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Old 07-31-2009, 10:45 AM   #1
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Newbie question

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I have been flying planes both nitro and electric, to turn off a plane (nitro) you close the carb, on a buggy this is not possible, my friend says to cover the exhaust but to me this floods out the engine and seems to make it harder to start the next time, i say pinch the line but he says its bad for it to run lean like that for those 3 seconds...anways i disegree and was wondering everyone else's thoughts?
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Old 07-31-2009, 10:52 AM   #2
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Re: Newbie question

i always pinch, unless i can't get to the line easy enough, then i plug the exhaust.... never given me any problems... so pinch away imo.....
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Old 07-31-2009, 11:21 AM   #3
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Re: Newbie question

On alot of Cars and trucks there is a part of the fly wheel that pokes out the bottom so you can use a starter box. I put my shoe on it and gently put pressure on it, that will stall it. I usually use plug the exaust, never have i had issues starting the truck afterwards.
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Old 08-01-2009, 07:38 AM   #4
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Re: Newbie question

With alcohol fueled engines, as we use in planes, it's important to run out the fuel at the end of the day.

The best way to do this is to pull off or pinch the fuel line while the engine is running at speed and is hot. If it's cold or at idle, you will leave a lot of fuel behind.

Following the running out of fuel, it's a good idea to put some after run oil (automobile automoatic transmission fluid works fine) into the engine and circulate it over the moving parts by cranking over the engine a few times, just as you do when you start it up - without the glow plug connected.

Once you've run out the fuel, before adding the ATF, you will find that you can get the engine to run for a couple of seconds with the fuel line disconnected because of the remaining smalll amount of residual fuel in the crankcase. There's lots of oil there too.

What you are trying to do is purge the engine of any unspent fuel and the exhaust gases and contaminants from combustion. The residual alcohol adsorbs moisture. With that in your engine, the result is the formation of nitric acid which destroys the internals, especially the bearings. You can also get rust on the bearings, crankshaft and any ferrous parts.

You do your engine more harm by not running it out before storage than you do by pinching off the fuel line while it is running. It stops running long before there is any damage from a lean run.

If you ever get the chance, open up the engine - remove the backplate - one day after running without running it dry. You'll be amazed how much unspent fuel there is in the crancase. You'll also smell some exhaust. That's all bad if you intend it to have a long, healthy life.

While you are at it, why not ask this guy who gave you the advice about lean running while pinching off the fuel line where his info comes from? Is there any real evidence? Is it just speculation? Is it just a case of what someon thinks is logical? My comments come from known, demonstrated results and facts - this is what you actually find. And it's backed up by people who know, design, test and run engines, such as Clarence Lee.
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