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Old 11-22-2005, 08:43 AM   #11
n2xlr8n
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Member#: 18960
Join Date: May 2002
Chapter/Region: South East
Location: Bama
Vehicle:
02 WRX MBP
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Quote:
Originally Posted by bboy
I've got a theory for you, mind you it's really out there.

Putting in a colder plug transferred more heat to the heads (valves in particular), the heated valves expanded more (lengthened) and closed the lash of the bucket-camshaft interface. Tighter lash meant quieter buckets and less false knock.

Please attack at will.
That's definitely thinking outside the box. Unfortunately, I have no opinion unless I have an idea how EGT and fuel were affected. When I've used a colder plug in the past in search of the tuning sweet spot, I had to make global changes to my fuel.

BTW, if the engine is 9:1 (and I'd believe Quirt), you're not only igniting a more efficient charge, it will run leaner than the same map on a 8:1 engine, and consequently make more noise.And power. What is the PN on your coilpacks?

S.
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