Author Topic: Fox 29X Combat Special Wristpin Circlips (Read 3988 times)

badbill · « **on:** August 12, 2015, 04:10:49 PM »

I just tore down my Fox 29X Combat Special. Is it supposed to have circlips on both sides of the wrist pin? Mine only has one on one side. Is it captive by the sleeve on the other, or am I missing one? Doesn't look like enough room for one on the side it is missing?? If it is gone, where could I get another? Thanks in advance....

Steve Helmick · « **Reply #1 on:** August 13, 2015, 04:22:52 PM »

I can't answer the question about needing another circlip, not really a Fox devotee. But I made circlips out of old monoline wire that was the right size for Super Tigres, and they worked just dandy. I used a small hemostat and started at the straight leg and finished with the round part. Be sure the groove(s) are clean of carbon and castor muck before you install the clips. Easier than you'd expect!

I would expect Fox will be selling NOS parts for the next 20 years or more, so it's worth calling them and asking if they have what you need.
However...the .29X was a speed, B teamrace and/or B Free Flight engine, so don't be referring to it as a "Combat Special". Those were either .35's or .36's. They may well have some parts in common, of course, such as the circlips. If you have or can obtain the correct parts list for your engine, that should tell you how many clips you need and maybe also if they are same as the .35/.36.

Steve

badbill · « **Reply #2 on:** August 13, 2015, 04:32:03 PM »

Quote from: Steve Helmick on August 13, 2015, 04:22:52 PM

I can't answer the question about needing another circlip, not really a Fox devotee. But I made circlips out of old monoline wire that was the right size for Super Tigres, and they worked just dandy. I used a small hemostat and started at the straight leg and finished with the round part. Be sure the groove(s) are clean of carbon and castor muck before you install the clips. Easier than you'd expect!

I would expect Fox will be selling NOS parts for the next 20 years or more, so it's worth calling them and asking if they have what you need.
However...the .29X was a speed, B teamrace and/or B Free Flight engine, so don't be referring to it as a "Combat Special". Those were either .35's or .36's. They may well have some parts in common, of course, such as the circlips. If you have or can obtain the correct parts list for your engine, that should tell you how many clips you need and maybe also if they are same as the .35/.36. Steve

Thanks. I wouldn't refer to it as that but... uh... it said combat special on the box

And the motor. Duuurrrr... Simply downsized to make it legal for B events.
As my dear ol' Mom used to say... ah, never mind

Steve Helmick · « **Reply #3 on:** August 13, 2015, 05:19:06 PM »

How about that? I am wondering what makes you say it's a .29? Doesn't appear to say so anywhere on the engine or box. A quick check of the cylinder bore will tell the truth, if there's any doubt. Good that you have the PL. It should tell you how many clips you need and the PN.

I'm really shocked to find that Fox made a .29 version of the 6 bolt backplate engines, since the .29/5cc engine size was pretty thoroughly killed by the R/C industry making all the crazy sizes that make no sense at all to any system of established rules. Assuming they felt a need to make a .29 version, I could understand they might use the same box, because it fit, but should put a sticker on it, somewhere, and engrave or stamp the displacement on the engine.

OTOH, I have bought engines from estate sales that were "NIB"...but the box wasn't quite the right box for the engine. Maybe that's what happened with this one? I envisioned the earlier 4 bolt backplate Fox .29X, either the one based on the early plain bearing .35 Black Head Combat Special, or the .35X/.36BB case. Duke Fox did make some strange engines...some for events that never came to be, or no longer had a market.

Steve

badbill · « **Reply #4 on:** August 13, 2015, 06:29:44 PM »

You did look at the pic and see the model number on the box, right... geez, this is getting silly.

jim welch · « **Reply #5 on:** August 13, 2015, 07:16:51 PM »

Bill...that motor uses one clip to retain the pin..is definatly a mk4 29 combat special..i got the nos clips if you need one pm your address and i'll send you one.I got the same motor and a friend in richmond has one also. It was a bad as...free flight motor and is strong as the 36 mk4 on a bladder.Some had the 29 stamped on the exhaust side mount and others like yours had the back plate 29 with the pressure fitting in the back plate right top.

jim........ps you going to the gscb?

badbill · « **Reply #6 on:** August 13, 2015, 07:31:48 PM »

Quote from: jim welch on August 13, 2015, 07:16:51 PM

Bill...that motor uses one clip to retain the pin..is definatly a mk4 29 combat special..i got the nos clips if you need one pm your address and i'll send you one.I got the same motor and a friend in richmond has one also. It was a bad as...free flight motor and is strong as the 36 mk4 on a bladder.Some had the 29 stamped on the exhaust side mount and others like yours had the back plate 29 with the pressure fitting in the back plate right top.

jim........ps you going to the gscb?

