Today I found what looks like an old testors engine. But  it has no apparent motor mounts and the needle valve comes out the back of the crankcase.

I personnaly love the Testors pipe bomb engines.  Yeah, I know, it's really only a pipe bomb engine if it has the pot metal case.  I call all the Fly Em' engines pipe bomb engines.  A stock pipe bomb will give performance on par with a Cox Babe Bee engine.  With a Cox rubber ducky 5x3 prop, I find I get between about 13,900 and 14,700 RPM using the standard Testors plug and 25% nitro.  I've never run these with the Testors props, so I can't tell you how they perform with those.  Also, I wouldn't prop these above about 16,000 RPM.  I've heard from a member on another forum that he broke his crank running it up that high.  Again, I don't know this for sure, as the props I've used in the past haven't broke the 15K barrier.

There are no commercial engine mounts, nor any convenient way to modify a commercial mount.  I have made several mounts of my own for these.  Some complicated, a couple very simple.  Depends on what you want to mount these to.  Here's a quick motor mound I slapped together in about a half hour.  Just needed something to test a pipe bomb engine that I had just cleaned up and cut the tank back off of.  I forgot to recharge the battery on my camera, so you don't get to see em lean the engine out.  I think this is the one I was getting 13,900 out of:





You need to keep the plane weight below seven ounces to get any real pep out of them.  They will fly a plane of up to around 10 ounces.  That's the largest plane I've flown, but it only did roundy-roundy:





And for all you guys who think these engines are gutless wonders, I'll gladly take them off your hands.

Mark

http://sceptreflight.com/Model%20Engine%20Tests/Testors%208000.html
http://sceptreflight.com/Model%20Engine%20Tests/Testor%208000%20%282%29.html

Photos are from above articles, Peter Chinn said the following in Aeromodeller (not in the links although links state similar, I downloaded article from another source 7 years ago but not sure where): On test, the 8000 was found to be considerably more peppy than the Testor McCoy 049 engine that it replaced and our particular example (which came direct from the factory in the U.S.) reached a peak output of approximately .094 bhp at 18,000 rpm when running on 15 percent nitromethane fuel and with the silencer removed. This is outstandingly good.

Rest of engine test articles can be found at http://sceptreflight.com/Model%20Engine%20Tests/Index.html

in 1974, Peter tested the Cox .049 Black Widow, it achieved .78 bhp at 15,500 rpm on 15 percent nitro (sub-port inducted (SPI) version.)

http://sceptreflight.com/Model%20Engine%20Tests/Cox%20Black%20Widow.html

So, in spite of its humble appearance, we have a reed valve engine that seems to approach performance levels IMO nearing the stock Cox .049 Killer Bee class. This is at least with the separately marketed complete engine. I don't know, perhaps Testors streamlined costs in production RTF's that resulted in detuning some of the "pipe bomb" engines. The only example I have is one 8000, rest the earlier front rotary valve engines.

In Cox Engine Forums https://www.coxengineforum.com/ there are threads where some have posted their various ways of implementing mounting the "pipe bomb" engine on an aircraft, videos and such that may be of interest.

Here is a photo of the engine I found...

Any idea what the model the engines were used on since I see no motor mount for screws. So i figure it was helt in place in the model it might have been made for.. ?