Non rev-limiting rotor arm ?

[Lightweight_911]

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I know that the rotor arm from a Beetle, etc can be used instead of the rev-limiting version fitted as std to early 911's but can anyone tell me the Bosch part no. as there seem to be numerous models ?

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[Nine One One]

https://forums.pelicanparts.com/porsche ... or-do.html

Last night, I had put a 73.5 2.4TK rotor in as an interim measure to get the car started -- which it did. Based on everyone's input (and a search of the Pelican history on the subject) I found a rotor from a '72 Beetle (Bosch number 04038 per RoninLB) at a local NAPA parts store and bought a couple. I also ordered a couple of '78 SC rotors ( 930-602-902-00-M14 ) from our host. I put one of the 04038 rotors into the car and have kept one as a spare or for experimenting. Some observations...

1) The resistance on the 73.5 2.4TK rotor was 4.5K ohms while the resistance on the VW 04038 rotor was .4 ohms. This is similar to the resistance that I was able to measure on what's left of the destroyed rotor. So the 73.5 2.4TK rotor definitely has too much resistance.

[Lightweight_911]

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Thanks

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[Jonny Hart]

Why not just take the spring and plunger out?