Posts: 3964
Joined: 6/10/2003 From: winter park, FL, USA Status: offline
OK Guys NEVER owned a fox till several months ago. After talking with Hobbsy and his fox 50 good experiences with it, and talking with Bob Davis I decided to get one, the 50 is "out of production" but Mr Davis called fox and they "made one up" took about a month Then the box came from Davis Diesel , One engine and one diesel head, After a run in on 5% nitro with an other 3% castor on went the diesel head. IT HUMS, Most of my 50 class engines are Irviine 53s with davis heads, The fox runs just as well and with the air bleed carb it adjusted so well I was shocked good idle , good throttle response. I wonder how many other engine manufacturers would take the shop time to do this MADE here in USA and they were proud to do it Thanks Charlie Thacker -- martin By they way MVVS and Irvine run on low nitro 5% also (I have them) and FAI with a warmer plug I have been doing this for a while my first engine was a drone 29 diesel for C/L which as a kid went to the factory on the bus as a kid and picked it up from Leon Shulman
K if you go to the Diesel site you will see some pretty positive stuff on the Fox 50
< Message edited by dieseldan -- 11/13/2005 3:20:14 PM >
Posts: 389
Joined: 5/5/2004 From: Palm Bay,
FL, USA Status: offline
Well bravo, a one made engine I suppose they looked it over better than in the 70s and 80s when they were lemons. The only reason to buy a Fox in those days was because that was the cheapest engine money could buy and you would throw away the carb and put on a Perry. Combat flyers liked them because of the disposability of the engine. They took a lot of punishment, but the carbs were and are trash.
Posts: 3964
Joined: 6/10/2003 From: winter park, FL, USA Status: offline
Combat flyers liked them because of the disposability of the engine. They took a lot of punishment, but the carbs were and are trash.
They took a lot of punishment?????? sounds like a terrible engine. By the way I do have and did mount the Perry carb on my fox right after I got it and the "trash" carb seems to run just as well. martin
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Joined: 12/2/2001 From: Colonial Beach,
VA, USA Status: offline
I'm unlocking this Thread with the stipulation that any further posts be constructive, useful advice to help CRAZY4FLIGHT with his overheating problem. Whether we love Fox engines or hate them is not the issue here.
Craze, if you run 5% or less nitro with 20% lube which is at least 50% castor, a 10x6 or 11x5 prop and a relatively cool glowplug the Fox .50 should turn the 10x6 at mid to high 13s. Put a good hour on it at lower rpm if you're not sure its broken in. This is mostly a re-cap of what others with experience have stated above. If you happen to have the big long Quiet Muffler you'll lose about 200 rpm but the prop will make more noise than the exhaust.
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"I have gone faster backwards, upside down and on fire than most people have gone at all" Don Garlits
Posts: 1062
Joined: 12/31/2001 From: Jordan,
NY, USA Status: offline
Back to the origonal question, the Hot Fox 50.
I have two of them, both with the two needle MKX carb. Yes, they do run hotter than most two strokes in that size range, but that is the nature of the Fox engine. Heat makes power and duke understood that. There are a couple different head buttons available for ther 50, some are very high compression and 5% nitro is about max, some have a deeper bowl and a narrower squish band and can easily handle all the 10% sport fuels with ease. If you absoutly must run 10% in yours, give Fox a call and ask Charles Thacker about a head button for lower nitro, you may need to take the head off yours and describe it while on the phone. Sometimes the glow plug has a lot to do with it, the hotter the fuel (more nitro content) the cooler the plug is especially true in most Fox engines.
Do'nt let the bickering in this thread throw you off. Once you get to know your Fox, it will be the lightest engine in its class and be probably one of the most powerful. I have two Fox 50's that have countless gallons through them and a pair of 74's that I stopped counting at the 1000 tank mark over 4 years ago and they are still going strong.
I have a couple fox 50s now but i bought both them used and dont know what the previous owners ran them like. it has been real interesting reading all of this topic. i am the only one here who runs fox engines. i run them almost exclusivly and they are the only 2 strokes i run. i do alot of experimenting with them on the running. i love a good engine challenge and i like to be different at the field,,,so thats why the fox engines. i have also run into several of mine that seem to run too hot. i have others that run cool and never get hot. i like to put my engines to the test of extremes with tuned pipes. i have found that its very important to have plenty of fuel for the engine. make sure the tank is mounted so the engine will get all the fuel it can use. i can tell you it dont take long (seconds) at wide open throttle running full out and to go lean to fry one of my engines. as far as the carb settings go, it just takes a bit of time and knowledge. if you dont have a idea about fuel/air mixture and have a reasonably good ear or poor eyesight for exhaust smoke and RPM's,,,,,you might have some trouble. but then again, that would go for any engine now wouldnt it!!!!! fox engines are for more modelers, builders and engine tuners and the OS LA engines are for arf's and folks who dont have the patience or desire to tune an engine or build up a model. see, its a great hobby we have,,,something for everybody!!!! pic below of my OS engine eater,,,,,,,,,thats ugly?
They very recently had the .25, 40, and .46 models in stock.
I suspect that the fact that Fox is now selling them direct at 40% off has more to do with Tower dropping them than the quality. After all you get a lifetime warranty with them, no need to bother Tower with them.
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Joined: 1/21/2002 From: Acworth,
GA, USA Status: offline
<i>Now that's a nice substitute. I have a OS .15 FP and OS .15 LA, want to trade? You can have both! I don't have a plane for it either, but I'd get one. </i>
The Fox .15 turns a 8-4 prop at least 1000 Revs more than those. No high nitro, head button, or carb issues. Though it is a lapped engine and vibrates a bit more than other engines, it is a very good and user friendly engine.
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RE: FOX 50 runs HOT - 
