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HelicopterThunder TigerOther › Brown dots on the muffler - engine tuning?
05-31-2004 04:04 PM  13 years agoPost 1
xibit

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Arendal, Norway

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I have hovered 4 tanks with my new Raptor 50, and after the last flight I noticed some small brown dots on the muffler and where the muffler connects to the engine. I tightened the screws that holds the muffler, when the engine/muffler was hot and it was a bit loose.

My question is: What is this brown stuff, and is it normal? Has it something do do with me running the engine to lean/getting too hot? I have only adjusted the high speed needle for now, and it doesn't seem to influence how the engine performs too much. By the way a TT50 PRO. Started with the high speed needle at 3 turns out, but the engine got hot. At the moment it's 6 turns out, but still hot. Can't hold my finger on the back plate for more than 3-4 seconds.

Have read about the low speed needle influencing as much as 75-80% of the throttle range, so I should probably richen the low speed needle quite a bit?

Please help, thanks.

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05-31-2004 04:08 PM  13 years agoPost 2
pepper

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what fuel are you useing?


pepper

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05-31-2004 04:10 PM  13 years agoPost 3
xibit

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Arendal, Norway

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Model Technics, 16% nitro, 20% oil.

Bought it at my local hobby shop, which is a Kyosho shop.

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05-31-2004 04:12 PM  13 years agoPost 4
pepper

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oh, never heard of that fuel?? if it's anything like the old byron, the oil would get cooked on the muffles causeing spots..

pepper

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05-31-2004 04:14 PM  13 years agoPost 5
xibit

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Arendal, Norway

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So it doesn't necessarily mean that I'm doing anything wrong? Is this a sign of low quality fuel? And how can I remove those dots?

It's also written QwikFire 16 on the fuel can.

Thanks.

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05-31-2004 04:17 PM  13 years agoPost 6
pepper

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the only way i know of to get rid of the spots is to stick the muffler in the oven and crank her up. pull out and wipe clean. i think that is how they do it..
it has to do with nonsynthetic oil. i think that is how you spell it??

pepper

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05-31-2004 05:26 PM  13 years agoPost 7
drdot

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So. California, Orange County.

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My two cents..

Idle needle is much too lean...Go back to 31/2 turns out on the main, then adjust low end needle for an idle that is so rich the engine will barely idle,,,You will have to increase throttle trim as you make this adjustment,,, Brown spots are probably from castor oil in the fuel...I'd suggest switching to all synthetic asap...


John.

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05-31-2004 05:31 PM  13 years agoPost 8
cycloneflyer

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southampton .England

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I think the brown dots are castor oil stains .Pretty sure Model Technics put a small percentage in there fuel. Castor has better protection from lean runs as the oil boils at about 100 degrees higher than synthetic oil but the downside is the staining it leaves behind. Apparently it can gum up the internals of the engine in the long run.
I think you will have to weigh up the pros and cons - if you want a nice clean residue free machine go for a fuel with 100% synthetic lube.

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05-31-2004 06:19 PM  13 years agoPost 9
cjw

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UK - Cheshire

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Yep,

The stains are from the castor oil in Model technics. I used it when I first started for a few gallons on my Caliber, and it left the same sort of brown marks. Synth oil fuels like Collpower or Magnum don't leave those marks.

You could also try removing them with Brasso.

Clive

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05-31-2004 06:28 PM  13 years agoPost 10
xibit

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Arendal, Norway

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Thank you for all the replies.

I've read many places that the low needle doesn't need adjustments, and that it should be left at factory setting. Well, checked it now, and it was turned fully clockwise!!

So I have been flying 4 tanks with 0 turns on the low needle and 6-8 turns on the high needle
Hope I haven't "destroyed" the engine?

It ran great on idle, and never died when using these settings though....

Have adjusted both low and high to 4 turns now, and will check from there.

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05-31-2004 07:09 PM  13 years agoPost 11
rotary_aviator

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Norway

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Du må ikke finne på å bruke den fulen der!

Noe skikkelig søl. Du må ha Model racing fuel. Kjøper den hos rune Lillestø. Han har også masse raptor deler. Bor på asdal. Gi beskjed dersom du ikke finner nummeret hans.

kev

Im just giving hin directions for a local supplyer of decent fuel, not the greasy gue hees running now.

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05-31-2004 09:28 PM  13 years agoPost 12
xibit

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Arendal, Norway

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Rotary_Aviator: Jeg bor nesten like ved han, er fra Bjorbekk. Kanskje jeg skal ta kontakt med han en dag da. Ble litt søl, men ikke så mye i dag. Det ser ikke bra ut med slike flekker. Er den fuel'en mye dyrere? Jeg betalte 295 for 4 liter i butikken på Stoa.

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06-01-2004 03:00 AM  13 years agoPost 13
ASchlem

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St.Louis

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I got the castor stains off with hot water and dish soap. Took a little elbow grease but it came clean. The castor will help protect the engine in a hot run, so it's worth cleaning off to me.

Aaron

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06-01-2004 03:30 AM  13 years agoPost 14
Raffy

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Chicago, Illinois

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While the muffler is hot, I spray it with glass cleaner to keep the muffler looking new all the time.

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06-01-2004 08:39 AM  13 years agoPost 15
xibit

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Arendal, Norway

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Thanks for the tips everyone

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HelicopterThunder TigerOther › Brown dots on the muffler - engine tuning?
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