stunthanger.com

Engine basics => Engine set up tips => Topic started by: frank mccune on October 04, 2014, 11:26:51 AM

Title: Old McCoy .29 Rear Valve engines stunt engines?
Post by: frank mccune on October 04, 2014, 11:26:51 AM

      Hi All:

      While 'cleaning" my attic today, I found several old McCoy Engines.  These are probably from the late 40's or 50's as they have plain cases with the venturm turned at about a 45 degrees pointing in an upwards position.  They also have a single ring and they have never been run.  Some are marked Sportsman on the case and the .36 has the intake straight out of the backplate.  My question is this.  Will these engines be suitable to use as sport engines.  I have a few planes already built that they may be installed.  If need be, I could send them out to have a new ring installed but with an electric starter. I think that I may be able to get them running.

      I did run a .19 engine of the same design and it took an electric starter to get it to tun.  The compression appeared too low to permit hand starting.  Once running, it ran very smoothly but did not have an great amount of power as compared to newer engines.

     I just hate to see these engines never see the end of a set of control lines.

    Thoughts or suggestions about this idea?

                                                                        Tia,

                                                                        Frank

Title: Re: Old McCoy .29 Rear Valve engines stunt engines?
Post by: EddyR on October 04, 2014, 12:10:16 PM

I ran those motors .29 and .36 back in the early 1950's They will pull a light Ringmaster. One guy had one in the early veco Tom Tom with built up body. I believe Frank Bowman the ring guy has rings for them.
Ed

Title: Re: Old McCoy .29 Rear Valve engines stunt engines?
Post by: FLOYD CARTER on October 04, 2014, 04:50:25 PM

Yes.  In the early 50's, we used the McCoy "Sportsman" engines, along with the Torp 29.  The McCoy types ran well and were reliable.  You should get better compression after the engine is broken-in some.

Floyd

Title: Re: Old McCoy .29 Rear Valve engines stunt engines?
Post by: Jim Kraft on October 04, 2014, 08:08:56 PM

Floyd is right. I have a McCoy 19 bump lug rear valve that was new when I got it. It took quite a bit of running before the ring seated and it now has great compression. It hand starts on one flip almost every time.

Title: Re: Old McCoy .29 Rear Valve engines stunt engines?
Post by: dennis lipsett on October 10, 2014, 04:30:31 PM

Quote from: Jim Kraft on October 04, 2014, 08:08:56 PM

Floyd is right. I have a McCoy 19 bump lug rear valve that was new when I got it. It took quite a bit of running before the ring seated and it now has great compression. It hand starts on one flip almost every time.

I used to give it a squirt of light weight oil and then a prime to start the old McCoy Sportman engines. Of course when I got them the engines were shot (about 1955) and needed something to give it some compression to start them. Interesting to see the prop free wheel a few turns when the engine stopped.

Dennis