Please Confirm Or Deny?

horseballz · Aug 2, 2015

Hey All,
Please tell me if I'm reading this info correctly:

Given that the curve is specified at "distributor" RPM and "camshaft degrees" all the numbers are actual supposed to be "double" what is listed, when standardly testing with a timing light on the crankshaft, due to the crankshaft turning twice for each turn of the cam and distributor? I am assuming that all timing on most engines is done by crankshaft rotation reference? IE: 7 degrees maximum vacuum advance at 20 inches vacuum is actually 14 degrees and maximum centrifugal advance is 22 degrees at 4000 engine RPM?

Thanks Folks,
Gene

rbohm · Aug 3, 2015

yes the numbers would be doubled for crank degrees.

horseballz · Aug 3, 2015

Thank you sir! It's nice to confirm assumptions before/instead of just acting on them! I would also "assume" that we would ignore the vacuum retard specs, unless of course we were dealing with a concourse calibre vehicle that actually had one of those goofy dual diaphragm distributors?
Thanx Again,
Gene

horse sence · Aug 3, 2015

Phew ! From the headline ,I thought he found out i was actually ....BAT MAN.

rbohm · Aug 4, 2015

horseballz said:
Thank you sir! It's nice to confirm assumptions before/instead of just acting on them! I would also "assume" that we would ignore the vacuum retard specs, unless of course we were dealing with a concourse calibre vehicle that actually had one of those goofy dual diaphragm distributors?
Thanx Again,
Gene

that depends. are you building a super or turbocharged engine? if so the use the retard function. run the boost line to that diaphragm and you get an automatic boost retard feature.

horse sence said:
Phew ! From the headline ,I thought he found out i was actually ....BAT MAN.

oh heck we found that out years ago.

Please Confirm Or Deny?

horseballz

rbohm

horseballz

horse sence

rbohm

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