A question about timing
 

Is it possibly to estimate what ignition timing a glow plug engine have. I suppose it is before TDC, but how much?

A question about timing
 

You can just measure it with a degree wheel, they're all different. Here's a post that talks about it:
http://www.flightlines.com/forum/For...ML/000364.html

A question about timing
 

I don't see how that can be measured. The Fuel ignites by the glow plug. but it is glowing all the time (like an old oil engine).

A question about timing
 

Hej!
Varför vill du veta det??? Kan inte förstå vad den kunskapen skulle användas till....Berätta

Hälsningar!
Jan K
Väsby MF

To the Swedish fellow!
 

Jag är en "motor man" och bara nyfiken på vilka premisser en 2-takts motor av det här slaget fungerar. En liten glödstiftare är rätt så lik en råoljemoter. Bara mindre och annat bränsle och framför allt, tändningen går inte att styra.

A question about timing
 

It's almost (but not quite) impossible to say when ignition occurs in a glow plug engine because of all the variables. However, I have a graph made up by Brett Buck from cylinder pressure readings gathered by Sott Bair in tests done on a Super Tigre 46 running in a 4 stroke at 7500rpm. The graph is actually instantaneous torque at all degrees of crank rotation but it can be interpreted as showing where ignition occurs. The graph shows a sudden rise in torque (pressure) at approximately 25 degrees BTDC.

A question about timing
 

Interesting. That appears to be realistic. It must say something about the engine or combustion chamber efficiency. Now I only have to check with other two-stroke engines.
Why, you may ask?
It can't be wrong to be curious.

A question about timing
 

But it can be lethal. :D

"nose to close to the prop"
 

The warning is apprehended :D
(did I express this right?)

A question about timing
 

Close, but not quite. Our police apprehend bad guy's. We heed warnings. :)

A question about timing
 

Damned! But apprehend has two meanings?

apprehension 1. what police do 2. light fear (sort of)?

My nose apprehend the prop.

A question about timing
 

That would be apprehensive. Such as " He was apprehensive about flying his new large scale airplane". :eek: