Sytytystulpat!?

Tällainen vastaus löytyi yahoon 2CV-L-listalta.

“P” tarkoittaa, että elektrodi työntyy pitemmälle palotilaan. Kirjoittaja suosittelee vanhempiin koneisiin BP6HS ja uudempiin B6HS tai B7HS, sillä P-tulpat kuluvat nopeammin ja saattavat aiheuttaa nakutusta.

Aiheesta on siellä keskusteltu useampaan kertaan, joten tietoa kyllä löytyy kun hakee vanhoista keskusteluista.

From: Pete.Smay@…
Date: Mon May 16, 2005 11:33 pm
Subject: RE: [2CV-L] Digest Number 3457

In NGK lingo, “P” (projected/protruding electrode) type plugs were specified for the earlier cars, staying cleaner with less fouling in the richer
mixture/cooler combustion/lower rpm/lower compression motors. So for these earlier motors (425 & 602 up through around 1968 & characterized without heat exchanger manifolds) use NGK BP6HS or equivalent.

Non-projected/cooler electrode plugs were original equipment in the later
cars with leaner mixture/hotter combustion/higher rpm/higher compression motors. As Stan stated previously, NGK uses a reverse scale for their heat range (a “6” plug is hotter than a “7” plug). I find that under most conditions, a “7” heat range works best, but a “6” can be used if the engine tends to foul plugs or the car is operated in colder climates. So for the later generation motors (435 & 602 beginning around 1969 and characterized with heat exchanger manifolds etc.) use NGK B7HS or equivalent.

Using a hotter and/or projected electrode plug in the later motors (example: BP6HS, BP5HS) will result in much faster electrode erosion and possibly contribute more tendency towards pre-ignition (pinking).