stunthanger.com
Engine basics => Engine set up tips => Topic started by: Motorman on May 18, 2017, 09:56:48 PM
-
blank
-
I'd leave it off for a flight,or drop down in pitch an inch or two.
Mike
-
One possible problem is Engine break in
It seems you are talking about the Enya 45 6001 with plain bearing that has an iron piston. Enya Iron piston engines needs special break in. The iron piston will grow more then the sleeve when it gets hotter and when the engine is not fully broken in it will sag when going up as the temperature rise and the piston expand causing to much friction.
Some people say it will take a long long time to break in an Enya Iron engine and that is true if you do not use the proper technique. Enya Iron engines takes no less then 40 min of bench running and it should not take longer then 1:30H for the tightest engine. The time will depend how tight the P/L fit.
I know of people that ran an Enya Iron Engine for 5hours on the bench and the engine still sag when going up. The mistake was running the engine constant rpm and a bit rich. This way it will never break in.
This is how I break in my Enya Iron Engines:
Fuel 0% Nitro 20% castor oil only
10 runs of 1 min. needle so the engine is burbling between 4 and 2. Let the engine fully cool before starting again
8 runs of 2min. with the same setting
4 runs of 3 min. same setting.
5 runs of 6 min. with the needle in the same setting but this time pinch the fuel line to sustain peak rpm for 10s, then wait 20s and repeat pinching process til the end of the run. Start pinching the fuel line slowly and watch the rpm to increase slowly, if engine start to lower rpm you went to far, back up a bit. The idea here is to make the engine run as hard as it can for 10s. If you can, measure the maximum sustain RPM. You should notice that this number will improve. If after the 5 runs you still notice that the top rpm is still improving do a few more runs like this.
You should avoid running the engine deep 4 stroking during break in or when new, it will put a lot of stress on the conrod/crank pin and that *can* cause premature wear of the conrod brass bushing.
For the Enya 45 Iron I suggest using a 10x5 prop for break in on the bench.
If the engine is four stroking in level going this fast, it does not sound the problem is the chip muffler.
Martin
-
Heating in the climbs and cooling quickly in the dives can do that. I'd give both some more running time. With the B.40, blocking off cooling to the cylinder head will probably help, because it'll reduce the pinch. It's a bit surprising that the engine temp would change that quickly, but it does. "Pipemaker Mike" made a nice "head cozy" out of balsa and plywood that cured his B.40 from stopping on the down stroke of the RWO. I doubt if the pictures are still accessible, but might be worth a try. Meanwhile, I'll search my folder to see if I saved them.
Speaking of the B.40...does anybody know if they are assembled in Moldova, or imported in pieces and assembled here in the USA? I read that you order a new piston and a new cylinder, and hope they fit together. That's just so wrong. :o Steve
-
Can someone please tell me what a "Chip Muffler" is.
Thanks,
Rusty
-
Tounge muffler
-
Tounge muffler
I wondered if that might be it, but I've only recently heard it called a chip.
Thanks for clearing that up.
-
Old Enya 45 crossflow plain bearing 10/25 fuel 11-5 mas on a 575 sq in profile. Plane is flying too fast (4.9 sec) and full 4 stroking, pull up into an inside loop and the engine saggs like there's too much load. Could the chip muffler be too much restriction when it breaks into a 2 stroke it can't breath? It doesn't even sound like it breaks into a 2 stroke, it just boggs. I've never heard an engine thin out like that. I'm wondering what to try next, more holes? it's already too loud. What do you think?
Thanks,
MM
There is so much of this description that doesn't make sense. On a model that size, with that engine, it probably weighs in at 50 ounces or better and you should be on at least 60 to 62 foot lines or more. if it's at "full four stroke", I doubt that you are doing a 4.9 second lap and are not reading your watch correctly, or you are really on 52 foot lines. At "full four stroke", it might not even get off the ground. If it does get in the air and you pull the nose up, at "full four stroke" it probably will and should bog down because it is too much load for that RPM and would never break into a two stroke.. A Mater Air Screw 11-5 plastic prop ain't gonna pull your hat off your head at that RPM much less fly a model that size at a 4.9 second lap. It just doesn't add up.
Type at you later,
Dan McEntee