Rog,

There are a lot of engines I don't have...running out of places to put them. I also collect Diecast cars..talk about using up space...and N-scale trains.

One of these days I'm gonna have to start selling stuff on E-Bay.

I've seen a lot of positive comments on the Thunder Tiger .07 on "Smallnet" so I can assume it's a pretty good engine. There seems to be more support here for the Norvel .074.

I'm betting they are both nice little engines. Like I said the TT seems to have a lot more metal in the muffler and mounting flanges which makes me think of unnecessary weight. Just looking at the two engine designs, the Norvel seems to be of lighter construction. Does anyone know the weight of these two engines. Whoops I have a diet scale....the Norvel weighs avout 3.4 Oz .... if the scale is accurate.

I'd like to see a head conversion for a standard glo plug but make the bottom of the plug hole "Blind" so the combustion chamber is smooth.

Diesel conversions provide more torque on a larger prop but RPMs will usually drop off when compared to glo. Diesel guys get a certain satisfaction out of understanding and running them.
Over the years I've seen a lot of guys tear their hair out trying to run diesels, so It's sort of an elite brotherhood of guys who can live with the diesel characteristics.

I like diesels but you have to make sure your exhaust is routed away from the model or you end up with an oily mess. They do run quieter than a glo engine and are usually more fuel efficient. I would recommend newcomers to stick with the glo engines and then learn diesels later on if they like to tinker.