This is due to the denser air. Colder air takes up less space, therefore
you get more air in the cylinder, therefore better volumetric efficiency. ie
closer to true compression ratio. It could also be "winter gas" which has a
different mix to it.
Tony
----- Original Message -----
From: "Jim Miller" <jim76712@swbell.net>
To: <dakota-truck@buffnet.net>
Sent: Sunday, November 19, 2000 10:04 PM
Subject: DML: cold weather ping
> The only time I have to switch to 89 octane is in weather below 50 degrees
to
> prevent pinging. this makes no sense to me because my truck runs colder
even
> after driving for hours. I have the 3923 plugs but stock thermostat. My
> truck does not ping much, just barely and then only sometimes under full
> throttle in the summer at 100+ degrees but in the winter it will ping at
3/4
> throttle especially at higher rpm. Any ideas? 99 R/T with 3923 plugs and
> mopar headers and stock but dealer reflashed computer.
> Jim in Waco.
>
>
>
>
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