I have this particular one tore down for new bearings right now, but yes it is a HOSS. Got it on the Voodoo in the pic attached. Thanks so much for the definitive answer! Wish I could go but gotta work work work!

Steve Helmick · « **Reply #7 on:** August 13, 2015, 08:48:48 PM »

Quote from: badbill on August 13, 2015, 06:29:44 PM

You did look at the pic and see the model number on the box, right... geez, this is getting silly.

So we're supposed to interpret "12999999" as the engine displacement? Not very logical. You didn't show the stamped "29" on the backplate with the first two pictures. How come they didn't stamp it "1299999"?

Steve

badbill · « **Reply #8 on:** August 14, 2015, 06:31:36 AM »

Steve,
I am going ahead and reporting all your posts because at this point it is obvious that you are just a troll. Go back to the shuffle board court under the bridge.

Richard Entwhistle 823412 · « **Reply #9 on:** August 15, 2015, 03:04:09 PM »

Bill

That Fox is a very rare engine and it does have the correct box. If new I have seen that engine with box go for more than $350.00 on the Bay over ten years ago. The engine in the box has the pressure needle valve installed and won't run on suction. Combat guys would buy them new or used when they couldn't get the 36 and install the 36 piston and liner. I have several 36s with 29 stamped on the lug. It is a killer engine and may take the wings off a Voodoo in a tight turn if you can still stand up after ten or more two second laps. Don't ask me how I know that. And yes it does requires two "C" clips part number 13540 at $1.00 each. Fox called them "Snap Rings." I can send you a parts list if you need one. I also have some Rings bent by "Big Iron " or some stock ones made by Fox.

Later
Richard

frank mccune · « **Reply #10 on:** August 16, 2015, 11:41:31 AM »

Badbill:

I called Fox awhile ago and they said that they; had no more engine parts for sale. In the mean time, a friend of mine said that he would make Teflon buttons to replace the snap rings if I needed any. Perhaps some engine people here will produce some buttons to replace the snap rings.

Be well,

Frank McCune

RandySmith · « **Reply #11 on:** August 16, 2015, 12:00:08 PM »

Quote from: frank mccune on August 16, 2015, 11:41:31 AM

Badbill:

I called Fox awhile ago and they said that they; had no more engine parts for sale. In the mean time, a friend of mine said that he would make Teflon buttons to replace the snap rings if I needed any. Perhaps some engine people here will produce some buttons to replace the snap rings.

Be well,

Frank McCune

Buttons will not work too well for a loop charged engine, they will be eaten by the ports, so be careful what you put them in

Randy

bob whitney · « **Reply #12 on:** August 16, 2015, 01:33:35 PM »

the reason that the newer OS engimes and the cheaper engines have the cyl turned about 45 deg is so the wrist pin can ride on the sleeve,and they dont have to put wrist pin clip grooves in the pistons which is another step that cost extra

RandySmith · « **Reply #13 on:** August 16, 2015, 03:46:02 PM »

Quote from: bob whitney on August 16, 2015, 01:33:35 PM

the reason that the newer OS engimes and the cheaper engines have the cyl turned about 45 deg is so the wrist pin can ride on the sleeve,and they dont have to put wrist pin clip grooves in the pistons which is another step that cost extra

Yep , many engine mfgs do that, it is a good technique for loop charged engines, however I don't know about cheaper since they also have to make two teflon button inserts.. The pin cannot ride on the sleeve bare, it would score it badly

Randy

frank mccune · « **Reply #14 on:** August 16, 2015, 08:45:48 PM »

Hi Randy:

When I mentioned the Teflon buttons, I was thinking only of the older baffled piston engines. You are correct about the buttons snagging on the ports of loop charged engines.

