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HelicopterEngines Plugs Mufflers Fuel › Decent alternative to OS #8 Glow Plug
04-28-2004 03:37 AM  13 years agoPost 1
dkshema

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Cedar Rapids, IA

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Does anyone have a decent alternative to the highly touted OS #8 glow plug? Have any of you run across bad batches of the #8?

I bought a batch of 6 about two months ago. Tonight, I went through three of them just trying to get my OS 50 powered EVO started. The first one had three tanks of fuel through it. The engine started, idled well, as I began to spool up the heli, the engine just quit dead cold. After three more tries on this plug, I removed it, and replaced it with a NEW OS #8. I fired up the engine, and as soon as I removed my starter nicad -- the engine died. As long as the battery remained connected, it ran well.

I removed that plug, and replaced it with a second NEW OS #8 plug. Same thing yet again. Engine started, idled and ran fine, until I took my starter nicad off. The engine instantly died. As long as the battery is connected, it worked fine.

I replaced that plug with a third NEW OS#8, it ran fine. No problems. Didn't have to touch anything else.

The three bad plugs all visually look great, all were brand spankin' new.

I switched to the OS #8 last spring, and noticed these plugs die often, and without any warning. The most common failure mode is that the engine will start fine, idle fine, but as soon as you begin to open the throttle, they just quit instantly.

They've died in OS 32's, OS70's, and OS 50's, all running Sig 15% heli fuel -- the stuff I've used for years and years without having plug troubles.

So -- what's a good alternative to the OS #8?

Dave

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04-28-2004 03:39 AM  13 years agoPost 2
pepper

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GREAT STATE OF TEXAS!!

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NO QUESTION ASKED--- ENYA #3

pepper
GOD BLESS

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04-28-2004 03:40 AM  13 years agoPost 3
rckrzy1

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Hurst Texas

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sounds like a bearing going bad in that os50, very common symptom.
But enya 3's are what I use.



Wildcat Fuels

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04-28-2004 04:33 AM  13 years agoPost 4
dkshema

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Cedar Rapids, IA

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Bad bearing in only five tanks of fuel?

And three glow plugs on the same tank?

Dave

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04-28-2004 06:47 AM  13 years agoPost 5
JWBurns

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The Lone Star State, Dallas Texas

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I vote for the bearings going bad as well.

I just went through three plugs myself thinking I was having the same problem as you. It's not the plugs as they will glow red hot on your driver.

Are you saying you only have five tanks on the life of the motor? Are you the original owner?

After 6 gallons my OS 50 gets new bearings installed tomorrow.

After OS 8's Enya 3's would be my second choice, Enya 4's and 5's on very warm days.

Jason

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04-28-2004 09:26 AM  13 years agoPost 6
donlynn

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New Zealand

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Gidday

I too did exactly as you have done then I removed the backplate and discovered a corroded bearing, replaced both bearings and another plug from the same card and all was sweet !

I tried enya 3 same performance for me as the os 8, the os8 was cheaper so I run os8

Regards Don

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04-28-2004 03:36 PM  13 years agoPost 7
rob_jones

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Perry, GA

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ENYA #3

Nuff Sed.

Blade 550X, T-Rex 450 Pro FBL

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04-28-2004 04:18 PM  13 years agoPost 8
T.C.

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Nottingham. England.

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My 1st choice is alway's OS #8, 2nd would be Enya #3,

Never had a problem with either, only change to Enya #3 if I want a slightly hotter plug.

Tony

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04-28-2004 04:55 PM  13 years agoPost 9
poerQwa

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Rotterdam, The Netherlands

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Dkshema,

You state that when the glowdriver stays attached everything is fine, if you take it off the engine dies. Sounds like idle way tooooo rich.

Greetz,

Marc

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04-28-2004 06:03 PM  13 years agoPost 10
Dr.Ben

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Richmond, VA, USA

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As stated, this likely is not a gloplug issue. OS 8's have an excellent lifespan in a healthy, well tuned enigne. The first place to look is the rear bearing, unless there is some kind of overvoltage on your glow driver, which would appear unlikely. I've seen brand new engines/bearings do this.

Ben Minor

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04-28-2004 06:29 PM  13 years agoPost 11
Raptor Rulezzz

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Rockanje, Zuid-Holland - The Netherlands

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Decent alternative to OS #8 Glow Plug
Enya #3, but the OS8 should work too... Enya #3 would work better&longer though in my experience...

Cheers,

Rich\

.



Proud Member of Team QuickUK, Team Duralite & Sponsored by V-blades & 4rc.nl

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04-28-2004 06:30 PM  13 years agoPost 12
Chopper

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Stow,Oh- oops, I mean St Louis, nope Stow again,

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My impression from the original post is that the plugs also looked perfect when you took them out. If metal gets on the plug, it will burn it out, but I don't think that is what Dave is trying to say.

