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What engine is this Please
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What engine is this Please
getback Sun Aug 16, 2015 12:10 pm
I found this with some of my stuff I am going through , it has no ID on it but the glow works And is it rare 
Thanks In Advance , Eric 
Thanks In Advance , Eric 
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Re: What engine is this Please
Ken Cook Sun Aug 16, 2015 1:00 pm
looks like a Fox .049. Not extremely rare. They work well until the crank breaks or the rod launches through the piston. They needle like a big engine which is actually surprising. I never used the tank you show as all of mine were tankless. The plugs are hard to find and typical Fox quality. Very hit or miss with them and they go out like someone turned off the switch. We had great success drilling out the post and tapping for a standard long plug. They do like the nitro and a good one can hang with a TD. The question is for how long. Some of these can turn out some impressive numbers. The .07 shares most of the same parts and looks similar.
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Re: What engine is this Please
getback Sun Aug 16, 2015 1:31 pm
Thanks Ken , its a Fox FAI .049 1964 According to RC Groups , Just a reck. http://www.rcgroups.com/forums/showthread.php?t=1566800 Strange it has no Marking on it and little Comp.
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Re: What engine is this Please
duke.johnson Sun Aug 16, 2015 1:59 pm
I know what kind, AN AWESOME one!
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Re: What engine is this Please
Oldenginerod Sun Aug 16, 2015 5:15 pm
Definitely a Fox. Could be an .049 or an .07 and I doubt that it's the FIA model, though a more knowledgeable person could prove me wrong. I think the FIA model mainly differed in the porting and other internal features rather than external appearance. If it has a shiny ground-off patch on one side of the crankcase below the exhaust then it's a Comet model. The angled intake tells me that may be the case. Fox Comet engines were produced for Comet RTF aircraft. When the relationship with Comet failed (OK Cub got the contract), Fox had a heap of left-over engines with the Comet logo which he ground off, removed a lug under the front of the case and angled the intake, just to alter the appearance enough for people to believe it was a different engine.
Rod.
Rod.
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Re: What engine is this Please
getback Sun Aug 16, 2015 5:44 pm
I just went over it with a magnifying glass and light no flat 's under the ehx. or # to be found ,, the only flat is between the carb. and cly were its bridged for support , They sure didn't clean up the mold seam at all . What is FIA ? any who . And the Salsa Is alright but could bee Hotter 
Eric PS; maybe at the end of production where it was about over for the CO. , Friday engine ?
Eric PS; maybe at the end of production where it was about over for the CO. , Friday engine ?
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Re: What engine is this Please
Ken Cook Sun Aug 16, 2015 6:30 pm
The FAI version came out in 64 I believe. This was a special contest designed engine. While it looked the same, it was very different recognizeable by the angled exhaust ports. This closed the exhaust timing earlier and also upped the compression a bit more. FAI Fox .049 engines usually have a matte sand finish case which looks to be bead blasted. Ken
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Re: What engine is this Please
Cribbs74 Sun Aug 16, 2015 6:34 pm
The FAI has angled exhaust ports. Hard to tell from the picture, but it appears to be a standard .049.
Still a good engine though, they make brass inserts so it will accept a Cox head.
Edit: Dang it!! That's twice today Ken...
Still a good engine though, they make brass inserts so it will accept a Cox head.
Edit: Dang it!! That's twice today Ken...
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Re: What engine is this Please
getback Sun Aug 16, 2015 6:51 pm
One thing for sure it has internal probs. you can turn the crank 1/3 turn before it moves the piston // piston has a dome ? tit top to it hope you can see it 
yes that's the best my phone will do >
yes that's the best my phone will do >
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Re: What engine is this Please
GWILLIEFOX Sun Aug 16, 2015 7:09 pm
It is a regular Fox 049 NOT an FAI. Besides the angled exhausts, the FAI has a larger crankshaft. All the Fox 049s have the dome on top of the piston. Its actually the head of a rivet that holds the conrod socket in place. The prop drivers on these are very sloppy. Do you have the play with a prop tightened down?
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Re: What engine is this Please
getback Sun Aug 16, 2015 7:33 pm
not a prop but removed the sc. and nut that was on it and grabbed it by the bare shaft still a lot of slop / rivet 
that's something else there that it still looks that good .
that's something else there that it still looks that good .
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Re: What engine is this Please
stevej Mon Aug 24, 2015 1:16 pm
Besides the angled exhaust ports, an easy way to tell the FAI version is the 8-32 prop nut on a threaded crankshaft, also used on the .07. The standard Fox .049 used a 4-40 prop screw. The FAI also had a bit bigger venturi inside diameter.
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Re: What engine is this Please
Mark Boesen Mon Aug 24, 2015 5:19 pm
Steven,
The the threaded crank replaced the prop screw in '62-'63, on all versions.
The the threaded crank replaced the prop screw in '62-'63, on all versions.
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Re: What engine is this Please
stevej Mon Aug 24, 2015 6:34 pm
Right you are, Mark. I have an .049 with the threaded crank. It has the 'rib' fins on the side of the case.
Mark Boesen wrote:Steven,
The the threaded crank replaced the prop screw in '62-'63, on all versions.
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