Peter,

I am trying a similar thing. I had a friend make me up an adapter that allowed me to replace the spark plug in a Zenoah G62 with an OS #8 glo plug.

I have not yet built an aircraft for this engine but I anticipate installing it in a bi-plane.

It runs with plenty of grunt on 10% synthetic oil 90% methanol and no nitro.

I would be interested in hearing what percentage of oil other people are using in these gas to glo conversions.

Has anyone tried using 5% acetone in place of the nitro in a Zenoah engine? I believe that the makers of the Tartan Twin used to recommend this substitution.