Well, I run the OS#8 , and have for many years....except the one year when the engine would flame out. I would be hovering,..engine running perfectly...flame out. Like someone turned the key off. Forward flight, 17,000 rpm engine running perfectly, flame out. No explanation. Changed to new OS #8, same results. Changed again, same results different conditions. Changed everything in the fuel system, same results. Changed to the Enya #3, problem went away.

For awhile, I thought it had to be silicone working its way back into the engine from the exhaust. It will do that with silicone pieces in the combustion chamber. I went through everything I could to find the problem. The only thing that would fix the problem was an Enyas #3.

I just figured I had a bad batch of OS #8 plugs. At the time I was well within the top ten FAI heli pilots, so...yes the needles were set right. The engine would just stop cold. Strangest thing. I went back to the OS#8 the next year and had no problem. The answer is a resounding yes, under certain conditions the OS #8 plug will do exactly what you describe. Good element, good glow, new plug, but the engine will quit dead from 12k to 17k rpm or anywhere lower. Until then I would have answered the question like those above.

IMHO, if the conditions are as I assume, yes, you have a bad batch of plugs.

Paul Soha

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04-28-2004 06:53 PM  13 years agoPost 13
shootist

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New York State, East Coast US

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Boy, I thought I was crazy. I had a sheet of OS8's last year that wouldn't stay lit. No change in anything, but the glo plugs had to be replaced every few flights. Some on that sheet wouldn't start the engine at all.

A few Enya #3's convinced me the sheet of OS8's was bad. Sure enough, a new sheet of OS 8's and I have no problem.

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04-28-2004 11:39 PM  13 years agoPost 14
dkshema

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Cedar Rapids, IA

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Various questions above:

Yes, New engine, new heli, and yes, only five tanks of fuel through it.

No, Idle and/or top end are not lean, or rich. The first three flights on this machine: the initial two were hovering any where from just above ground level to about 40 feet altitude. This included going from near ground level to the 40 feet or so by simply goosing the throttle up to max momentarily to check the transition and mid range.

Third flight was a normal flight -- full plus a little of the header. Included loops, rolls, pirouettes, flips, inverted. Engine NEVER missed a beat, never bogged down, never burped.

Fourth tank of fuel is the one that did it. Took the heli out about a week after the third flight. Filled the tank, fired up the heli, set it out on the runway, advanced throttle, poof -- instant dead engine. Replaced the plug. Started, idled, advanced throttle, instant dead engine as soon as nicad was removed.

Started again, ran idle screw on OS 50 from full CCW to Full CW -- no difference. Also ran the high speed needle from about two turns out, to closed -- made no difference.

As long as the battery is on the plug, all is well.

Reset the needles to middle on idle, about 1 1/2 turns out on high speed. Insert second new plug, restart engine. Same thing. Works fine when plug has battery on it, dies instantly when battery is removed. Needle settings make no difference.

Remove second plug, install third. Fire up engine, works fine, no problem. Hover out an entire tank. Refuel, fly a second tank out while pretty much wringing the helicopter out.

So -- first plug died after three runs. Second and third plug basically were dead out of the package. Fourth plug runs great. For how long, I don't know at this point.

All three "bad" plugs appear normal, even under some decent magnification.

Sent note to OS explaining problem -- their reply was "either the carburetor is set wrong, or the plug is bad". Believe me, after 39 years of tuning RC motors, it ain't the carb setting. That would also not explain why a plug that ran fine for three consecutive tanks dies on the fourth tank, without the carb being touched.

I also asked them about rear bearing problems in the OS 50 here is what they have to say:
We'd highly doubt the bearings, as some have supposed. Unless the
engine has been idle in an extremely adverse environment, the bearings
would not go bad in three runs.
They kind of ignored the whole bearing question, in my opinion.

So -- it might just be a bad batch of plugs, maybe it's time to switch to those Enyas...

Dave

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04-29-2004 08:46 AM  13 years agoPost 15
drsuessmn

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Ellendale Minnesota USA

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I had a problem on my tt .39 that when I brought it up to hover speed one day poof dead engine tried new plug nothing tried new plug again nothing again tried adjusting idle screw nothing changed engine all better after dissassembly (this motor had about 8 tanks on it) con rod was removing casting from the crankcase crankshaft had a lot of play sleeve was scored piston was starting to disintigrate since I am new to all of this fun I sought out some extra help and came to the conclusion that this one was self inflicted I ran it too lean
this is just a testimonial no implications are to be assumed by it

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04-29-2004 01:26 PM  13 years agoPost 16
Colibri

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The Netherlands

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Without heaving read all the replies: Any chance there is another foreign body in the engine other than parts of the bearing. Maybe a piece of piston ring or maybe a piece of dirt or metal from the manufacturing process? Any foreign body will kill the plug in no time.

I would open up the engine and check it out.

Tim

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04-29-2004 11:59 PM  13 years agoPost 17
dkshema

rrMaster

Cedar Rapids, IA

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Nope, nothing inside but engine guts, and they're all where they are supposed to be.

Dave

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HelicopterEngines Plugs Mufflers Fuel › Decent alternative to OS #8 Glow Plug
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