986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - Keep her above 4000rpm and she'll thank you for it every day.

70Sixter · 11-07-2006, 10:35 AM

It was originally mostly a spark plug fouling issue. Before CD (in 69?) fouling was a major problem. Could happen in minutes, especially in traffic. Some people even put hotter plugs in for city driving and switched to cold ones for open road/track. We all tried to use Amoco Super Premium because it was the only lead free gas.

Low rpm carbon deposits can form around the top of the cylinder and the results can be disastrous after years of build-up when a trip to redline "stretches" the rod & piston into collision with the nasty carbon.

11-07-2006, 10:35 AM	#27
70Sixter Registered User Join Date: Jun 2005 Location: Surf City, NC Posts: 1,079	It was originally mostly a spark plug fouling issue. Before CD (in 69?) fouling was a major problem. Could happen in minutes, especially in traffic. Some people even put hotter plugs in for city driving and switched to cold ones for open road/track. We all tried to use Amoco Super Premium because it was the only lead free gas. Low rpm carbon deposits can form around the top of the cylinder and the results can be disastrous after years of build-up when a trip to redline "stretches" the rod & piston into collision with the nasty carbon. __________________ Mike 04 Boxster S - Basalt/Savanna, 6sp, Carrera lites, hardtop 70 914-6 - Black over tan, original/stock PCA since 1970