Hallo Allen,
I have seen your question about the plans for the Boll Major 4,4 cc model diesel engine.I have plans left in bad condition,but the designer Chris Boll in the U.K. can help you out i am sure he's willing to service you with the plans.
His e.mail adress is
[email protected] so an e.mail to him will show you that he will help you and if he has no posibilities anymore you can contact me again and will see what i can do for you.You can write that you got his e.mail adress from me if you like.
My Boll 4,4 is on youtube indeed i am Gerard and my engine runs very sturdy with he high torque output i could hardly hold it.I could hold it at a low RPM and it ran already in 3 runs for at least 2 1/2 hour of running time.
I do have a number of threads on this website about making them.
Comming back on Chris he has now developed a Boll 49 8,02 cc model glow engine a big one you can see the making from that engine as well on one of my threads.I made the engine also sucessfull now it has to run ,but fuel and many neighbours in my area in this very small country make me do this only now and then a year.
Chris is doiing a serie articles in Model Engineer magazine(s) at this moment also about making that particular glow engine.
I hoping that all this info was of any use to you Allen?
many greetings from modelmotor-Gerard -The Netherlands-Europe.