Quote:
Originally posted by T77911S
wydryd, if you are worried about detonation, from what i have read, detonation is related to timing and fuel mixture and not the plug heat range. if you put in a cold plug, the soot left on the plug is unburned fuel which equals inefficient combustion which is why you have lean back out.
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Running a plug that is too hot for your motor could potentially result in pre-ignition. The tip of the spark plug is too hot and this ignites the A/F mixture even before the plug fires a spark. Not good for a motor.
Anyway, just replace the spark plugs with whatever the factory manual states, especially if the plugs are old and the gaps have changed due to wear'n'tear.
I think the 964's ran the BOSCH FR6DTC triple electrode plugs.
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Merv
'89 911 Turbo Cab
Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition 
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