I've never heard anyone mention exhaust flow pressure or volume
affecting pinging (pre-ignition). It very well might be, but I've
never heard of it. I'm just shooting in the dark here, but maybe it's
the fact that the combustion chambers/heads/exhaust system heat up a
lot faster than the coolant - therefore, the pinging when the temp
gauge is still "cold". Just a blind guess.
Tate
-----Original Message-----
From: fawcett@uism.bu.edu [SMTP:fawcett@uism.bu.edu]
Sent: Wednesday, October 07, 1998 12:51 PM
To: dakota-truck@buffnet.net
Subject: Re: DML: RE: No More Ping After Headers
Thanks Tate. I think you and Jon had mentioned the heat angle
before... The
thing is, it used to ping when the engine was cold too. It pinged
after I put a
180 T-stat in as well...
Anyway, if I read you right, exhaust back pressure and flow rates
don't have
anything to do with engine ping, correct?
T.
______________________________ Reply Separator
_________________________________
Subject: DML: RE: No More Ping After Headers
Author: <dakota-truck@buffnet.net> at smtpout
Date: 10/7/98 8:55 AM
Your engine is running cooler - better heat dissipation. Voila - no
more ping!
Actually, the Magnum manifolds flow very well.....for manifolds.
Replace that god-awful y pipe and you'll probably see even a bigger
difference in performance. Unless you got MP or Thorley headers -
then you already did it - haha!!
Tate
-----Original Message-----
From: fawcett@uism.bu.edu [SMTP:fawcett@uism.bu.edu]
Sent: Wednesday, October 07, 1998 7:53 AM
To: DAKOTA-TRUCK@buffnet.net
Subject: DML: No More Ping After Headers
I was talking to a mechanic friend of mine yesterday and I told him
how I
had a slight amount of engine knock or ping before I installed
headers.
Now that they are installed there is not even a hint of ping anywhere
in
the RPM range under any load condition with a hot or cold engine and I
still use the cheapo 87 octane gas....
He thought the stock manifolds may have been causing an excessive
amount of
back pressure and that might be what was making the engine ping a
little
bit... Does this make sense to the pros out there??
I'm happy as a clam that the ping is gone --Just still curious as to
why
it's gone.
Thanks.
T.
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