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Author Topic: Rotor Arm  (Read 849 times)
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Hero Member
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United Kingdom United Kingdom

Posts: 923

« on: March 07, 2024, 07:16:26 PM »

1983 HPE carb, electronic ignition, matching a 79-81 model

As mentioned in the members section, I identified a faulty rotor arm [open circuit] in
my Bosch (non-vac advance) distributor
that put me in a layby to await a tow truck. [ engine splutterd and stopped]

With Peter's help, and research I found that it's extremely likely I needed
a 5k ohm equipped rotor. I ordered an Beru EVL029.

In the meantime, A local motor factor identified a Bosch equivalent which I bought.
Upon testing the Bosch, it's reading 1k ohms. I then received the Beru item
and that reads 5k ohms.

The 1k works but i'm still not 100% sure.

So, does anyone have a definitive figure published anywhere? Neither Haynes nor my later
Lancia info sheets have it stated.

I also don't know the effect if the wrong one is fitted long term.


1984 2.0 Carb HPE [ex Aus] Grigio Finanza.
2007 Mazda 6 2.3 [current daily, highly recommended]
The past:
1980 2.0 HPE White in South Africa [hope it survives!]
1976 1.6 Coupe Lancia Blu [PFG 76R] [probably deceased]
oh,and an Uno Turbo 1997 also in SA [stolen,never recovered]
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United Kingdom United Kingdom

Posts: 1347

Graham Stewart

« Reply #1 on: March 07, 2024, 07:34:28 PM »

I'm a self-confessed electric/electronic dunce, but isnt the resistance in the rotor arm there to suppress interference in TVs, radios and other electronic devices? If so, I'd suspect the 1k ohm part is an earlier one and the 5k ohm part is a later, more stringently specified, part.

I may of course be completely and utterly wrong on this...

1980 Lancia Beta Spider 2000 (S2FL)
2002 VW Transporter T4
2017 KTM Duke 690R
2008 Aprilia SL1000 Falco
1992 Ducati 888 SP3
1988 Honda VFR750F
1980 Yamaha RD350LC
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