Chevron Techron

·         John Austin

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I run 93UL/no ethanol mogas in my 3300 (430 hrs). Occasionally, it will diesel or run-on for a few seconds after shut-down. I've found that if I let the engine idle for a few minutes prior to shut-down it will rarely diesel. I assume the dieseling is due to hot carbon deposits. My plugs, however, looked good at the last inspection.

I can manage the dieseling pretty good by idling the engine, but I'm concerned that if excessive carbon is present, this could lead to valve or ring damage! Would it be advisable to use a fuel system cleaner such as Chevron Techron ( a fuel detergent based on PEA, polyeter amine) to clean up some of the carbon? If so, what concentration to use and how frequently to use it?

Thanks,
John
N750A

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John
N750A
Zenith STOL CH750, Jabiru 3300

·         Doug Smith

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Hi John,
That's a little unusual... though they will sometimes do that if you cut the ignition while the rpm is above idle. Most times when I've flown with a 3300 i have enough of a taxi (at idle) and I've never had one run on after cutting the ignition. Do you have a short taxi? Or do you have to use a bit of power at taxi?
If you're using mogas I'd be surprised if there was much in the way of deposits, wouldn't think there would be a lot of value trying a chamber cleaner.
Regards,
Doug

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·         John Austin

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As I'm operating mostly on turf runways, I do use a bit of power to taxi, but the taxi distance is fairly short. It might not be of much value to try the cleaner, but would there be any potential harm?

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John
N750A
Zenith STOL CH750, Jabiru 3300

·         Doug Smith

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Hi John,
I've not used it and am not sure whats in it, plus it depends on your fuel system: any idea if your tanks, lines etc are alcohol safe?
Unfortunately, with products like this there is some potential for harm (via detonation or chemical attack to components) so you have to do your homework
I'd suggest having a really good read of the products fine print. See if it says anything about what it does to the octane rating of the fuel, if there are any plastics, composites or metals it says not to use it with... maybe give the local supplier a call. all things being equal there probably won't be an issue but you don't want to jump in blind.
Regards,
Doug.