I've had a strange history with these... when they first came out, they solved
all of the drivability problems in my 1275 Midget (high compression,
over-carbed, open exhaust)... never fouled, ran great, lasted forever.
Put them in a Chrysler 2.5; they were burnt up in 8,000 miles. The trash
Champion's before them lasted 30,000.
To this day, I cannot get my Corvair 140 to even idle smoothly on Platinums.
Change nothing but the plugs and it's a different car. Tried several brands...
finally settled on Bosch Copper. Ditto for my TR6. (NGK's a close 2nd)
Finally, I bought an Audi Quattro Turbo Coupe (street version of the Group A
ralley car) which had just been tuned up by an Audi dealership. Ran great, but
surged under boost. Drove it for 8,000 miles; it suddenly started "bucking"
under boost; cutting out, missing, etc. I pulled the plugs: Bosch Platinums.
Only 8,000 miles old, the electrodes were burnt into the insulators... one
insulator was badly cracked! Called an Audi specialist (non-dealer) who said
the turbo's wouldn't run on platinums... he recommended Bosch tri-electrodes.
They completely transformed the car...smooth and much more powerful, no
surging... and 10% better mileage.
My point: I've had better luck NOT using platinums. If you think your car runs
fine on them, why not invest $10 and fit a set of Bosch Supers (copper) in the
same heat range and see if there's a difference?
Bill Elliott
Lake Mills, WI
66 Corsa (Bosch Copper)
67 Dart GT (Bosch Copper)
71 TR6 (Bosch Copper)
75 300D (N/A)
85 UrQ (Bosch Tri-electrodes)
89 SAAB 900T (just bought, haven't checked yet)
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