"John Flanagan" wrote in message
...
On Fri, 18 Jul 2003 10:17:47 GMT, "Vaughn"
wrote:


"Walter Daniels" wrote in message
om...

Actually, I have been thonking about this since it first came up. A
mVW, or other small(sort of) *air cooled* engine, would be the best
base. Feedingh steam through the intake and outlet valves, while
venting through the spark plug hole.

The intake valve is facing the wrong way so this scheme would only
work
for very low steam pressures. Think about it; the valve spring would
have
to be strong enough to hold the intake valve shut against steam pressure.
That is why most such schemes put steam into the spark plug hole. Either
way, you really have to do some design work on the intake valve problem
to
make a practical engine, not as easy as just changing the cam.

I'm pretty sure you could ever get the engine to be a two stroke
without regrinding the camshaft no matter which way you do it. The
timing just isn't right. Intake opens on a downstroke while the
exhaust opens on an upstroke. You can switch this around but they'd
one would always be wrong.

Change the timing sprocket to 1-to-1, only use the exhaust valve, use
the exhaust manifold exactly the way it was intended, and you have fixed
much of THAT problem, but you are still left with the intake valve
situation; neither of the existing valves is really suitable for that job
because they are designed to hold pressure INSIDE the cylinder, not hold it
out. Perhaps an electrically-operated valve connected to the spark plug
hole?

Vaughn

Vaughn

John

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