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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › Muffler question and a fuel question.
03-07-2012 09:23 PM  6 years agoPost 1
coolgabsi

rrApprentice

Plano TX

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Guys...

Last time I put the engine together I used a layer or 30inute epoxy between ye muffler and the engine exhaust port.

I was flying and the bird felt like it was lean by the last tank last week. Luckily I was thinking of changing the engine bearings. So I opened the engine anyway. I noticed I had splatters of burnt fuel on the side of the muffler facing the engine.. Now was it burnt fuel or was it just some windex residue.. (it was dark grey.., and was wiped off quite easily..) ..

Now whatever it was, I saw that the epoxy was dark brown on the engine and kind of burnt or heated..

So this time I cleaned the engine port and muffler intake and I just tightened it straight on. Last time may be epoxy burnt off leaving a gap... Don't know.

My other .50 has no epoxy between the engine and the muffler.

I am wondering if I need something there? What do y'all use? I have a os-50 hyper and a mp5-50 on both.

Fuel question.. Going from 15percent to 30 percent I go richer on the engine right?

Do yall like rotor rage?

People call me crash master... for a reason.. :P :D

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03-07-2012 10:05 PM  6 years agoPost 2
Santiago P

rrProfessor

South West, Ohio

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From 15 to 30%, yes go richer.

You "may" need a to shim the head about .008 if you detect knocking or preignition.

rotor rage is good stuff.

Santiago
Magnum Fuels Rep

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03-07-2012 10:23 PM  6 years agoPost 3
coolgabsi

rrApprentice

Plano TX

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i dont think i am having knocking issues..

i am more concerned with the muffler intake and the exhaust port of the engine if i need a shim or gasket or something there..

and thanks for the input on the pin settings

People call me crash master... for a reason.. :P :D

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03-07-2012 10:31 PM  6 years agoPost 4
gftazz

rrVeteran

upstate N.Y. in the Adirondacks

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I've never run any.
Your dealing with machined surfaces so should be a good fit. I and all the guys I fly with don't use anything there and never had a problem. Put muffler on and after frst flight check to retighten any after it's got up to operating temps. Good to go. You don't need any head shim on an OS50 and I use the MP5 on a couple of mine with 30% magnum fuel and my main needles on the couple engines were at 1 turn out on the high needle, the idle was factory stock. I'm sure I could go in a bit more on the highs but they work fine and aren't anywhere near too rich or too lean. I use OS#8 plugs too. I'm at about 350' above sea level just so you know.

Oh No Someone Please Stop Me Before I Go Broke With This Heli Thing!!

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03-07-2012 10:38 PM  6 years agoPost 5
coolgabsi

rrApprentice

Plano TX

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now funny that you say this.

my engine is on stock low speed needle, may be a degree or less lower.. but not at all too much..

I was on 1 turn and 8-9 clicks out (almost half turn in 5 more clicks i think) and i went inverted and i was lean.. i have OS bubbleless and also very soft clunk line for maximum coverage inside tank.. I am running OS #6..

I am in texas (DFW area. The weather was a little humid and a bit cold then.. ) but i went inverted i had barely enough power to hold the bird..

i am suspecting the muffler must have leaked a bit. I am gonna do the tightening when its hot.. that seems like a god idea!

but i am just learning to tune the engine, and already have burnt my engine once in the process.. now i know NOT TO GO LEAN.. hahahahah..

so i am all the more scared of doing that. with mp5 50 .. after i went lean on that flight.. that kinda scared the heck out of me.. haha.. I am gonna put it back on and see how it does..

People call me crash master... for a reason.. :P :D

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03-07-2012 10:41 PM  6 years agoPost 6
airdodger

rrElite Veteran

Johnston USA

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An OS 6 is that correct?

Chris

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03-07-2012 10:45 PM  6 years agoPost 7
coolgabsi

rrApprentice

Plano TX

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yes the plug OS #6 ( i think its correct) its a hotter plug right..

RIGHT? lol

People call me crash master... for a reason.. :P :D

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03-07-2012 10:48 PM  6 years agoPost 8
airdodger

rrElite Veteran

Johnston USA

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I would try the eight.

Chris

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03-08-2012 12:53 AM  6 years agoPost 9
coolgabsi

rrApprentice

Plano TX

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i was actully using OS 8... but was told to go hotter for a better crisper transition ...

y'all let me know what you think!

People call me crash master... for a reason.. :P :D

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03-08-2012 01:42 AM  6 years agoPost 10
Gearhead

rrMaster

Vt

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Plug,,
you didn't say what Heli,, if (if) you are talking about your Century 50, (like I told you ), because the Century's Clutch/Fan Assembly is so light you may need to use a Hotter Plug than the #8,
the Hotter #6 burns more Fuel at lower RPMs giving a Smoother Idle and reducing Sputtering while Spooling Up, also the Hotter Plug should give a better Throttle Responds below 80% Throttle,

the #8, a Cooler Plug, should give a bit more power at Full Throttle,, so it's a Trade-Off,, Smoother Running with Better Throttle Responds giving a Crisper Collective Pop,, or less Throttle Responds with a tiny bit more Power at Full Throttle ????

Jim
Buzz Buzz Buzz

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03-08-2012 02:13 AM  6 years agoPost 11
coolgabsi

rrApprentice

Plano TX

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Hahahaahha!! I was sure you would be here somewhere Jim!! :P :P

I am not questioning your help. You have helped me too much!! Hahaha

My questions were answered here about other stuff though..

People call me crash master... for a reason.. :P :D

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03-08-2012 03:20 AM  6 years agoPost 12
airdodger

rrElite Veteran

Johnston USA

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I personally would not use a 6 with 30%, just my opinion.

Chris

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03-08-2012 04:42 AM  6 years agoPost 13
Gearhead

rrMaster

Vt

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""I personally would not use a 6 with 30%, just my opinion""

normally you wouldn't, but like a Plane Engine with a Tiny Prop the Century 50 Clutch/Fan Assembly is so light it does little to load the Engine at Idle and Spooling Up, plus the Century is Geared Low yet still putting less Load on the Engine at Spool Up,, no problem, the Hotter Plug give more Throttle/Collective Responds

Jim
Buzz Buzz Buzz

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03-09-2012 04:26 AM  6 years agoPost 14
Evan03

rrVeteran

Idaho

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The muffler seal has me wondering. If its leaking the motor will run like crap. Untunable..
Get that squared away then go from there. I'd cut a gasket or use high temp gasket maker or some kinda high temp rtv.

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