Gentlemen

Speaking of 10:1 compression ratios.  If I tap the outside case and TIG weld
two  stainless sparkplugs holders to the inside liner, side by side at the
leading plug location it is conceivable that the compression ratio would go
down  as the effective combustion chamber would increase about 0.3 cubic cc.
in volume.  This is because the standard plug itself has a bit of a
standoff, perhaps 2mm, from the inner liner as well as a cross shaped gap in
the end of the plug.

In operation the  air and fuel would be compressed but just before light-off
the compression would decrease slightly.

I'd liked a vote on this before I start milling and welding on the scrap
housings.

Q. Is a slight decrease in compression ratio offset by the merits of having
a redundant leading plug ignition system?

Doug in Japan

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