I was wondering when people say ....turbo detination ...what do they mean by this? Whats happening to the turbo or motor in DETINATION?
thnks
i know its prolly a dumb question but o well

 

Not a dumb question, but it has nothing to do with a turbo. Any engine, NA, Supercharged, or turbo can be affected by it.

Detonation, or pre-ignition is when fuel explodes in the cylinder before it's supposed to because of a hot spot, too far advanced timing, incorrect spark plugs, or fueling problems.

Basically, there is an explosion in there which is bad, because instead of making usable energy, you are just blowing gasoline up, which puts alot of stress on your pistons and rods.

It sounds like shaking marbles in a coffee can - if you've ever driven a car that has had trouble going up a hill and making that marbles noise, it's detonating.

Detonation will kill your car FAST - and, sometimes you cannot hear it. The easiest way to check what kind of shape the engine is in is to pull the plugs and make sure that they are not "burned" (go to http://www.ngksparkplugs.com for info).

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 96IntegraRS &raquo;</TD></TR><TR><TD CLASS="quote">Basically, there is an explosion in there which is bad, because instead of making usable energy, you are just blowing gasoline up, which puts alot of stress on your pistons and rods.
</TD></TR></TABLE>

Theres always an explosion, but in this case its an improperly timed explosion.
Usually occurring while the piston is still making its way up, it forces the engine to
fight past the combustion pressure in order to reach top dead center and THEN
continue on its power stroke.

 

Thanks for the clarification - I figured by using the word "Bad" that it would handle the job

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boostdB16a &raquo;</TD></TR><TR><TD CLASS="quote">I was wondering when people say ....turbo detination ...what do they mean by this? Whats happening to the motor in DETINATION?</TD></TR></TABLE>
Isn't that how deisel engines work? Just kidding.
Another way to say it is: Cumbustion by compression, alone. Or, without spark present.
In a diesel, detonation = good
In a gasoline engine, detonation = bad
Just my 02 cents

 

Detonation and pre-ignition are two different events.But both are similar and can either way damage your engine.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by aeolus &raquo;</TD></TR><TR><TD CLASS="quote">Detonation and pre-ignition are two different events.But both are similar and can either way damage your engine.</TD></TR></TABLE>
I didnt know that.
In what way are they different?

 

Taken from NGK's website:

Types of Abnormal Combustion

Pre-ignition

Defined as: ignition of the air/fuel mixture before the pre-set ignition timing mark
Caused by hot spots in the combustion chamber...can be caused
(or amplified) by over advanced timing, too hot a spark plug, low octane fuel, lean air/fuel mixture, too high compression, or insufficient engine cooling
A change to a higher octane fuel, a colder plug, richer fuel mixture,
or lower compression may be in order
You may also need to retard ignition timing, and check vehicle's cooling system
Pre-ignition usually leads to detonation; pre-ignition an detonation are two separate events

Detonation

The spark plug's worst enemy! (Besides fouling)
Can break insulators or break off ground electrodes
Pre-ignition most often leads to detonation
Plug tip temperatures can spike to over 3000°F during the combustion process (in a racing engine)
Most frequently caused by hot spots in the combustion chamber.
Hot spots will allow the air/fuel mixture to pre-ignite. As the piston is being forced upward by mechanical action of the connecting rod, the pre-ignited explosion will try to force the piston downward. If the piston can't go up (because of the force of the premature explosion) and it can't go down (because of the upward mo-tion of the connecting rod), the piston will rattle from side to side. The resulting shock wave causes an audible pinging sound. This is detonation.
Most of the damage than an engine sustains when "detonating" is from excessive heat
The spark plug is damaged by both the elevated temperatures and the accompanying shock wave, or concussion

 

Good info 96integrars.
See that's why I"M here, to learn something I didn't know before.
Thanks.

 

Another explanation...

Combustion is supposed to start at the spark plug, then a flame-front travels from there outwards across the combustion chamber. The flame-front travels at subsonic speeds, while the piston begins to move downwards.

Auto-ignition is when there's hot spots that ignite themselves before the flame-front gets there. Like carbon deposits on the head or piston. Pre-ignition is when this happens before the spark.

Auto-ignition can also happen after the spark, that's called post-ignition. What happens... as the flame-front is traveling across the combustion chamber, the farthest corners (still unburned) see increasing pressure & temperature even as the piston moves down. They ignite themselves before the flame-front gets there.

Detonation is when the flame-front travels at supersonic speeds. Shock waves & stuff like that aren't good. But there's some disagreement about whether that actually happens in an engine.