I picked up a set of both the B7ES and the BP7ES NGK plugs today. Naturally, the auto parts store didn't even know what plug indexing washers are. Thanks to google, I found an overpriced set on Amazon, thence armed with a part number, I found a selection on eBay.
Here's the question: the flat copper ones seem to come in two flavors, either all .012" OR as 10 each of sizes .043", .054" and .064". The guy with the .012s claims one washer equals about 1/4 turn on the plug. If that's true, then wouldn't the others be too thick? If you've done this trick before, which set do I want? Stevan Thomas 73 Berlina In a message dated 4/30/2010 10:37:03 PM Pacific Daylight Time, [email protected] writes: > Date: Fri, 30 Apr 2010 10:16:49 +1200 > From: Les Singh <[email protected]> > Subject: [alfa] RE: alfa-digest V10 #2256 > > Date: Wed, 28 Apr 2010 21:25:13 EDT > From: [email protected] > Subject: Re: [alfa] My GTV-6 has developed a "miss"/irridium spark plugs > > Hi Ken, > I've recently been running Bosch platinum single electrode plugs in the > Berlina and they don't seem to last all that long. I have some 4 electrode > > plugs I'm going to try next. Would you mind providing heat range/part > numbers > for the two iridium plugs? Is there a Denso or an NGK iridium that works > in > a > 2 liter quattro banger? I'm also intrested in the plugs for a 6. > Stevan Thomas > 73 Berlina Veloce > 84 GTV6 > > Stevan > If can butt in here : Can't help with the GTV6 but for the Berlina the > NGK > B7ES is the correct plug and lasts way better than any Bosch plug I've > tried. I used Bosch in various engine and the only one I kept using them > in > was the Formula Ford but we changed to new ones for qualifying and the > races > - - expensive because these were the special competition types with small > hex > and special electrodes and cost heaps. > > NGK BP7ES may give you better running and performance than the B7ES. It's > the projected nose type but for use in 2 litre Alfa engines, each plug > will > need to be indexed by marking the position of the ground electrode on the > porcelain or body of the plug, then ensuring that the electrode ends up > between the valves when the plug is installed. If this isn't done, you may > hear the clicking sound of a valve (intake more often than exhaust) > contacting the electrode. If you get fouling for any reason (state of the > engine, tune etc) go to the hotter B6ES or BP6ES but these are definitely > not suitable for high rpm use. > > Les > Back from La Bella Italia.. and yes, I visited the Alfa Museum! -- to be removed from alfa, see http://www.digest.net/bin/digest-subs.cgi or email "unsubscribe alfa" to [email protected]
