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beepbeep beepbeep is offline
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Join Date: Jun 2001
Location: Sweden
Posts: 5,560
Hello.

Twin plugging speeds up the combustion. Things go "booom" much faster so you don't need to advance as much as you do on single one in order to wait for slow "boom" to be finished.

Nice thing with fast "boom" (if you adjust the advance) is that it happeds nearer TDC so you can use more energy in "boom" to push piston downwards, instead if starting to lighten up when piston is movin upwards.

So yes, twin plugging makes power. But you *must* adjust ignition accordingly or you will have "boom" trying to push piston downwards as it happends sooner than with single plug.

I recon that you can gain 7-10% in HP department on typical 930 engine based on speedy combustion and optimized ignition.

You can use it to gain power or gain detonation margin...but it's a nice thing.

Also, I don't believe in multi-pronged spark plugs. Ordinary NGK copper-plugs of suitable heat range is IMHO best solution. For extra 1%-2% procent, plug-indexing is possible.
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Old 03-05-2008, 11:53 AM
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