings.

Also, how fast do you expect it to rev? Presumably not very fast as I suspect an atmospheric valve will be a limiting factor?

[Nigel (egi)Participant @nigelegi]

Posted by not done it yet on 05/03/2021 17:37:12:

Looks good, so far.

I’m wondering about lubrication as you appear to be using sealed bearings.

Also, how fast do you expect it to rev? Presumably not very fast as I suspect an atmospheric valve will be a limiting factor?

Thanks.

There will be oil in the crankcase – small amount. The front bearing is similar to what you would see on a commercial glow plug engine. The rear bearing is a bit odd in size due to the location of the gear on the crankshaft. I might yet remove the bearing shield from one side.

I'm not expecting it to rev very fast. At the moment I would be happy with a tickover.

[JasonBModerator @jasonb]

Should be good for at least 3000rpm, Engines I have made with atmospheric inlet have given performance figures for those sort of revs

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