Please Confirm Or Deny?

[horseballz]

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]

yes the numbers would be doubled for crank degrees.

 

[horseballz]

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]

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

 

[rbohm]

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.

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

oh heck we found that out years ago.