pining,twin plugging,etc...

[Matthew B. Watts]

-----Original Message-----
From: jb24 at chrysler.com <jb24 at chrysler.com>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
Date: Tuesday, March 10, 1998 12:50 PM
Subject: Re: pining,twin plugging,etc...


>I have been reading an excellent book I got while at the SAE
>International Congress up here in Detroit two weeks ago called Advanced
>Engine Technology, by Heinz Heisler (published by SAE @ www.sae.org for
>approx. $35).  Just so happens I was reading last night about multiple
>valves and spark plugs.  Twin plugs reduce spark advance simply by
>cutting the distance the flame front has to travel to get combustion
>done around TDC.  Because the burn happens faster, greater peak
>pressure and voila, more power.  Lots of other really great stuff in
>this book, with graphs and pictures, etc.  More info for power-crazed
>motorheads than I have found in any one place prior.
>
>John Bucknell is jb24 at chrsyler.com


I also heard that having dual plugs helps to avoid misfires since the
fuel mixture isn't perfectly homogeneous.  The thought here is that
you cut in half the chances that two places in the cylinder head have
a poor enough mix next to the plug that they won't ignite.  Misfires
not only get the anti-smoggers uptight while killing power output, but
tends to mess up the dynamic parameters in the fuel injection system
as well.  Not sure this is the greatest backup strategy if the computer
is counting on a fast burn though.

Matt