I was recently given 2 Moloney 125. Does anyone have experience with this motor? I was told they are not very powerful but can not find any hp ratings in the box. I imagine it may be a good motor for about a quarterscale cub. Any suggestions on what type of plane it would be good for?

Thanks for information
Doug

I don't anyone wants to admit to having any experience with a Maloney. All kidding aside, they were low on power and hard to start without an electric starter and they generally ran poorly.
A few people ran them, but for the most part the modelling public took a look, kept their money and the Maloneys went away. The 100 was the worst-terrible was a good description. The 125 was a little better, but still could not measure up to any other small gas engine conversion that I know of.

If you like playing around with engines, love to tinker and have a high tolerance for frustation, play around with them. I would not recommend you put them on a plane you want to fly regularly.

Sorry I'm so negative, but the reason you don't see them today is they didn't measure up.

HP numbers are worthless for comparing model plane engines ..I have converted a few 125s and one 100.Best rpm from a 125 was 8000 with a 16-8..Don't remember what the 100 did..
the bores are cast iron, and were not perfectly round and straight..I had the bores honed to just clean up and make them round and straight..the piston rings were a little weak, but when broken in seemed to work OK..The plastic block under the carb is easy to strip and probably not flat, causing loss of crankcase pulse, so take the carb off and lap the plastic on both sides..Take care not to tighten the screws too tight..Easy does it..
Be sure the carb diaphragms are not stiff, use an electric start, and they will run pretty good after some break in time...
John Maloney had a good idea there..With a little more attention to detail they would have been fine..The converted 100 was a good little engine..The ignition circuit fits inside the mount, with the heavy mag rotor and crank cut off..A G62 coil fits behind the cylinder where the source coil was, and makes a nice small package...Ball bearings on the crank and rollers on both ends of the rod...There is a small weed eater , John Deere brand, that had the same size bore and had a better piston ring..I used fixed timing, set at 28 BTDC..No syncro spark needed on such a small engine. Hand starts are easy with CD ignition...

I've got to go along with Ed. I have a friend that used emery paper on a flat surface and ground down (slightly) the cylinder top.This raised the compression slightly and the engine ran significantly stronger. My opinion is use it on something like a Curtis Robin type model. Too bad, they were kind of a cute little engine, but they would make a better anchor for a row-boat as their power to weight ratio was really awful. Ok, next time I won't hold back.
Best of luck, Mike

Don't get any crazy ideas about using those Maloneys in a twin. You'll have a disaster. I could never get mine to run and I ended up giving it away. I don't think He ever got it running either.

Antbody wants to give any more away, I'll pay the postage..RC IGNITION
PO Box 636
Williams, AZ 86046

I have a Maloney 125 I bought for an ACE Big Bingo, so when I build the Big Bingo I'm going to use the Maloney, I put CH electronics Ignition with SynchroSpark on it and a J-Tec snuffler. It turns a 15x8 at slightly over 8,000. John Maloney did all the R&D on the 125 with 15x8s. I love to run engines other people can't.

A fellow at my clubs field had a giant ugly stick with a maloney on it. He flew it regularly, didn't seem to have any problems with it. The stick wasn't exactly going high speed, but could do loops, rolls, etc... But boy was it ever loud.

I GOT ONE OF THE FIRST MALONEY 125/DRAGONLADY COMBO'S BACK IN LATE 1985. ANY OF THE OLD HAMTON VA. CLUB MEMBERS SHOULD REMEMBER IT. THE ENGINE WAS HARD TO START WITHOUT AN ELECTRIC STARTER.ONCE IT WAS STARTED THOUGH, IT RAN WELL. IT WAS VERY DEPENDABLE. THE DRAGONLADY BY MODELTECH, WAS HEAVY, BUT IT FLEW WELL. IT LOOPED ROLLED AND YES IT KNIFE-EDGED THE LENGTH OF THE FIELD. I DONT KNOW IF THE ENGINE WENT THRU CHANGES THRU THE YEARS, BUT I CAN TELL YOU THAT THE ONE I HAD WAS FINE. I HAD A 15X10 ZINGER ON THE NOSE, AND IT PULLED OK. IT WAS'NT BALLISTIC BY ANY MEANS AD THE PLANE WOULD HAVE FLOWN MUCH BETTER WITH A G-23, BUT I COULD'NT PASS UP THE COMBO PRICE. NOBODY EVER HEARD OF A MALONEY OR DRAGON LADY FOR THAT MATTER, SO I WAS PRETTY MUCH ON MY OWN. IT WAS MY SECOND GASSER SO I KNEW A LITTLE ABOUT GAS ENGINES. I PROBABLY WOULD'NT BUY ANOTHER ONE WITH TODAYS ENGINES, BUT LIKE I SAID THE ONE I HAD REALLY RAN DEPENDABLE AND FUEL ECONOMY WAS PRETTY GOOD FROM WHAT I REMEMBER. I DONT KNOW WHERE THE ENGINE IS NOW, BUT I STILL HAVE THE DRAGONLADY. A WONDERUL AIRPLANE.

Dugman, if you don't want to wast time tinkering with the (2) maloneys. And if you want to sell them I will offer you a fair price. E-mail me at [email protected] if you decide to sell.

I have a brand new Maloney 125 with muffler for sale take any resonable offers. over 125.00

Ray in Las Vegas 702 232 0904

I had a Maloney 125 way back when. I bought it new.

The engine was heavy and underpowered, but it ran "OK".
If John would have lived longer, maybe he would have improved the engine over time.

Give it back.
BCCHI

Take it to a precision hone shop, get the cylinder honed round and straight..Then get a Frank Bowman ring...Take the useless stock mag off and convert to EI..Get some G10 epoxy board and make a new carb insulator block...It should run OK then, it's still a little heavy for its size, but not bad...The same company made the Horner Twin..It was better..
These are Taiwan engines, made a long time ago before the China engines came about..

didn't the Maloney have a stamped steel con rod?