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IC Power / Re: Dark Oil from exhaust pipe
« Last Post by Stuart Mellor on Today at 05:03:18 PM »

Hi Mike,
You've defo got the right plug. The OS f will sort out any engine, 2 or 4 stroke. If you are getting the same rpm on both pipes - then I think the long one is not having an adverse effect & probably as hot as the short pipe?
 More length probably means a longer time for the oil to fry.

Assume the longer is quieter & that's the main reason you are using it?
Stuart
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IC Power / Re: Dark Oil from exhaust pipe
« Last Post by Mike Wood on Yesterday at 11:48:55 PM »
Good Plug  :)

Mike
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IC Power / Re: Dark Oil from exhaust pipe
« Last Post by Mike Watters on Yesterday at 10:20:33 PM »
Thanks Ashley, Stuart, Mike for your reply.


Gives me something more to have a look at.
I did tach The RPM with the standard silencer and it was pretty much the same with the pipe setup.


Quiet possibly the residual oil is burning off, as the pipe is mad hot, after a six minute flight, even with the pipe exposed to the air.


Might be worth a try moving the pipe in and out to see if there's any difference.


One thing I did notice, the plug is a brand new OS 'F' type, and when I removed it to have a look, the plug element looks a nice shiny colour, but the bottom plug casing is jet black.
Also, there's some blackening on the top of the piston too. Too rich setting ?


I'm starting to wonder why Hatori stopped making the longer pipes, switching to the more favoured shorter mufflers. Maybe from the problem I'm experiencing ?


Ashley, the model is a Prettner 'Mystic 90' made by EZ many years ago. A great flyer, if a little fast.


Regards Mike.
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Electric Power / Re: Zippy compact 5S 5000mAH
« Last Post by Mike Wood on Yesterday at 09:05:55 PM »
Sounds like a plan!

Mike
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Electric Power / Re: Zippy compact 5S 5000mAH
« Last Post by Nigel Armstrong on Yesterday at 07:40:58 PM »
Hi Mike.
All batteries are stored in lipo sacks and aluminium cases. Now in an outdoor storage unit away from the house.
See you at the Nats. Nigel.
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Electric Power / Re: Zippy compact 5S 5000mAH
« Last Post by Mike Wood on Yesterday at 07:29:00 PM »
Hi Nigel

Just wondered if you use that method of storing them in a concrete block.

Using the concrete block method worries me as I can't help thinking there may be tiny
sharp shards in there, that could cause a minute perforation, that could become a larger perforation
in due course.

Just a thought.

Mike
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IC Power / Re: Dark Oil from exhaust pipe
« Last Post by Mike Wood on Yesterday at 06:44:32 PM »
Quick question ... what plug are you running?

Mike
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IC Power / Re: Dark Oil from exhaust pipe
« Last Post by Stuart Mellor on Yesterday at 06:06:38 PM »


Hi Mike, An I.C. question! Luv it!
It looks like the long exhaust is causing the effect you describe. Have come across this in the past  - but mainly with 2 strokes. It appears to mainly effect aluminium exhausts. The longer the exhaust  - the more the 'residue' turns black - either due to heat ( of the exhaust - not the engine) or a reaction with the aluminium.
Also gets blacker with more nitro I found & depends on the type of oil.
Assuming the exhaust is the correct one for the engine? & not causing undue backpressure? Rpm should be roughly the same on either exhaust.

Given the above, if the engine runs Ok at the 'proper' rpm on a suitable exhaust, I wouldn't worry about it. When you install a shorter exhaust, the oil has less time to burn/react & therefore appears cleaner. You could try more oil - if but your engine sound healthy.....

As you say - in the recent hot weather all engines run hotter anyway...

ps - have watched CPLR set his needle on his YS - by observing the smoke colour. You only have a few seconds to do this before the engine becomes heat-soaked & the settings alter. If I remember correctly! - very white smoke means the oil is burning & needs richening. 'Normal' white smoke is OK. More white smoke than normal means too rich. Good luck.
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IC Power / Re: Dark Oil from exhaust pipe
« Last Post by Ashley Hoyland on Yesterday at 04:37:48 PM »

Hi Mike


Just going on general experience I would say the pipe is too short ......… or the engine does not 'like' the pipe.


Some years ago this happened with the ED cranked pipe on a Redshift and we never really found the answer apart from never recommending a cranked pipe for that engine.


I realise you are not using a cranked pipe and hope it is the former.


Kind regards


Ashley

PS Looks a beautiful model.
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IC Power / Dark Oil from exhaust pipe
« Last Post by Mike Watters on Yesterday at 03:55:18 PM »
Hi, wondering if someone might be able to help.

I've been running a new YS70FZ in a pattern model, which has run approximately 3/4 gallon of Model Technics YS20/20 fuel.
 
I'm using a Hatori 577 flexible header with a Hatori 530 tuned muffler (looks more like a tuned pipe)
The engine appears to runs well, I'm getting 10300-2100 rpm on a APC 12x8" prop.

Here's the problem, I see a nice trail of white smoke through the running of the engine, however, the oil is a very dark brown /black look instead of a nice light oil colour my other YS Engines. Also, the engine and pipe are very hot, (in the recent hot weather, the engine appeared to suffer in top end performance, even with no cowling on.)

 As a test, I ran the engine with the standard exhaust, the engine needed to be run a bit leaner, but the oil colour was a nice clean colour.
 Back to the pipe setup, a the engine needs richening and back to the black oil.

 Is the flexi header too long ? Causing burnt exhaust gasses to come back into the pipe, causing the oil to burn?

 Thanks Mike.
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