On Jun 12, 9:21*pm, Dan wrote:

* * The VW engine idea sounds interesting. Any suggestions where to find
plans? I don't think Id build one, but it should be an interesting read.
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There used to be a company named 'Dunn-Rite' (sp?) which supplied a
conversion kit, but the idea dates from the 1930's and the conversion
of anu I-4 or V-8 engine for that purpose. The VW is especially easy
to convert and the DIY method has been explained several times on VW-
specific Groups. Basically, you simply select a pair of sequenctially-
firing cylinders as your power pair (ie, 1-3 or 2-4) and use the other
pair as your 'pumping' cylinders. The spark plugs of the pumping
cylinders are modified to act as ball-type check valves while the
exhaust stack is modified to become an input valve by the use of a
flapper valve made of light-gauge spring steel. The push-rods &
rocker arms of the pumping pair are modified so as to always be
open.

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* * I would imagine such Navy machines would be a ta
d noisy. I have
never had the pleasure of hearing a rivet gun used in building large sea
going vessels. I have the feeling it also would be a bit loud.

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Actually, they sound remarkably like welding machines :-)

(I don't think the Navy hasn't used riveted hulls since the 1920's)

-Bob