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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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