Twin plug /4, ROI? |
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Twin plug /4, ROI? |
r_towle |
Feb 17 2018, 04:13 PM
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#1
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Custom Member Group: Members Posts: 24,591 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States |
Has anyone done testing to understand the Net difference between single and twin plug on a /4?
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gereed75 |
Feb 18 2018, 01:34 PM
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#2
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Senior Member Group: Members Posts: 1,260 Joined: 19-March 13 From: Pittsburgh PA Member No.: 15,674 Region Association: North East States |
Agree with Glenn. The 911 benefits because of combustion chamber shape and typical high domes in higher compression builds. Allows for better timing with a more efficient burn on both “sides” of the chamber.
Not sure the same benefits will happen in a 4 cylinder. Used in aircraft engines for redundancy and also because the combustion chamber is large (360 cubic inch four banger). The second plug yields a faster and more complete fuel burn by starting two flame fronts. Again not sure that will benefit a smaller four in the same way. No testing, just anecdotal, but with dubious benefit probably the reason no testing (and relatively few applications) have been done. |
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