Hawk21

My Feedback: (7)

Hello Guys
I`m rebuilding a Fox .36 X that I bought and need to know if anybody is making an after market connecting rod for this engine? I took the engine apart and seems like somebody decided to improve crank pin oiling by filing a big slot at the bottom of the con rod.the rod has a lot of play at the crank pin it looks like it streched a little it seems to be an aftermarket item. I have received an original con rod from fox and it doesn`t look as beefy as the one on the engine. I will be reworking it for more RPM and I`m afraid of blowing it up with the factory rod. I have no experience on fox engines. In the 70`s I flew a few Flite Streak and voodoo`s but used Supertigre G21/35c and OS 35c engines. I want to fly a combat type again with my son.thanks.
Yours
Tflame

Elwyn

Oops! Never mind. Didn't read your entire post and didn't realize you had already obtained a new stock rod.

tflame

My Feedback: (1)

Hello Elwyn
Thanks anyway. Does anybody knows if Richardson precision machining is still in buisness?I have their ad on a Flying Models mag of Aug 1989. They used to make High performance model engine connecting rods. If I can`t find an aftermarket rod, might end up making my own rod. I`ll just copy the one that is in now.
Yours
Tflame



Modeler since 1963

Old Sourdough

To the best of my knowledge, RPM is not in business any more, at least for the general modeling populace. I tried to contact them a few years ago to (hopefully) obtain an extra few rods for my OS Max-S .35's as spares, but never received any answer to my letters. It may be worth noting that I also never received my letters back as undeliverable, either.

ROGER RUSSELL

My Feedback: (12)

Can not answer your question but maybe you could answer mine.

Was wondering what a Fox 36X is worth.

I have one that I flew on a Ringmaster.

It sure did scream.

Thanks

RORO

Elwyn

I would think about $40 or so dollars for one in good condition since you can get a brand new asian rim engine with as much performance for around $65.

tflame

My Feedback: (1)

Hello RORO
I bought mine on ebay and paid $50.00 for it ,the guy claimed it was on excellent condition but after disassembly I noticed to much play on the rod big end and some enthusiastic reworking by way of a big groove in the big end for oiling.which could account for the weakening and strech of the hole on the rod. The rod is not a factory rod as I have a new rod from FOX and is not as beefy. I don`t have any experience with FOX engines. I have operated other makes of engines mostly the OS,ROSSI,MVVS,SUPERTIGRE and NELSON. I used K&B,COX and the old OS MAX engines in the past. I would like to thank everybody that have replied to my query.

Tflame

Modeler since 1963

zeke mccoy

If you keep the nitro down, and use good fuel with good oil, I would think the stock rod would be adequate. We used to run them on tornado 8/8 with missile mist.

tflame

My Feedback: (1)

Hello Guys
I ran the FOX .36 X combat Engine today. I used Powermaster GMA 5% fuel an APC 9x6 the temp was 89f and the engine turned 10,500 RPM as seen on my Royal Tach. Later on I tried Cool Power 15% with castor oil added and with the APC 9x6 I was able to see 12,000 RPM on the tach. I would like to know if these are good readings for this motor. I replaced the connecting rod with a factory item that I reworked for better lubrication on the big end. I also made a new venturi insert of .395 inch versus the one that was in of .370 inch. I received from FOX a brand new Cyl and Piston with Connecting rod which I`m planning to use on the engine to see if performance improves at a later date. I would like to thank ZEKE on his comments and if anybody has any more info on this engine that might want to share it would greatly appreciated.thanks all.
Yours
Tflame

Modeler since 1963

MrMotor

The 36X was designed to run on 25% nitro and at least 20% castor oil fuel. Unless you have a BB version the engine has a needle bearing in the rear and only the aluminum case up front for support of the shaft. Most people removed the restrictor and ran either a bladder tank or drilled and tapped the backplate center for a 4-40 case pressure fitting to run tank pressure. You noticed a performance gain from the increased nitro. Going to the recommended 25% will give you even more power especially with the larger intake.

zeke mccoy

My first engine was a 36x, Christmas 1969...I opened the box.. within ten minutes I was in my uncles' basement and had it apart. Flew it on Voodoo's, Sneakers, and most famous of all 'Fox Feathers'
I remember the 36x as a cranky hard to start pig. First minute of the match spent flipping. Fond memories.

Elwyn

Does anyone know the venturi size on a 36X with the venturi insert installed?

tflame

My Feedback: (1)

Hello Elwyn
I recived today another FOX .36 X combat 1964 vintage and I measured the insert and the insert on my 1968 .36 X and it is .270 Thousand of an inch. I sated on a previous post that it was .370 my mistake,sorry. I increased the size to .295 on the one that I made for my engine and didn`t have any suction problems. I will try no insert and pressure later on.Hope this helps.
Yours
Tflame


Modeler since 1963

Elwyn

Thanks. I got a couple of R/C 36X's a couple of years back and hope to turn them into sport engines for C/L.

tperry2054

My Feedback: (15)

Elwyn,

I've got a method to make inserts for the 36X engines that is almost foolproof. I extend the intake higher, use the old spray-bar holes to hold the new piece in place and put the new spraybar up higher for better performance. As soon as I round up the materials I will take pictures and show all how to do it.

Tom

Elwyn

The R/C version of the 36X just had the carb attached with some sort of high strength adhesive. Certainly not the best method for putting an engine together. The amount of metal left sticking up doesn't leave much room for putting in a hole for a needle valve. It could probably be done but as ham handed as I am with tools I'd just as soon not try it. I'm thinking of JB welding on a short piece of brass tubing that will have plenty of height to allow for a needle valve hole and you would be able to have a removable venturi. I made a .270 venturi out of a nylon spacer I'm going to try.