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911nut 911nut is offline
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Join Date: May 2001
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Twin plugging is use on high compression N/A 911 engines because the piston dome cuts off half of the chamber, which retards the velocity of the flame front. The unburnt mixture on the other side of the dome then combusts in a uncontrolled manner which results in the pinging that can sometimes be heard.
As 125shifter stated, it stands to reason that the flat top pistons used in turbo motors have the same issues.
It's interesting that Porsche didn't use twin plugs on the 3.6 turbo engine. Could it be they didn't feel that the added complexity and expense were worth limited benefits?
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'91 964 Turbo
Port matched, SC cams, K27/K29 turbo, Roush Performance custom headers w/Tial MV-S dual wastegates, Rarlyl8 muffler, LWFW, GT2 clutch & PP, BL wur, factory RS shifter, RS mounts, FVD timing mod, Big Reds, - 210 lb
Old 03-04-2008, 07:16 PM
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