Do you remember the older engines that had full floating wrist pins or had brass pads on the ends of the wrist pins to protect the cylinder from excessive wear? Some were even pressed in one direction only and removed by pressing the wrist pin out the opposite way. The good old days!

Be well my friend,

Frank

RandySmith · « **Reply #15 on:** August 16, 2015, 10:24:28 PM »

Quote from: frank mccune on August 16, 2015, 08:45:48 PM

Hi Randy:

When I mentioned the Teflon buttons, I was thinking only of the older baffled piston engines. You are correct about the buttons snagging on the ports of loop charged engines.

Do you remember the older engines that had full floating wrist pins or had brass pads on the ends of the wrist pins to protect the cylinder from excessive wear? Some were even pressed in one direction only and removed by pressing the wrist pin out the opposite way. The good old days!

Be well my friend,

Frank

Hi Frank yes many did that, even the OS 35 and 30 S had brass end pads, they also scored the sleeve, I have replaced maybe 300 of them and still have used sleeves here with score marks down each side

Randy

frank mccune · « **Reply #16 on:** August 17, 2015, 07:01:40 AM »

Hi Randy:

When you say that you replaced something in the OS .30 and .35 engines, what did you replace?

What do you think causes the brass pads to score the cylinders? I can only guess that it may be debris that collects in or on the area formed by the brass pad. Once a foreign particle would get into that area, I could see the brass pad acting as a lap to score the cylinder. Perhaps "carbon" is formed in that area.

Thanks for the replies,

Frank

Paul Smith · « **Reply #17 on:** August 17, 2015, 07:28:41 AM »

I think I have a couple 40's of that vintage that also say "Combat Special". Duke aimed to please.

RandySmith · « **Reply #18 on:** August 17, 2015, 11:46:09 AM »

Quote from: frank mccune on August 17, 2015, 07:01:40 AM

Hi Randy:

When you say that you replaced something in the OS .30 and .35 engines, what did you replace?

What do you think causes the brass pads to score the cylinders? I can only guess that it may be debris that collects in or on the area formed by the brass pad. Once a foreign particle would get into that area, I could see the brass pad acting as a lap to score the cylinder. Perhaps "carbon" is formed in that area.

Thanks for the replies,

Frank

Hi Frank

I replaced that many piston/sleeves in those motors, i also did more than 150 Special Smith OS 35s and a few 30s that had teflon pads in the end of the wrist pins instead of the metal pads, these special version also had bushed rods at both ends, were custom fitted, and had Smith hemi heads on them with all colored anodized RED , BLACK, BLUE, OR GOLD, as was the drive washer and many of the venturies all had matching colors, plus I drilled thru many of them so they would take a bolt on tube or tongue muffler. these pop up on sites ot Ebay from time to time.
There were also silver ones that had either bushed or hardened rods in them.

Randy

Author Topic: Fox 29X Combat Special Wristpin Circlips (Read 3988 times)

badbill

Fox 29X Combat Special Wristpin Circlips

Steve Helmick

Re: Fox 29X Combat Special Wristpin Circlips

badbill

Re: Fox 29X Combat Special Wristpin Circlips

Steve Helmick

Re: Fox 29X Combat Special Wristpin Circlips

badbill

Re: Fox 29X Combat Special Wristpin Circlips

jim welch

Re: Fox 29X Combat Special Wristpin Circlips

badbill

Re: Fox 29X Combat Special Wristpin Circlips

Steve Helmick

Re: Fox 29X Combat Special Wristpin Circlips

badbill

Re: Fox 29X Combat Special Wristpin Circlips

Richard Entwhistle 823412

Re: Fox 29X Combat Special Wristpin Circlips

frank mccune

Re: Fox 29X Combat Special Wristpin Circlips

RandySmith

Re: Fox 29X Combat Special Wristpin Circlips

bob whitney

Re: Fox 29X Combat Special Wristpin Circlips

RandySmith

Re: Fox 29X Combat Special Wristpin Circlips

frank mccune

Re: Fox 29X Combat Special Wristpin Circlips

RandySmith

Re: Fox 29X Combat Special Wristpin Circlips

frank mccune

Re: Fox 29X Combat Special Wristpin Circlips

Paul Smith

Re: Fox 29X Combat Special Wristpin Circlips

RandySmith

Re: Fox 29X Combat Special Wristpin Circlips