martenson

More picture of the crankcase.

jeffie8696

If you have seen enough cast parts you will eventually see a casting flaw like the one you have. Inclusions are not that unusual.[8D]
My friend has a Nostalga Top Fueler running about 95% nitro. He is still learning the car and has not done too well but he gets better all the time. Here is a photo from Indy last year. Nice track. Love the 70 Challenger and the 440 is one of my favorite engines to work on. I don't know why but I can't get a Chevy to run the way I think it should to save my life.

martenson

Jeffie I know what you mean, I have never owned a Chevy only a Ford Fairline 500 XL 1966, I'm a MoPar guy.
Now I have a 66 Dart, restoring a 68 Charger, my Chally and my wife's 72 Charger 440 4 speed.
I have been a pilot in 2 different FED ond straight six ford rail and one 392 hemi rail.
And my daily driver is a Dodge Nitro, (what I do to help the US economics, just kidding)

I have not seen this type of casting flaws for a long time, but this engine is real old, even though it was NIB.

Take care.

Check this out http://www.moparperformance.se

MatheusC20XE

nice thread!

o love high performance engines too.. but, my culture are smaller and more efficient engines (double overhead camshafts and quad valve per cyl), but i like the old V8 OHV engines too..

very nice Mopar there...

Kimhoff

My Feedback: (22)

Anyone have a head for a Fox 60 they are willing to part with? Looking for one without any broken fins.


Thanks

Sport_Pilot

Which 60? There was a bunch of them.

Hobbsy

My Feedback: (102)

I'll check, the .60 head and .74 head clamp are the same, do you have the button already. The little pointy ends of the fins near the bolt holes are vulnerable and get broken off quite often. My big Fox' are all wearing Davis Diesel heads.

Kimhoff

My Feedback: (22)

Sorry guys, the head I need is for the original Eagle 60.


Thanks

Hobbsy

My Feedback: (102)

Like this one on the engine, the other is a much newer one.

Kimhoff

My Feedback: (22)

No, It is a one piece head. Has the grove for the baffel on the piston.

Hobbsy

My Feedback: (102)

Sorry, I guess that one is no that old.

dammitman

My Feedback: (15)

i might have a origional head for the eagle one. they will run fine with out a fin though. do you need it for restoration or what?

dammitman

My Feedback: (15)

burnt up another one.[] yep, this time i couldnt figure it out for sure. this was a fox 60 ABC tuned pipe special.[8D] it is on my old pattern plane with the exhaust turned to the rear. i am running an 11X8 prop and using wildcat promix 25% fuel an enya #5 glow plug and have tuned it on an egine stand getting the header lenght just right for maximum RPM . the combination worked very well on the first engine but it failed with a snap ring breaking on the piston rod retainer[], that scored the h&(( out of the cylinder wall. i put a second brand new motor on the plane and flew it a few times with no problems unless i tried to use a lesser nitro fuel, then it would dead stick but with the 25% fuel it worked great. i let it sit for about 2 months and got it out today and after the first run, something has happened and it is fried. i am not sure if it got hot, or has broken something. i am thinking about trying a 74 on it this next time. anyone ever use a fox 74 either ABC or ringed type with a tuned pipe? comments and suggestions are welcome and appreciated!

dammitman

My Feedback: (15)

is it one of these?

rcdude7

My Feedback: (264)

Was the air temp warmer two months ago when you last flew this engine? If so, did you richen the mixture to compensate? I can only imagine that a "fried engine, must have got that way from lean running maybe?

dammitman

My Feedback: (15)

i know what you mean and it was way hotter outside when i last ran it. today was nice and cool. i richened it up right away but maybe not quick enough. i did the hold up the nose to be sure it held the riched mixture as well i kinda think that something is broke, i wont know till i get it off and dissamble it. i started it slow and slowly ran it up in speed. something wasnt right from the get go. very dissapointing for sure but being a fox man i wont let it get me down for long. i even reajusted the carb some to make sure it was rich for sure. i really think that what broke broke on this run, not the last one before putting it up. i am wondering if i have it propped right. i cannot remember what the tach readings were when i set this whole thing up. but i think it maxed out best with the 11X8 prop. dammit, i am gonna be thinking about this now till i get it figured out,,,,,,[>:]

dammitman

My Feedback: (15)

well, i removed the motor and it did just what the first one did, broke the rear snap ring holding the piston pin in and that ruined the piston and sleeve. this seems as if it is not going to be durable enough for the engine. there must be a snap ring somewhere that would not do this. what happened is that one of the tiny holes for removing and installing the snap ring broke off. what i would like to find is a snap ring that wouldnt have those holes for removal and once it is installed it wouldnt be removable. i just looked at the fisrt one that did this and it too only broke the rear snap ring, the front one must be kept cool enough not to distort and break as it is in line with the intake port. this rear one is inline with the exhaust as i have turned the cylinder back for rear exhaust. i wonder if i can modify a snap ring and install it without any holes for the tweezersto squeeze it for removal? any suggestions?

