By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by CML

Small engines big hassle

All Topics | Latest Posts

Search for:  in Thread Title in  
bert baker08/10/2017 10:32:56
avatar
1380 forum posts
297 photos

So I built a plane for these little engines, the first one had a fuel pipe up to a Venturi like a normal glow pylon engine, that did work until the tank broke,

Having these other two as spare engines I thought just fit them and fly, but they won't run more than 2-5 seconds, have stripes down and cleaned them, I rather fancy because I only try to use them once a year this may be a problem,,,,,is there any special things I should be doing with them to maintain reliability

Percy Verance08/10/2017 11:18:03
avatar
8109 forum posts
155 photos

More details might be helpful Bert, such as the fuel and plug types you're using........oh, and if you tell us what the engines actually are as well?

Martin Harris08/10/2017 11:20:44
avatar
8736 forum posts
214 photos

Might help if you tell us what these engines are...make, fuel type etc?

Personally, I don't recall seeing any engines with stripes down them...cheeky

Denis Watkins08/10/2017 11:54:56
3811 forum posts
52 photos

Bert, don't keep stripping them down, parts can be assembled wrongly, e.g piston backwards, and bits can be left off.

By the small size you suggest, they could be diesels, but the guys need fuel type and motor name.

The small metal fuel can is a clue, and is there a glow plug in the cylinder head

Or is the head one piece with an electrode

Or is there a bar to be screwed up and don't on the cylinder head

These guys can help you

bert baker08/10/2017 11:57:45
avatar
1380 forum posts
297 photos

img_1548.jpgOh yeah, must have been day dreaming when I did op,

I was suppossduto do pics but got side tracked

They are Cox 0.020 I think

bert baker08/10/2017 11:58:23
avatar
1380 forum posts
297 photos

Stripped not striped only had backs off not touching piston or crank 

Edited By bert baker on 08/10/2017 11:59:46

Percy Verance08/10/2017 12:15:41
avatar
8109 forum posts
155 photos

Right Bert

They look a bit like Cox or McCoy engines to me. You wouldn't by any chance be trying to run them on normal glow fuel Bert? If you are, you'll be trying for rather a long time. These engines need a high (at least 15%) nitro content in the fuel, and won't run at all well on anything less. The glowheads need to be in good condition too, otherwise they soon go off tune.

I seem to remember reading somewhere that the glowheads - it's a complete glowhead, not a plug - are getting harder to source these days. I think someone does (or did) a head conversion to take normal type plugs, but I've been wrong before.......

Back in the days when I flew CL, mine were mainly McCoy engines. I can't recall owning A Cox, although a fellow club member did have both an .010 and an .020

Oh, and the glowhead needs just 1.5volt Bert. Don't use a 2v job on them.......

 

 

Edited By Percy Verance on 08/10/2017 12:34:24

Ron Gray08/10/2017 12:32:24
1432 forum posts
359 photos

I used to run Cox engines, TeeDee 010, PeeWee 020, Babe Bee 049, Golden Bee 049 and the best of them all a Black Widow. All needed to be run off very high nitro content fuel (as you state in your post Percy) and the glow heads on the smaller ones just didn't last that long. The needle jets were also prone to gumming up and needed to be kept clean a symptom of this was that after priming through the ports, they would run for a few seconds then die.

All were screamers and extremely noisy (none of mine were silenced apart from the Golden Bee which had a ring muffler and killed the performance as well as the noise).

Percy Verance08/10/2017 12:37:31
avatar
8109 forum posts
155 photos

That's it Ron, no silencing. I can't remember it being a *big* noise though Ron. You'd probably struggle to hear it 2 or 3 hundred yards away. And yes, the glowheads didn't last long. I used to buy whole cards of them at a time!

From memory, I think one of my McCoy engines had a ring silencer on it.

Edited By Percy Verance on 08/10/2017 12:38:59

bert baker08/10/2017 12:37:42
avatar
1380 forum posts
297 photos

Have been trying 30% optifuel,

Tried a new head, using a 1.5 v batt I do have a good glow so that's not the issue for starting

bert baker08/10/2017 12:38:50
avatar
1380 forum posts
297 photos

I have a few 049 ones and do not have problems with them

Percy Verance08/10/2017 12:41:04
avatar
8109 forum posts
155 photos

Perhaps it could be the little valve thingy inside the fuel tank Ron? Butterfly valve??

bert baker08/10/2017 12:41:31
avatar
1380 forum posts
297 photos

img_0408.jpg

bert baker08/10/2017 12:46:59
avatar
1380 forum posts
297 photos

img_0391.jpgMight have to get a new tank for this one,

bert baker08/10/2017 12:48:26
avatar
1380 forum posts
297 photos

The old tank had a repair to pick up pipe before my ownership,,Ned problem will be where to get one

onetenor08/10/2017 12:54:52
avatar
1900 forum posts

All that has been said is true but no one mentioned that the reed valve can stick. You would have to find instructions for strip down but not sure where.Re the heads I converted one of mine to take a plug. Drift the insert out from inside then carefully tap using Model engineering tap .24TPI but can't recall diameter. but is dia of glow plug. Use first and second taps. Don't run them both right through. On second tap go in stages trying the plug for fit. I can look for taps if no one can tell us what size is.

 P.S. That plane would qualify for an ebenezer contest .

Edited By onetenor on 08/10/2017 13:02:57

bert baker08/10/2017 13:03:10
avatar
1380 forum posts
297 photos

Valve is ok have checked that the standard size for. Glow plug thread is 1/4 x 32.

Martin Harris08/10/2017 13:09:43
avatar
8736 forum posts
214 photos

A.K.A. 1/4" UNEF

bert baker08/10/2017 13:20:26
avatar
1380 forum posts
297 photos

Could try a new engine img_0361.jpg

Piers Bowlan08/10/2017 13:55:00
avatar
1826 forum posts
44 photos

Yes that would do it Bert but I fear the model might rotate faster than the prop - but not for very long!

As you can see, the reed valve is held in place by a spring and is easily removed and cleaned in meths or similar. As has been said earlier, remove and clean the needle valve and spray carb-cleaner or meths down the orifice to get rid of congealed fuel/oil and foreign matter. There is not much to go wrong so if the fuel is at least 15% nitro, fresh and you have a decent glow from the plug it should start and continue to run. Hard to believe that such a small engine can make such a loud irritating noise! I spent a lot of my misspent youth playing with these great little engines.

All Topics | Latest Posts

Please login to post a reply.

Magazine Locator

Want the latest issue of RCM&E? Use our magazine locator link to find your nearest stockist!

Find RCM&E! 

Support Our Partners
Addlestone Models
Wings & Wheels 2019
electricwingman 2017
Slec
CML
Cambridge Gliding Club
Gliders Distribution
Pepe Aircraft
Sarik
Advertise With Us
Latest "For Sale" Ads
New Poll - Sticky situations...
Q: How often - when using superglue - do you end up with it on your fingers?

 Every time
 Occasionally
 Sometimes
 Rarely
 Never
 Wear rubber gloves

Latest Reviews
Digital Back Issues

RCM&E Digital Back Issues

Contact us

Contact us