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2 Cylinder, 4 cycle, 3/4 bore X 5/8
stroke, Glow ignition
the engine was built using plans only without
building instructions and it was my first ever engineering project. I took up
miniature engineering as a hobby at the age of 50.
The engine is a 9cc V twin aero engine, 4 stroke,
glow plug ignition, which has splash lubrication of a ball bearing at the rear
of the crankshaft and a plain bronze bearing at the front.
"Ready to Burn and Turn". It is the culmination of
three years work.
It is made entirely from bar stock and the only
items I have not made myself are the valve springs, bolts, nuts and glow
I hope to try and start the engine soon. If it
fires I shall be pleased, if it runs I shall be delighted, if it does
neither , I shall drink the celebratory champagne and section the engine to
show school kids how a 4 stroke engine works ?
The two conrods share one big end and there is a
counter balanced lobe on the crankshaft.
As you will see from the e-mail I previously
posted, each piston has two piston rings in one piston groove and althought
the drawings appeared to require a piston ring end gap of .110" I now know
that it was wrong to make them that way because I had miss understood the
plans and the .110" is in fact the gap they should be held at whilst heat
Construction of the engine posed a number of
problems for a beginner such as me, not least the use of a parting tool to cut
the fins in the steel cylinder, the accurate machining of the camshaft gear
case with its numerous shaft holes and the need to ensure the gears meshed
More picture to follow
4/6/2003 More images
Copyright 2003, Florida Association of Model Engineers
and engine builder as noted above,
All rights reserved.