M10/M20 ignition coils (help!)

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dsio
E30 Zone Newbie
E30 Zone Newbie
Posts: 239
Joined: Tue May 03, 2005 11:00 pm
Location: Brisbane Australia

Post Sat Aug 20, 2005 12:24 pm

Are these two ignition coils interchangeable?

I mean, will an M20 coil run ok in an M10 engine? They look identical, and on paper, the resistances are different, but in the same ratio.

The primary / secondary on the M20 is 0.50 ohms on the primary to 5000/6000 ohms on the secondary.

The primary / secondary on the M10 is 0.82 ohms on the primary to 8250 ohms on the secondary.

I need to know really quickly!