FrancisPerson

Tried the head shim from a soda can and it made no difference.

FRancis

badger5964

My Feedback: (6)

Here is my two cents worth of unvaluable advice.

If it slows down at full throttle when glow plug is removed you need:
a hotter plug (fox standard long is hottest fox), more compression (I do not run shims in mine with 0% nitro, the soda can shim likely lowered compression, try without any shims), more nitro (10% should plenty with a shim), too rich (lean until pinch test results in no increase then back off 1-3 clicks), poor compression. My 60s are eagle IV however.

Also that MAN article was for an Eagle IV, yours is an older version but it is still to far off.

50+AirYears

I'd go along with the idea of a lower nitro fuel. Sometime during the evolution of the Eagle series, there was another nitro shortage when one of two plants in this country that manufactured nitromethane was shut down for a while because of fire. Fox retimed and recompressed the .60 to develop more power from 0 to 5% nitro to reduce operating cost. It may have been the Eagle III.

The RC Rports reviewer showed one of the Fox Eagle series turning some of the smaller .60 sized props close too the RPM of expensive performance engines like Rossi and Webra and turning larger 13" and even 14" props faster than some 4S 120s. Only problem I've had with mine so far seems to be a sensitivity to tank height.

FrancisPerson

Yes I do need a hotter plug as it does slow down when the glow driver is removed. The low speed needle cannot be leaned any further as it won't transition (and fussy starting). I will have to order a low taper needle from FOX. Compression "feels" good and that is why the poor performance baffels me???

I measured the soda can head shim at .004" and the stock FOX head shim at .008"


FRancis

Sport_Pilot

The button is designed in such a way that a shim may not work. It may take re-working the button itself. Try 0% nitro not head shims.

FrancisPerson

0% nitro is not sold at any local LHS and I do not have a metal lathe.

Today I called FOX and ordered a "new" FOX HOT plug and a low taper low speed needle.

I would rather have dependable running and smooth transition ove max power.

Thanks
Francis

Sport_Pilot

Most will order you a case. But I would simply buy some oil and methanol which is not hard to get. In fact when I lived in Hagerstown Md. I bought some from a sprint car racer. There is someone who posts on this site who would be happy to turn your head button for you, ajcoholic I think.

fujiman

My Feedback: (133)

any of you fox gurus out there have a nib, or not so used .61 fox hawk. broke the case on mine. ran like scalded monkey. loved that eng. replaced fox carb. w/perry fantasic idle/mid./wot. help me would you?????

carddfann

I don't have any hawk cases, but you might want to check in model airplane magazines or check with your local club for any large trade show/swap meets coming up. I live near Toledo, Oh and went to the huge Toledo show last year and was blown away by all the stuff there. There were many, many people selling all kinds of spare parts and old motors. It was practically an engine scrap yard. I found some new, in-the-package gaskets for an old McCoy red head 35 I still like to run once in a while. I plan on going again next year (I think its in early March) if nothing happens. If you haven't found one by then, send me a PM and I'll keep an eye out for you....Gary

rcdude7

My Feedback: (264)

I bought a used Fox eagle 4 here on RCU from a seller who could not get it tuned properly, so he said. The head button installed was modified as per the "flightline solutions" blueprint and he had about 4 shims under it also. I'm guessing the compression ratio is too low this way and might be the cause of this tuning problem so I removed all the shims and am going to try and run it this way with 5% omega. The seller also included a stock unaltered button and from the looks of it, it is very hi-compression, has a very small bowl, probably designed for 0% fuel only.

I also bought a new late model eagle 4 and it has a stock head button that looks very much like, but not exactly like the one modified per flightline solutions.

One of these engines (late one) has the EZ carb and the other has a two needle.

Which of these carbs is better? Are there any tricks to tuning them?

