My experience with detonation and pre-ignition is somewhat limited, as I've
alway's
been careful to use the proper fuel and maintain proper ignition timing.
My Supercharged V6 ran into a lean out condition last year that resulted in
some popping
or mild detonation on both a dyno pull and a QTR mile pass...........
That problem was cured with a set of 24lb/hr injectors 2 days later and I
haven't had a issue
since....the Dak went 2 tenth's faster after the fix!!!!.
my current tuning issue will be cured with the APEXi Super AFC-2 in a couple
of
weeks.
Thanks for the Info Bob!!
I think that clarified things.
Ron-
----- Original Message -----
From: "Bob Mankin" <bob@coralfarms.com>
To: <dakota-truck@dakota-truck.net>
Sent: Thursday, May 29, 2003 11:14 AM
Subject: DML: RE: Re: Re: Re: Re: Superchips Dyno Results
>
>
>
> > -----Original Message-----
> > From: owner-dakota-truck@bent.twistedbits.net
> > [mailto:owner-dakota-truck@bent.twistedbits.net]On Behalf Of
> > scsilverdak
> > Sent: Thursday, May 29, 2003 7:14 AM
> > To: dakota-truck@dakota-truck.net
> > Subject: DML: Re: Re: Re: Re: Superchips Dyno Results
> >
> >
> > AND as far as the octane rating debate,
> > most chips and power adding devices such as Superchargers, and Nitrous
> > require a slightly higher octane rating of fuel to slow the
> > rate of fuel
> > burn to ward off detonation.........pinging is mild detonation or
> > pre-ignition of the fuel before it's supposed to.
> >
> > Ron-
> >
>
> FYI, pre-ignition and detonation are two different things. Detonation is
an
> uncontrolled burn of the air/fuel mix that is timed correctly but burns
> improperly, usually with an "explosion" at some point in the burn event
> which is the ping or knock you hear.
>
> Pre-ignition, OTOH, is burning of the air/fuel before it is supposed to
burn
> or earlier in the ignition cycle. This event is not always audible.
> Detonation is, generally speaking, associated with high cylinder pressures
> and pre-ignition is generally associated with high cylinder temperatures
and
> not so much pressure.
>
> Detonation will pop a head gasket. Pre-ignition can lead to extremely high
> cylinder temps and just melt stuff. Sometimes when you see someone who has
> knock the ring lands off a piston, what they probably had was detonation,
> which led to pre-ignition, which overheated the piston, thereby causing it
> to break up. It's common for folks to lump this all in the "detonation"
> catagory.
>
> Of the two events you can see which is more destructive.
>
> Bob
>
>
>
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