Fox Engine Identification - RC Groups
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Dec 14, 2006, 03:50 AM

Fox Engine Identification

Hi All
Please help me identify this engine. I know it must be from the Fox Factory, from the structure and carb design, but I cannot find any pictures on the Fox site that looks like this one.

- It has no markings on any of the casings or parts (none whatsoever)
- It must be around .36 to .50 in size
- The casings are factory polished
- It came with a copper fixed ventury carb (no butterfly) and a throttle
carb as fitted in the picture
- It has bronze bushings (no ball bearings)

- I would like confirmation that it is indeed a Fox
- Size and engine type
- Year/s of manufacture

Is the engine worth collecting or should I just use it somewhere?

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Dec 14, 2006, 08:30 AM
Don't cut the Yellow Wire
dr.E's Avatar
Is that the prop they sold it with......
Dec 14, 2006, 10:52 AM
Ascended Master
Sparky Paul's Avatar
It looks like a Fox 36X.. with an aftermarket venturi and exhaust.
How old, I dunno.
Dec 14, 2006, 11:11 AM
And You're Not
Fox made carbs like that, I think it's the right carb.
Latest blog entry: My Quad
Dec 14, 2006, 03:04 PM
Thanks for the response everyone......... Dr.E, the prop was fitted to hold the enjine upright for the pictures, and does not belong with it.

I cannot understand why someone would go to all the trouble to make moulds for such a beautifull engine and not put a name or brand or even the size nor serial markings on it. Was this common for Fox engines or perhaps a serious oversight?

Maybe I should remove the head again to measure the bore and stroke to establish the correct displacement first, or even mail Fox Manufacturing. Wonder if they'd bother to answer. Could be worth a try.
Dec 14, 2006, 03:19 PM
And You're Not
Here you go:

Looks like a 40 or 45 from between '75 and '77. The carb and exhaust stack are correct.

The carb is the 2-Jet
Latest blog entry: My Quad
Dec 14, 2006, 09:21 PM
Suspended Account
It is a 0.40 cid (6.5cc). The 0.45 (7.5cc) was stamped as such on one of the mounting lugs. Too bad it doesn't have the 3-needle card. Fox has a very good customer service policy.

P.S. This engine runs best on mild nitro 25% (Missile Mist) up to 40% nitro. The head has no squish band which result in poor low nitro performance. Also use only caster oil in 40% or lower nitro fuels.

The back door cover screams FOX. No need to say anything else.
Last edited by Konrad; Dec 14, 2006 at 09:28 PM.
Dec 15, 2006, 01:31 AM
I also found a 1977 brittish RC magazine last night with a sales add stating that it is a Fox .40 RC selling for 28 Pounds, so you both nailed it. Thanks for the interest.

I've been flying for two years and have only seen/used the following brands: OS, Enya, Webra, ASP, GMS, Saito, Magnum, Fugi, Thunder Tigre, Cox, Super Tigre and YS. Looks like Fox was never marketed in South Africa. Now the big question.........Is it worth collecting?

Dec 15, 2006, 09:39 AM
And You're Not
Over here, Fox engines were ubiquitous fixtures in any hobby shop of that era. I'd be surprised if that one would bring $50 on Ebay with box and papers. But it's a nice example of the model, and it's complete with correct carb and exhaust. Being the bushing version rather than BB hurts its value IMHO, but it's still a good clean engine that was only produced for a couple of years.

I'd say hang on to it, it's bound to be somewhat of a novelty in SA, and selling it isn't going to make you wealthy
Latest blog entry: My Quad
Dec 16, 2006, 12:14 AM
Registered User
on pipe's Avatar
The .40's are old workhorses. Feed it a good dose of castor and it will last forever.

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