RCU Forums - engine burnout ?

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wings_of_fire

12-23-2007 07:13 AM

engine burnout ?

.what does the term `engine burnout ` mean in rc world ?.. what exactly happens to the engine ?.

thnx a lot in advance ..:D

321	12-23-2007 08:20 AM

RE: engine burnout ?

When the engine suddenly quits, it is referred to as a flameout by most RC heli pilots over here in my part of the world. Are we talking about the same thing? If so, it can be caused by engine air leaks, lean mixture settings, a bad glowplug (which can be caused be either of the former), poor engine cooling, and bad fuel. If one of these factors makes the engine overheat, it can tighten up and/or lose proper combustion timing and quit.

wings_of_fire

12-23-2007 06:40 PM

RE: engine burnout ?

Quote:

ORIGINAL: 321

When the engine suddenly quits, it is referred to as a flameout by most RC heli pilots over here in my part of the world. Are we talking about the same thing? If so, it can be caused by engine air leaks, lean mixture settings, a bad glowplug (which can be caused be either of the former), poor engine cooling, and bad fuel. If one of these factors makes the engine overheat, it can tighten up and/or lose proper combustion timing and quit.

I had gone through a post where a guy described his helicopter accident & said after the impact the engine ran freely without powering anything which increased the RPM leading it to burnout. It was run on Nitro. Does that mean that the piston rings & sleeve wear out due to high RPM which leads to low compression or may be damaging the sleeve or piston ?

321	12-24-2007 03:37 PM

RE: engine burnout ?

Quote:

Does that mean that the piston rings & sleeve wear out due to high RPM which leads to low compression or may be damaging the sleeve or piston ?

Yes, once the engine overrevs it can be damaged in a number of areas and ways, including scoring of the piston/ring & sleeve. Once these are damaged, compression is lost and you could say the engine is burned out, burned up, blown, cooked, etc. [:o] It's generally not worth replacing these parts due to their cost being a large fraction of that of a new engine, not to mention other possible damage (like bearings).

wings_of_fire

12-24-2007 06:31 PM

RE: engine burnout ?

[quote]ORIGINAL: 321

Quote:

Yes, once the engine overrevs it can be damaged in a number of areas and ways, including scoring of the piston/ring & sleeve.

all this happens in a couple of seconds ?

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