What does detonation look like? Click here to find out!!
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Better than steak
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What does detonation look like? Click here to find out!!
I found this and I thought I would share off my other board.
http://www.efi101.com/forum/viewtopic.php?t=131
http://www.efi101.com/forum/viewtopic.php?t=131
Smarter than you
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Re: What does detonation look like? Click here to find out!! (Arturbo)
you know when Arturbo makes a post that you wanna look. 
thanks alot for that link Art, a picture is worth a 1000 words thats all i gotta say.
thanks alot for that link Art, a picture is worth a 1000 words thats all i gotta say.
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From: Auburn, NH, USA
Re: What does detonation look like? Click here to find out!! (Arturbo)
Coolest pictures ever, damn I'm such a nerd. It's interesting to see real pictures of combustion in an engine, and detenation especially. Good link.
Jake D.
Jake D.
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. good info art, your the man.
Re: What does detonation look like? Click here to find out!! (Arturbo)
Heh. Ben talks a lot about those see-through cylinders.
BDC = Bottom Dead Center...it is after TDC.
BDC = Bottom Dead Center...it is after TDC.
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Re: What does detonation look like? Click here to find out!! (Arturbo)
awesome Art!
so let me ask you this, in the second row,second picture, we are seeing multiple hot spots in the combustion chamber at 2 degree BDC?
so let me ask you this, in the second row,second picture, we are seeing multiple hot spots in the combustion chamber at 2 degree BDC?
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Re: What does detonation look like? Click here to find out!! (FredoSP)
In those photos, "BDC" is refering to Before TOP dead center.
As far as preignition vs. detonation.... preignition is the burn starting before the spark plug fires. This will 'usually' occur when the piston near BOTTOM dead center on the intake stroke, as this is when it's easiest to light off the mixture (due to some hot spot in the chamber for example). Detonation usually happens AFTER the spark plug has already fired, but due to a host of possible variables, the burn goes uncontrolled...like the photos show.
Again....please bear in mind that the photos showing detonation are just an example of what it might look like. The photos were taken from an engine that was specifically built to promote a controlled detonation right near TDC. You can also see that it looks like the spark plug hasn't even fired when the motor detonates (like a diesel). In a more traditional detonating motor you would see something like this happening shortly after your plug fired, and this extreme pressure build up would happen even earlier during your compression stroke.
As far as preignition vs. detonation.... preignition is the burn starting before the spark plug fires. This will 'usually' occur when the piston near BOTTOM dead center on the intake stroke, as this is when it's easiest to light off the mixture (due to some hot spot in the chamber for example). Detonation usually happens AFTER the spark plug has already fired, but due to a host of possible variables, the burn goes uncontrolled...like the photos show.
Again....please bear in mind that the photos showing detonation are just an example of what it might look like. The photos were taken from an engine that was specifically built to promote a controlled detonation right near TDC. You can also see that it looks like the spark plug hasn't even fired when the motor detonates (like a diesel). In a more traditional detonating motor you would see something like this happening shortly after your plug fired, and this extreme pressure build up would happen even earlier during your compression stroke.
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Re: What does detonation look like? Click here to find out!! (ccjb100)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ccjb100 »</TD></TR><TR><TD CLASS="quote">In those photos, "BDC" is refering to Before TOP dead center.
</TD></TR></TABLE>
Yes, hence my query. At any rate, detonation and preignition are simillar with the major difference being the time in stroke at which they happen. They may be simillar, but preignition is MUCH MUCH MUCH more damaging to the engine than detonation.
Little bombs in motors = bad
Smooth controlled burn rate = good
Timing burn rate for best mechanical advantage = teh bettar
</TD></TR></TABLE>
Yes, hence my query. At any rate, detonation and preignition are simillar with the major difference being the time in stroke at which they happen. They may be simillar, but preignition is MUCH MUCH MUCH more damaging to the engine than detonation.
Little bombs in motors = bad
Smooth controlled burn rate = good
Timing burn rate for best mechanical advantage = teh bettar
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