Kimhoff

My Feedback: (22)

Make a new retainer out of mucie wire that is the same size as the snap ring. I have done this many times and it worls well.

proptop

My Feedback: (8)

I'd say to have a look around at other manuf. engines and get a different style pin retainer. Webras use the wire "e" clip for example.

dammitman

My Feedback: (15)

time for a new fox engine experiment. i am going to change motors on my pattern plane to a fox 74. i will have to turn the cylinder to rear exhaust and use a tuned pipe on it as that is the way the plane is set up. i am trying to deciede what engine to use, the ABC or the ringed version. also, i am decieding what prop to tune it for. i am thinking to go with a 12X10 . any suggestions? this outta be interesting.

NM2K

My Feedback: (14)

I have no experience with the ABC/tuned pipe version of the .74. But, when I talked to someone at Fox in the 90's about running a 12x8 on the ringed .74 version IV, he said that a 12x7 was the absolute most that they would recommend/warranty on that engine. He wouldn't say specifically why, or I didn't ask the question properly.

My ringed .74 was an absolute brute and would pull my Hobbistar 60 vertical immediately after a 30 foot takeoff run. All would be well until about the 5 minute mark when the engine would just quit for no apparent reason (yes, I checked for switched fuel/vent lines and a clunk stuck in the front of the fuel tank). I messed around with this engine for a month or two and was about to send it back for a once over by the Fox folks when a friend told me he would trade me the Phoenix 8 (partically built) and Webra Speed .61. plus my old, never used, Rhom retracts for my Fox .74 ringed, assembled Hobbistar 60 ARF and cheap Futaba radio. I jumped on the deal and that was the end of my Fox .74 problems. I don't think he ever tried to fly it.

So, after all of that, the point is that the engine was not designed to be a torquer type of engine and was meant to rev up a bit. Personally, just a WAG, I think I would drop the fuel down to something in the 5% to 10% range. I know that the original Fox baffled piston engines were meant to run Fox Missile Mist (25% nitromethane and nitroethane), but I don't recall any of the .74 and .60 Eagle IV's being set up that way. Then again, I've never owned the ABC piped version, so I could be wrong. Good luck getting them restored and running well again.


Ed Cregger

landeck

My Feedback: (1)

Ed Cregger's comment on using 5 to 10% nitro with a Fox Eagle IV instead of the recommended 25% Missile Mist made me think of my Fox Eagle I 60 that I purchased in 1973 and am still flying today. For 35 years I have been running it with 10% nitro using a mixture of the castor oil and synthetic lubricant even though Fox recommends 25% Missile Mist. I have used mainly Omega 10% for the last 25 years. It runs great.

The Fox Eagle I was my first RC engine. I bought it because I had been flying with Fox CL engines since the early/mid 50's and was comfortable with them. Over time I replaced the original carb with a MK series carb and a new style Fox muffler which attaches using the outer bolt holes rather than the centered bolt holes of the original muffler. The power is still better than a modern 46 but less than a modern 61. The next plane I am thinking of putting it in is the ARF RCM Trainer 40. It was a RCM Trainer 60 that I originally put the engine in to learn to fly RC.

If you have any stories on the longevity of your Fox engines, I and I am sure others would like to hear them.

Bruce

Hobbsy

My Feedback: (102)

Wow Bruce, I flew my RCM 40 mostly with an ancient Saito 40 and a few times with a Fox .50 Diesel. I learned to fly with a Tower Trainer 60 ARC covered with 21st Century Fabric and wearing a Fox .74 ABC. This in 1991, I was CL guy and Moto Xer before that. I converted the .74 to Diesel I think in 1994.

dammitman

My Feedback: (15)

well, i have two motors ready to test run now both ABC types. both are the earlier versions and that may be a problem as they tended to run hot right out of the box but, i am gonna give them a try. i am thinking that 12x10 is abit steep and gonna start out with a 12x8. i know for sure that they will spin a 14x6 as i have done that with a 74 with no problem at all. also, i have installed a perry carb because i know for sure it will work well. gotta get my engine test stand fixed up as it is in pretty sad shape right now. i hope to get this all going early this week. my plan is maximum torque at relativly low RPM thus the high pitch propeller.

Hobbsy

My Feedback: (102)

DM, the .74 should turn the 12x8 at 11,200 rpm on 5% nitro.