I think it time to address theconfusion between a purpose built diesel and diesel conversion of a glow engine. Diesel engines were developed in the late 30's but didn't come into their own until lthe post WW IIperiod. The domminant engine was of course the gasoline engine as glow doesn't come on the scene untill 1949 just as diesel was starting to make some inroads in the American market. At the time gasoline engines were very lightly built and many of them didn't do well on the glow plug and some companies like O&R were put out of business since they could not stand up to the added power and thus stress brought about by the Glow conversion. At that time diesel engines were more heavily built.
Fast forward to the 1970's and the advent of the schnurle ported and the ABC model engine. Very beefy designs for the added power and that is when we came along with diesel conversion.If you take the back off a model engine from then to now andconpare it to a post WWIIdiesel design you will see the added beef residesin the Gow schnule ported engine. If we were doing it wrong then why did the following companies follow our leed , Irvine, MVVS, Enya dieselizing their glow 20's through .61's.

I trust this will put this matter to rest for awhile.

BoB Davis