Dual Plugs on High compression?
Posted: Sun Dec 15, 2013 8:30 am
I haven't seen much in here (searched) talking about dual plugs. In the 911 world it's old hat for higher compression engine, though expensive with off-the-shelf parts. Tried and true there, but seems black magic in VW world - which is strange to me.
Who has done it (with engine specs if possible) and with what results? My (academic) understanding is that it reduces the flame front travel needed, because you have 2 points of origin, so less ignition timing lead needed - like having much higher octane or a smaller, less detonation prone combustion chamber. Jake claims super high compression ratios are possible (and necessary).
With my limited engine build experience over the years, compared to people that do it for a living, I am always impressed with the increased responsiveness of increasing compression - but am also concerned with the aircooled engine and compression ratio for an engine that needs to live on todays pump gas and push a bus or live on the interstate for hours.
I've got a number of machinist friends that can do the 2nd plug setup, but the effort to dial in the rest of the system may not be worth it?
Who has done it (with engine specs if possible) and with what results? My (academic) understanding is that it reduces the flame front travel needed, because you have 2 points of origin, so less ignition timing lead needed - like having much higher octane or a smaller, less detonation prone combustion chamber. Jake claims super high compression ratios are possible (and necessary).
With my limited engine build experience over the years, compared to people that do it for a living, I am always impressed with the increased responsiveness of increasing compression - but am also concerned with the aircooled engine and compression ratio for an engine that needs to live on todays pump gas and push a bus or live on the interstate for hours.
I've got a number of machinist friends that can do the 2nd plug setup, but the effort to dial in the rest of the system may not be worth it?