Spark plugs for 6C 2500SS - Alfa Romeo Bulletin Board & Forums
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post #1 of 3 (permalink) Old 01-11-2019, 03:51 PM Thread Starter
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Spark plugs for 6C 2500SS

The Alfa owner's manual lists Champion R-17 spark plugs for the 6C 2500SS engine. My engine has a set installed. I am looking for some more of these in case I need them. Apparently they are not common and I cannot find any interchange to another spark plug. These spark plugs are 18mm thread with a 3/4 inch reach. The electrodes are recessed.

Does anyone have different spark plug in their engine? What are you using?
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post #2 of 3 (permalink) Old 01-12-2019, 01:25 PM
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R 17 will be difficult>impossible to find, methinks.
Perhaps ebay, if you just search vintage champion spark plugs, maybe someone hasn't bothered to note the numbers, just selling a box of vintage plugs....etc

the NGK classic catalogue list AB 7 for the 6C2500 with a gap of 0.020", but doesn't differentiate between 2500 and super sport (originally R-16 and R-17)
the NGK AB 6 is what afra in Italy sells for the 6C 2500.

Green spark plug company (UK) has the AB 6 and AB 7 for about quarter the price of italy.

But none really look like the R17

Dom - Alfa Spider 1990 S4 - formerly: Alfa 101 Sprint, 2600 Sprint, Montreal - family classics: Jensen Interceptor II, '58 Hooper RR Silver Cloud I, Shadow II, '60 Corvette.
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post #3 of 3 (permalink) Old 05-04-2019, 08:33 PM
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here's your chance to buy a box of ten R17's:
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