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Author Topic: Fox 40 Mark VI RC engine  (Read 3162 times)

Offline Paul Smith

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Fox 40 Mark VI RC engine
« on: March 02, 2025, 01:53:31 PM »
This is a rare and very complete display set of a Fox Mark VI 40 RC engine.  As you are well aware, the Fox Mark VI 36 was a stump-pulling powerhouse of a combat engine.  Mr. Fox bore n stroked it up to FORTY cubic inches and made into a powerful Class I Carrier and Scale engine, as well as a powerplant for 60-size RC models.

This rare engine feels like it WANTS to run and run fast.

It includes the engine, throttle, muffler, spinner, propeller, fuel tank, hoses, display stand, and US shipping. 

I bought this with the intent of flying, but have acquired a lifetime supply of OS & K&B 40's, so I offer thus fine power system to a collector or user of Fox products for only $150.

I require payment in US cash, checks, gold, or other hard currency.
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Paul Smith

Offline Dan McEntee

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Re: Fox 40 Mark VI RC engine
« Reply #1 on: March 02, 2025, 06:26:56 PM »
  If I remember correctly, that is an ABC also, the Deluxe version. There were three Fox .40s available then I think. One was an steel liner and iron lapped piston, The next notch up was a steel liner and a ringed iron piston. And the third was the ABC Deluxe version that came with the aluminum spinner and the other goodies. They were considered the most powerful .40 on the market at that time, all three were!! But were not a favorite of people that did not understand how to adjust the carburetor, which had a high and a low speed needle and worked very well but was cantankerous!! It needed to be adjust each time out and through big temperature swings in a single day. I think Lew Woolard sold quite a few that were retimed for stunt by basically lowering the cylinder liner a bit to a certain spec. I saw one of his Fox.40's hauling Stan Hogarth's Jecto Shark .45 around the sky at Tucson on one of my early trips there and decided that I had to have a couple of those!! It wasn't long after that Fox began working on a new carb to compete with OS and such that just had a single needle and bleeder carbs.
   Type at you later,
  Dan McEntee
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Offline Paul Smith

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Re: Fox 40 Mark VI RC engine
« Reply #2 on: March 03, 2025, 07:58:31 AM »
I have never removed the muffler to look at the typo of the cylindre' y pistone'.

But it sure is a Combat Mark VI case, which would make it the newest and most powerful of the Fox 40 series. 
Getting a good low idle on a high-powered engine is always something of a challenge.  That's why everybody doesn't win Carrier.

If this doesn't sell, you've temped me to put it in a plane.
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Paul Smith

Offline Paul Smith

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Re: Fox 40 Mark VI RC engine
« Reply #3 on: March 03, 2025, 09:41:27 AM »
Based on a comment, I removed the muffler and looked inside.  I don't know what it is, but it's not ringed.  I couldn't see any brass color.  The exhaust opening looks rather high, which indicates muffler timing. And it looks like it has been run.
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Paul Smith

Offline Dan McEntee

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Re: Fox 40 Mark VI RC engine
« Reply #4 on: March 03, 2025, 02:00:24 PM »
   Yes, if I remember correctly, the brass liner is pretty easy to see. Lou Woolard worked with another guy todo a write up in his rework specs and it was in a Stunt News many years ago. It centered on dropping the liner, and that was done if the timing numbers were not what he wanted them to be. If too high, he had a mandrel to put the liner on and took an appropriate cut off the bottom of the lip. There was a few other items I can't remember. You might be able to dig that out of the forums here because I think it's been discussed a couple of times before. The article in Stunt News gives a pretty detailed description of what the number should be for timing. I remember other here having mixed results using them stock out of the box, and sounded like it depended on model size, weight and props used. If yours is an iron lapped version, then oil content and types will make a difference.
  Type at you later,
   Dan McEntee
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Offline bill bischoff

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Re: Fox 40 Mark VI RC engine
« Reply #5 on: March 04, 2025, 11:47:03 AM »
Try a magnet. If it sticks to the piston or liner, it's iron/steel.
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Offline wwwarbird

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Re: Fox 40 Mark VI RC engine
« Reply #6 on: March 04, 2025, 07:53:35 PM »
Quote from: bill bischoff on March 04, 2025, 11:47:03 AM
Try a magnet. If it sticks to the piston or liner, it's iron/steel.

 WHAT? NO WAY!  :##
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Offline bill bischoff

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Re: Fox 40 Mark VI RC engine
« Reply #7 on: March 05, 2025, 08:19:45 PM »
WAY! %^@
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