FWIW, the B&C starter employs a ?series field" - as does the Skytec 'NL' 'inline ' starter.
I'm in the midst of an investigation/study to characterize the current requirements of various starter models.
Based upon some measurements of the Skytec 149LS series on an O360-A1A, the first compression stroke typically requires 400 amps or more to get past TDC. I've measured two different starters on the same model engine with different batteries and wiring feeding the starters. Both starters had quite similar cranking current profiles.
Would be interested in making similar measurements on other starters - if anyone reading this in the Sacramento has a different model Skytec (different than the 149LS) and is interested in helping, please let me know. I'm also seeking someone in the area with a B & C for the same type of measurement.
Measurement of the current profile consists of putting a "clamp on" (really better described as a "clamp around") current meter around a conductor carrying current to the starter. The engine is then cranked through 2-3 revolutions with the mags off, during which time the current profile is recorded.
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