Mike

Hobbsy

My Feedback: (102)

Mike, the EZJust is just that, set the airbleed about halfway across the inlet hole and you'll not have to move it very far if at all. The carb has metering slots so the airbleed is just a trim for different props, fuel etc.

fujiman

My Feedback: (133)

rcdude7, i have all the info on all the mods. on the .74 eag.2 from eng. sols. also, good info there. fox tryed several head buttons over the years. i bought 2 of the latest for my .74s, installed 2 head shims as/per eng. sols. haven't run them yet but i hope it tames the beast. i have one in a world mods. dago red .46 going to do some informal race with r/c budds. i have installed perry carbs and adapt. on both engs. have had great results with them don't reallt like air bleed carbs myself. just my old cranky self i guess. if any one comes by 1 or 2 nib .61 hawks my ph# is 971-237-4663 thanks and good flyn'

StingRayZ09

Hello Fox club.. I myself own two Fox engines One that was build in 1973 Fox .78 Ringed engine and a Fox Eagle .74 .78 Fox runs great and fast at 12,000 rpms with a 13,6 prop. the .74 not runing yet, due to muffler problem can't seem to fine the right muffler Can anyone out there help me fine a muffler. Motor is in a Waco biplane need one that goes stright down.

fujiman

My Feedback: (133)

stingrayz09, you've prob. already thot if this, have you tryed slimline, j-tec,bisson. maybe they could fab 1 up for you? in the past i've been forced to fab' one up for myself. maybe a r/c buddy who welds can help. even if it comes out a bit heavy, maybe your waco could use the nose weight. just a suggestion. regards, fujiman

carddfann

Have you tried Sheldon's Hobbies ebay store? http://stores.ebay.com/SheldonsHobbies
They have a lot of slimline mufflers for older engines like Fox and K&B. I would think a slimline sportscale muffler would work if it comes in your size and exhaust opening. Sheldon's has some older slimline mufflers that strap on so they're universal.

carddfann

You might also try mecoa.com. Last year they brought back the old line of Tatone cast universal mufflers.

carddfann

Sheldon's also carries a lot of Tatone mufflers.

jjscott

Well, I just picked up my first Fox engine from an ad here on RCU. Can someone tell me what it is, what type of carb it has, and the approximate vintage?

Thanks, Jim

fmichaelb

It's a .45 with the EZ carburetor. That model is still in production. That isn't a Fox muffler on it, but hey, if it works, use it.

moodier

My Feedback: (1)

Hi;I just added to an old post I had made few years ago!Maybe you fellows can help out with the info?DId get them running but would like to know if am tuning the correctly?Thanks!!

jjscott

fmichaelb; thanks.

I looked at that carb with the air bleed and thought it must be an older, not newer, model. Guess I was wrong. The muffler was one of the reasons I bought the engine. I thought it looked kinda cool with those ribs on it. Not Fox, wrong again! No regrets, though, it will be fun to clean up and get running.

Jim

kersplat

I believe the engine is a Fox .40. I can see it stamped on the left lug.

fujiman

My Feedback: (133)

hi guys, i need your HELP! i have 4 older fox hawk .60 r/c i need either new con rods or info on who could rebush these, i can get brgs at boca, rings from frank bowman, 4 gaskets, but no rods or rebuilding services for them. tryed fox but they said they could not rebuild them. they suggested i send rods to them for poss. match up withsome old rods left over from days gone by. i mite do this if all else fails.

50+AirYears

Fox had several different .40s, one Schnuerle with the small case, and a slightly heavier version based on the larger Schnuerle crankcase that was also used for the .45, .46. and the .50. The small crankcase version has the carb as an insert into an opening on the front end, and the larger one, as pictured above, uses a flange mount for the carb.
Fox even had a short run of large case .40s designed for quickie or sport .40 racing, with a semi-tuned muffler, that could turn a 9-6 prop in the 18-19000 rpm range. Heard a couple people complain that they couldn't get it to idle under 5000 rpm. But then, one of the same people complained about the same thing with a Jet .40 Quickie, as well as the fact the Jett wouldn't turn a 10-6 worth a hoot. he expected a race tuned engine to turn the 10-6 at 20000 and have a 2500 rpm idle. He called Jett, and was politely straightend out.

WhiteRook

My Feedback: (38)

i have a few 45's and a 46 , and the bearings dry up on them . the thing that puzzles me is that the 46 ABC has never been run and the bearings just tighten up and the carb barrel sticks shut also. ON the 74 Eagle i own , its fine ,the bearings are smooth and the carb doesnt lock up.

what to do?