Originally Posted by
RichardGee
I acquired a Fox .29 RC just like the one pictured. [...] After trying many, many things, I finally took the engine apart and discovered the sleeve had been installed 180 degrees wrong... exhaust ports on intake, and visa versa! [...] Anyway, after correctly positioning the cylinder sleeve, the engine started and ran very well.
I had a similar problem with a K&B .35 Stallion engine of the 1960's I bought on an Internet auction. It displayed sub-port injection (SPI), piston skirt had a gap at top dead center. Someone installed the sleeve 180° wrong. Cut me new cylinder and head gaskets, installed it correctly. Now I had a very low time engine, bought it for a song. No wonder a previous owner had no luck with the engine.
Originally Posted by
RichardGee
The engine appeared to have never been run, so it is a mystery to me as to HOW this might have happened? Since Fox test ran all engines at the factory, again I wondered HOW..?
It's hard to say, but I am sure there is a story there. Something happened out of the ordinary.
Originally Posted by
Cougar429
Interesting find. A bit before my time so went looking for info.: These were apparently sold through the 60s - 70s. The reports show a pretty well developed carb for that gen. Any manual? From what I found it ran a max up to 5% nitro, so would likely avoid anything higher. Also, looks pre-Schnuerle. With the offset plug would think that is the case. Also, with those bosses and lack of exhaust baffle it appears there should be a muffler option. Would be interested in what that looked like. Found pics of one with a home made dual stack, but no muffler yet.
I bought one of the last runs of the Fox .25 R/C cross scavenged (non-Schneurle) engines from Tower Hobbies in the late 1990's. It's muffler mounting lugs are set up like the .29 but the up and down holes on the middle of the exhaust port are not drilled and tapped. It would not surprise me that I could probably use the muffler off my .25, got it packed away, so can't do a check.
This .29 R/C has the newer muffler mount lugs on each side of the exhaust port toward the rear. Fox made this change as the above and below mounting system in the middle of the exhaust port was weak, easier to damage the engine in a crash. So this .29 was one of the later ones. This photo for the .25 is probably the muffler that the .29 used:
From Jan-1982 Aeromodeller Magazine, Fox .25 R/C Engine Review by Peter Chinn obtained from https://sceptreflight.com/Model%20En...2025%20RC.html
Sceptre Flight Engine Tests does not have an article on this particular Fox .29. It's carburetor is a little earlier than the MK-X that is on my .25. My guess is the Fox .29 R/C from the 1970's, probably the last of the series. My Fox .25 R/C has the later single piece cast aluminum streamlined shaped muffler.
I don't have a manual for the .29 R/C, else I would scan and share it.