"Let the piston meltdowns and broken rings begin."

Dennis, who's had that happen to them?

--
Jack "Rocket j Squirrel" Elliott
1984 Westfalia, auto trans,
Bend, Ore.

On 08/21/2012 04:28 PM, Dennis Haynes wrote:
> Those are simply the wrong spark plugs. The standard plug is a W7C. The "D"
> is a longer reach plug used in the inline 4s. The projected tip brings the
> flame front closer to the piston and can increase the propensity for knock
> and ping. This can also increase the production of NOx especially once ping
> begins. Unfortunately in the Water boxer Ping is not heard until it is
> getting really bad. Let the piston meltdowns and broken rings begin. Yes it
> may feel better especially after replacing worn plugs. If you want to use
> quad electrode plugs go for the Bosch 4477 ( my favorite). Although it is
> listed as a replacement for the W7D's due to its more universal design the
> actual reach is closer to the "C" series and the platinum tip being enclosed
> eliminates the glowing red part that can induce ping. BTW back in the old
> days if you went to the dealer to get spark plugs you would get W7CS.
> W=14mm thread with gasket
> 7=Heat range Higher is hotter.
> C=length of thread and reach, (d=extended tip)
> Next C =copper, S=Silver
> If an "X" = extended gap such as .060.
>
> The new Bosch numbering system is not as easy to decipher.
>
> Dennis
>
>
>
> -----Original Message-----
> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
> Rocket J Squirrel
> Sent: Tuesday, August 21, 2012 4:24 PM
> To: vanagon@GERRY.VANAGON.COM
> Subject: New-Spark-Plugcebo Effect
>
> Just swapped out my older Bosch W7DC0 pluggies for new NGK BP6ET.
>
> Either tencentlife (Chris Corkin) is right: "The main reason this plug
> design so often produces palpable improvement in idle, throttle response,
> and overall performance is mostly due to the projected core, and that is
> helped by the side electrodes not "shading" the spark gap from the middle of
> the charge. The wbx has a very compact, somewhat "spherical" charge at TDC,
> as well as outstanding squish dynamics, so initiating flame nearer to the
> charge center aided by the squish produces a faster total burn, and fast
> burn is the principal requirement for responsiveness, efficient use of the
> fuel, and lowered emissions (especially NOx)."
>
> <http://www.thesamba.com/vw/forum/viewtopic.php?t=327351&start=80&sid=2b4a44
> c5892001fb15120a77e2dd8767>
>
> or it's the New-Spark-Plugcebo Effect.
>
> But I definitely feel that the throttle is more responsive and the van
> peppier.
>
> No increase in real power, of course: took the van up my neighborhood
> calibrated steep street and it didn't climb any faster. But I'm pleased
> anyway.
>
> --
> Jack "Rocket j Squirrel" Elliott
> 1984 Westfalia, auto trans,
> Bend, Ore.
>