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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › Eating glow plugs like candy
05-29-2012 01:16 PM  6 years agoPost 21
JPhillips

rrVeteran

Waco, TX

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2200 on a Raptor?! Hope you're running metal grips. I ran 2100 on mine and it flew great. You have to find the sweet spot for your engine and you're well over that. You are running way too hot.

Also, are you using any rtv silicone or anything to attach/seal your pipe? Excessive amounts can and will cause you problems like you're experiencing.

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05-29-2012 01:37 PM  6 years agoPost 22
HeliSam

rrApprentice

Michigan

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Agree with ravenhyper50, you need new bearings. I had this happen to my raptor before I sold it. She was eating all of my glow plugs! I replaced the rear bearing and it ran soooo much smoother and with more power

Sam

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05-29-2012 02:17 PM  6 years agoPost 23
EASYKILL

rrApprentice

Sonora,Ca - US

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I too have been having the same problem. Just switched from Wild cat to the Magnum 30% (not DS). While using the Wildcat I did not loose one plug, about 2.5 gallons into the Magnum and I have gone through at least 8 plugs. Bad batch? I hope not because we ordered a 55 gallon drum!

Hello, my name is Tony and I'm a heli addict...

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05-29-2012 05:24 PM  6 years agoPost 24
jschenck

rrProfessor

La Vista, NE.

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replace the fuel line inside your fuel tank - I'm guessing lean run due to fuel tubing inside the fuel tank. but I didn't read the entire thread here either.

Also if the engine is slightly flooded when you try to start it the raw fuel will bend the plug coil

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05-29-2012 05:29 PM  6 years agoPost 25
HotsHabit

rrVeteran

Idaho

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I sure appreciate everyone's comments and suggestions but I sure wish people would read the full post before commenting. The is no rtv being used at all anywhere on the machine, the bearings in all 3 motors are all new, including 2 of them have the magnum glide bushing installed. The fuel mixture is rich enough that I am getting tail kicks.

The glow driver is a good suggestion I hadn't thought of but it is just a standard c cell unit with the little gauge on the top that I have used for a few years, McDaniel brand with the orange plastic cover.

Keep the ideas coming please but we can rule out bearings, rtv, and too lean of a mixture.

Edit: fuel line in all machines is new but because of the rich conditions partially flooded starts is a possibility.

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05-29-2012 05:51 PM  6 years agoPost 26
airdodger

rrElite Veteran

Johnston USA

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You can get tail kicks when lean too. You can think as you want when you have frosted coils and oil color on the plug after a couple of flights you do not have the right mixture. Good luck.

Chris

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05-29-2012 06:15 PM  6 years agoPost 27
StephenIII

rrNovice

Boonton, NJ USA

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The Magnum 20 Heli plus is 22% oil. Thats a lot of oil to fuel. I would suspect you are running a little lean even with a trail of smoke. Open the main needle up maybe three to four clicks. Also, how old is your fuel? All three of your helis have the same symtoms.

SJW

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05-29-2012 06:51 PM  6 years agoPost 28
HotsHabit

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Idaho

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The fuel is fresh this season, like 2 months ago. I am pretty sure the mixture is too rich because transitioning from idle on spool up is sluggish and it alternates between 2 and 4 cycle at lower rpms.

I was concerned about being too fat on the bottom and it being disguised as rich on the top so I have leaned the bottom side by about 1/16 past stock.

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05-29-2012 06:53 PM  6 years agoPost 29
HotsHabit

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Idaho

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airdodger

Out of the 4 plugs one is frosted, the rest still have a pretty good shine on them.

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05-29-2012 07:47 PM  6 years agoPost 30
airdodger

rrElite Veteran

Johnston USA

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I would open the high as much as it will take, then go back to the low and get a clean transition. You have to tune the engine to the way you fly, meaning you can't just loaf around and get the setting you will need when you are doing heavy 3D. The engine will require more fuel the harder you push it. If that does not solve the issue next would be the shim. I like shims because you can stuff more fuel and the tuning becomes less critical. If it's just starting to detonate the shim will help that too. Remember the piston is making around two hundred seventy firings a second, so even one click means something. Nitro is funny stuff, sometimes you think it's too rich and it's too lean or just the contrary. You want to know for sure pull the muffler off and look in the exhaust port, if the piston looks dry or burned oil below the ring and you are burning oil at the port you know the problem.

One of the old ways we used to use was fly it hard for a while then hit throttle hold , if the engine was hanging on the pipe and did not come instantly down to idle we knew it was too hot, lean.

Chris

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05-29-2012 08:52 PM  6 years agoPost 31
HotsHabit

rrVeteran

Idaho

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Sitting at idle, if you pinch the fuel line it takes about 4 seconds for it to die. I will fatten the top end and try it and will more than likely have to lean the bottom some more.

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05-29-2012 09:07 PM  6 years agoPost 32
TMoore

rrMaster

Cookeville, TN

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Sounds too lean on the bottom end to me.

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05-29-2012 09:18 PM  6 years agoPost 33
HotsHabit

rrVeteran

Idaho

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How long should it take to die when the fuel line is pinched off?

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05-29-2012 10:38 PM  6 years agoPost 34
TMoore

rrMaster

Cookeville, TN

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6-8 seconds

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05-29-2012 10:50 PM  6 years agoPost 35
Rsams

rrApprentice

Fort Dodge, IA

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I dont think it is the headspeed. I am running the same motor at 2200 on the head with an 8.6 to 1 ratio. We dont eat plugs. Might lose one once in a while but that is after a bunch of flights. Yes we beat on it pretty hard but I didnt set this thing up to do any weanie flying.

Ryan,Team JR, Team Morgan Fuels, Team KDE Direct, RCBearings.com Tech Rep

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05-29-2012 11:19 PM  6 years agoPost 36
rotor head33

rrApprentice

Louisiana-United States

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the pinch test is ok but why not see about transition from idle. let idle for a bit say minute then start easing up the throttle and see if its loaded up or gurgles. if its lean it will stutter and start up pretty rapidly. you want to aim for a steady idle "lope" or smooth run and when you go to ease up the throttle its a smooth transition no pinging but no loading up either

Power is nothing without control

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05-29-2012 11:21 PM  6 years agoPost 37
rotor head33

rrApprentice

Louisiana-United States

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TMoore how do you calculate just the rpm's of the engine? id like to calculate this for my ys..

Power is nothing without control

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05-29-2012 11:23 PM  6 years agoPost 38
HotsHabit

rrVeteran

Idaho

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They all load up pretty good on transition from idle, enough that sometimes they cough and quit, you have to hurry and clamp the fuel line or the engine will be hydro locked.

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05-29-2012 11:24 PM  6 years agoPost 39
TMoore

rrMaster

Cookeville, TN

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HS x first gear ratio assuming simple gearing.

In this case 2200 x 8.5 = 18,700 at the driver gear.

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05-29-2012 11:25 PM  6 years agoPost 40
rotor head33

rrApprentice

Louisiana-United States

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Ummmmm caugh and quit isn't good transitioning bud. I agree it may be lean. If its too rich it will gurgle not cough.

Power is nothing without control

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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › Eating glow plugs like candy
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