Hello folks,
I couldn't find a group for nitro cars or trucks so I figured I might ask the question here as the issues I'm having are with the motors themselves.
I am relatively new to the hobby but have been an auto mechanic for years and years, so familiar with all the pieces parts and what they do.
My question: I have two motors that will not start. They are getting fuel and heat from the glow plug/ ignitor (both tested on another working motor) and the carb is set to factory default. I have them bench mounted and trying to start using a drill adapter on the starter bolt. They are getting fuel and heat, but I think compression might be a problem.
How much compression should these little guys produce? My compression gauge doesn't have an adapter that small so I can't give a number. As it is now, with carb wide open and muffler off, with the head removed and my thumb over the cylinder opening, I can keep my thumb firmly over the hole while turning at 50 RPM or so. I can feel more suction than compression. There is a little bit of compression, but not much.
Shouldn't this thing blow my thumb right off the hole on the compression stroke? FWIW, Megatech M16, 1.15HP. One motor was "new", the other used of unknown hours.
Thanks in advance!
Doc