I have a big valve head, so I have to index if I use the extended nose plugs. One of the things I've heard mentioned, is that indexing allows you to orient the electrode/gap so as to allow the best combustion. Agreeing that the orientation should be 180 dgrees off the oversize intake valve, left to my own devices, I would tend to put the open space toward the center of the combustion chamber. Does that make sense? Stevan Thomas 73 Berlina
In a message dated 7/12/2010 5:31:44 AM Pacific Daylight Time, [email protected] writes: > Performance aside, the only time I've ever had to bother with plug > indexing > is on my big valve head Spider, where I have to orient the single > electrode > plugs fore/aft to keep them from being hit by the valves. > > Ken, your story is an interesting one, I doubt you could find two people > who > would agree on the best way to orient plugs, and I wouldn't want to put a > lot of effort into orienting them one way just to find out years later > that > the best orientation was 180 degrees off.. > > bs > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On Behalf Of > KStevenson > Sent: Monday, July 12, 2010 7:34 AM > To: [email protected]; [email protected] > Subject: [alfa] Re: Spark plug indexing washers, how thick? > > My original understanding of indexing was based upon consistently pointing > the gap toward the intake valve. I think I tried it once with trial and > error on enough plugs to find a set that lined up the same. > > Years later, I took a private tour of Warren Johnson's pro stock racing > trailer with their main sponsor. I got into a plug indexing discussion. > The > WJ indexing method was to point the gap away from the intake valve. The > objective was to minimize the chance of debris finding its way into the > plug > gap. > > Ken Stevenson > Dallas, Texas > -- > to be removed from alfa, see http://www.digest.net/bin/digest-subs.cgi > or email "unsubscribe alfa" to [email protected] -- to be removed from alfa, see http://www.digest.net/bin/digest-subs.cgi or email "unsubscribe alfa" to [email protected]
