thanks, matt.
> -----Original Message-----
> From: Barret, Matt [SMTP:MATT_BARRET@EARTHTECH.COM]
> Sent: Thursday, August 19, 1999 3:41 PM
> To: 'dakota-truck@buffnet.net'
> Subject: DML: RE:DETONATION
>
> JAY, HERE YA GO!
>
> Detonation Insights
> By Rod Machado
>
>
>
> The cylinder's fuel-air charge expands as it's ignited by the sparkplugs.
> Properly done, this isn't an explosion so much as it is a smooth,
> progressive burning of the combustible gases within the cylinder. As these
> gases expand, they increase pressure, pushing the piston downward during
> its
> power stroke.
>
> Detonation occurs when the fuel-air charge explodes, burning in a short,
> fierce burst of energy rather than a controlled, even burn. Such an
> explosion can be very damaging and sometimes fatal to the engine.
> Detonation
> occurs after the sparkplug fires, when the unburned portion of the
> fuel-air
> charge, ahead of the burning charge, suddenly explodes. High engine and
> cylinder head temperatures increase the likelihood of detonation. They may
> aid in the abnormal exploding vs. the normal burning of the ignitable
> gases
> within the cylinder.
> With the exploding of the cylinder's fuel-air charge, combustion takes
> place
> earlier. This suddenly and dramatically releases the heat from the
> combustion process to the cylinder, piston and valves (too much heat at
> one
> time-that's the problem). The exhaust gases that are released have already
> expended their heat.
>
> The following are several known causes of detonation:
>
> 1. Using a lower grade of fuel than what is recommended by the
> manufacturer.
> Higher octane fuels have additives which help prevent detonation.
>
> 2. Over-leaning. Excessive leaning can raise cylinder head temperatures,
> increasing the likelihood of fuel exploding instead of burning within the
> cylinders.
>
> 3.Overheating an engine by climbing too steeply on hot days.
>
> 4. An abrupt opening of the throttle.
>
> MATT
>
> -----Original Message-----
> From: Mooberry, J [mailto:j.mooberry@lmco.com]
> Sent: Thursday, August 19, 1999 2:13 PM
> To: 'dakota-truck@buffnet.net'
> Subject: RE: DML: RE: Turning over 5500 rpm's, unbelievable
>
>
> <<on that note could somebody tell me exactly what detonation is? thx.
> -jay<<
>
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