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Special Coupe Frank · 02-26-2011, 12:06 PM

FWIW in terms of cranking speeds, my un-restored '28, with a tired 84,000 mile engine, on six-volts cranks at about 15 compression-impulses ("grunts") in 5 seconds
( that's about 5 c-i / second ). (Very similar to our old Ford 9N tractor)

If the temps are down around 0* F, it slows-down to about 10 c-i / 5 seconds, or 2 c-i / sec.

5 c-i / sec seems to be the maximum cranking speed for my car, whether the engine is at 32* F or fully warmed-up.

If yours sounds like a blender, I'd bet the starter still has 6-volt fields in it.

02-26-2011, 12:06 PM	#7
Special Coupe Frank Senior Member Join Date: May 2010 Location: Northeast Penna Posts: 2,108	Re: Starter field coils and cranking speed FWIW in terms of cranking speeds, my un-restored '28, with a tired 84,000 mile engine, on six-volts cranks at about 15 compression-impulses ("grunts") in 5 seconds ( that's about 5 c-i / second ). (Very similar to our old Ford 9N tractor) If the temps are down around 0* F, it slows-down to about 10 c-i / 5 seconds, or 2 c-i / sec. 5 c-i / sec seems to be the maximum cranking speed for my car, whether the engine is at 32* F or fully warmed-up. If yours sounds like a blender, I'd bet the starter still has 6-volt fields in it.