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rotorwrench · 02-07-2021, 11:38 AM

The actual Lycoming BB V12 engines are pretty rare since Auburn only made 14 speedsters with that engine. They only had single spark plug ignition for those. When American LaFrance purchased the rights to the engine and tooling, it was changed to dual spark plug ignition so this is how a person can tell one from the other aside from the engine data plate and various casting markings.

The Seagrave engines were made from a Pierce Arrow design V12. Those old fire trucks were big and heavy so they needed a powerful engine and a lot of gearing to get them going in a hurry.

Lincoln V12 distributors were modified to work for flat V8s as well.

02-07-2021, 11:38 AM	#40
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,472	Re: Dual points for increased dwell?? The actual Lycoming BB V12 engines are pretty rare since Auburn only made 14 speedsters with that engine. They only had single spark plug ignition for those. When American LaFrance purchased the rights to the engine and tooling, it was changed to dual spark plug ignition so this is how a person can tell one from the other aside from the engine data plate and various casting markings. The Seagrave engines were made from a Pierce Arrow design V12. Those old fire trucks were big and heavy so they needed a powerful engine and a lot of gearing to get them going in a hurry. Lincoln V12 distributors were modified to work for flat V8s as well.