Quote:
Originally Posted by JimJohnD
As far as 'more' spark, Honda already looked at that. The Insight has 2 spark plugs with their own coils for each cylinder. The plugs are spun in so that the electrode faces the right way for the best combustion. If the plugs had the same physical specs as the stock plugs they shouldn't 'hurt' anything. Still, with all of the performance monitoring I doubt there is much improvement to be had. Without a dyno it would be really difficult to find the difference from all of the other factors in play from air temp to tire pressure.
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Most piston engine aircraft engines have had duel spark plugs per cylinder for years, both as a safety factor in having two independent ignition systems running and also for increasing efficiency of the combustion.
In fact, part of the normal pre-flight test of the aircraft is (with the engine running) to alternately switch to each ignition system to test it, before finally switching to the normal mode of running both concurrently.
If I remember correctly with the Cessnas I used to fly, when switching the ignition system to duel mode, the cruising engine speed would pick up about 100 RPM. Not an insignificant amount to be sure, but in remembering this experience, I agree with you it would be hard to imagine there could be significantly "more" power to be had ostensibly by making combustion even more efficient than the TWO sparkplugs per cylinder can already provide.
