In message
, JimK
writes
ah you need an old Petter PH1 air cooled single cylinder diesel, runs
for weeks on a gallon of the cruddiest disel you can imagine - mind you
0-60mph might be a while coming up tho....

Ah a psychic at work. Had an air cooled single cyl Petter in the boat,
followed by a water cooled one. Super little mend it yourself engines,
all parts available, the water cooled one used standard plumbing parts.
In the search for more power, tracked down and spoke to the Petter's
designer, lovely, very helpful man, disgruntled that the legacy and
market had been thrown away in the Lister (Hawker Siddeley?) takeover.

Sadly, we are now on a 2-cyl Mitsubishi.

Who needs speed?
--
Bill