[urq] Re: Bosch spark plug deciphering

[Jim Haseltine]

----- Original Message -----
From: "Ti Kan" <ti at amb.org>

> Brady Moffatt writes:
> > Is a 7 a hotter plugs than a 6 in Bosch-speak?
>
> Yes.  The Bosch WR7DS for example, is a hotter plug than the WR6DS.
> BTW, Audi specifies a "6" plug for the UrQ 10VT but a "7" for all
> the type 44 10VT engines.  I wonder why the UrQ needs to run a colder
> plug than the type 44?

My docs say WR5DS for early WR engines (1981 model year) then W4DPO for
later WR engines (can't find the break but they are listed in the 86
handbook) and W7DTC for the MB engine.

ISTR that the RR 20v uses a 7 plug too but the KW runs something really
weird like a 3 or a 2.

Regards,

Jim Haseltine