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Subject:Re: Bosch rotors
From:Old Volks Home
Date:Sat, 2 May 1998 14:17:26 -0700

At 02:28 PM 5/2/98 -0600, Bill wrote:
>Does anyone know if Bosch 04033 rotor supercedes 04038 rotor?
**************************************

No, as a rule, the 04033 rotor is used with Points Style Distributors and
the 04038 rotor is used with VW/Audi Hall effect Electronic Ignitions (but
not all - some require the 04170 rotor as well).  The resistance value is
different in both rotors, so it might not be a good idea to interchange
them.  Individual rotors are usually made for a specific purpose and rarely
are they superseded.  In some cases, the tracking metal piece on the end is
specifically made for an ignition's overall energy output to prevent carbon
tracking for that particular application and in some cases, better
resistance to engine room heat.

Exception however is that VW (but not Bosch) superseded the 04012 rotor to
the 04033 quite a few years ago.

My advice is to stick with what originally came with the vehicle/distributor.

Jim Thompson
84 Westy 2.1 * 62 Beetle * 90 Fox Wagon
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