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Black oil from Hatori tuned muffler

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Old 08-18-2018, 02:53 AM
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Default Black oil from Hatori tuned muffler

Hi, wondering if someone might be able to help.
I've been running a new YS70FZ in a pattern model.
The YS70FZ is using a Hatori 577 flexible header with a Hatori 530 tuned muffler (looks more like a tuned pipe)
The engine runs well, I'm getting 10300-2100 rpm on a APC 12x8" prop using Model Technics YS20/20 fuel.

Here's the problem I see lots 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 are

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?

BTW, I'm running the long pipe setup as it suits the old style pattern model I'm flying also it's a very quiet set up.

Thanks Mike.
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Old 10-08-2018, 11:58 PM
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Problem sorted.. As this was a new YS70FZ I was using, the Hatori pipe and header had been used for quite along time in another model.
The problem was due to coking up in the pipe, causing some restrictions of the exhausts gases. This caused the residue oil in the pipe to cook turning the oil black.
Pipe was cleaned up with neat thinners and the problem went away.
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Old 10-26-2018, 10:42 AM
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I have three 530 pipes. I have long since stopped using the flex header. If you need one I have a new one. This is a very quiet pipe. It was designed for the 53. The 70 is getting a bit large for it. It does not run well on the 80. I have switched to the 720 pipe and the YS header.

http://www.yspower.co.jp/en/engine/acce.html

The 80 is a beast. The 725 still a few at Central Hobbies would work as well.

Last edited by Four Stroker; 10-26-2018 at 10:48 AM.
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Old 10-31-2018, 05:07 AM
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Four Stroker, thanks for your reply. This backs up what another flyers thoughts were, that the YS70FZ is on the limits for the Hatori 530 pipe.

I've since replaced the pipe with a Hatori 720 short cooling muffler and ridged headed, as its less restrictive.

This could also solve the problems I was experiencing with the engine over heating in vert warm weather, despite there being more than ample cooling in the cowling.

Regards Mike.
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