|
Ford, Nissan, Mercedes. Twin plugs go back a very long way, before WW2. Very common on aircraft engines.
The reasons can vary greatly. In most modern applications it's emissions. In aircraft a backup ignition system would be a reason with a magneto to provide an ignition in the event of catastrpohic electrical system failure.
In racing applications, better power and or economy.
reagrds
mech
|