Pinging or knocking or detonation is basically the ignition of fuel before
or after it's supposed to be ignited. What you actually hear is the
explosion (fuel ignition) of the fuel against the top of the piston. If
things are working as intended the explosion occurs just as the piston
reaches the top of the stroke and is starting to head back down. The
explosion then pushes down on the piston. This is the basic theory behind
how your engine works. When things happen at the wrong time the explosion,
instead of pushing down on the piston, actually hammers the piston while
it's traveling upward. Now you know why it's so hard on the engine when
you're pinging. If your ears were inside the engine you'd be able to hear
how hard the knock is.
Ron
00 PB SLT QC 4X2 5.9 46RE 3.92 LSD
For modifications see my DML Profile (URL follows)
http://www.twistedbits.net/WWWProfile/dakota/Kw9pV1EkFeOYY
-----Original Message-----
From: owner-dakota-truck@buffnet.net
[mailto:owner-dakota-truck@buffnet.net]On Behalf Of Punch
Sent: Tuesday, October 23, 2001 5:03 PM
To: dakota-truck@buffnet.net
Subject: DML: what is pinging/knocking?
hmm, wondering what causes pinging?
what causes knocking?
what is the difference between the two, and what exactly do they sound
like????
my truck makes some strange noises while idling, coming from engine
compartment! sounds like stuff clicking on and off, also rpm gauge goes
1000-1200, would this be considered rough idle, and is it set too high?
Punch
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1998 Dakota CC V6, Deep Amethyst, K&N Homebrew Intake,
Gutter Guard Grills, Dynomax Cat Back Exhaust,
Autolite 3923's.
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*In the near future: jet stage 2, billet TB, 180Dg. Thermo, energy
suspension bushings,
hotchkis sway bars.
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