ABC engine or ringed engine??

[animalshortening]

Hey guys. I have this enya 15-IV engine that i got from a garage sail and know nothing about. My main question is whether its an ABC or ringed engine. Also, How would I tell the difference between a ringed or ABC engine visually?

 

[mjmccarron]

If you remove the muffler and look into the exhaust port you can see the side of the piston. Rotate the engine slowly until you see the top edge. A ringed engine will have the ring visible at this point. An ABC will have a solid piston. However, I believe that the engine you have is a "lapped" type. It's similar to ABC but has a lapped piston, usually aluminum in an iron sleeve. In any event, keep your nitro low at first 10 - 15% and it should be a good runner.

Here's a link to some good info regarding your Enya:

http://www.rojobcn.com/catalogos/enya2006/enya200601.pdf


Good luck,
Mike