Posted by John T on December 30, 2008 at 06:09:09 from (66.244.97.31):
In Reply to: Timing Question. posted by Guido on December 30, 2008 at 05:40:01:
Hmmmmm where does it "originate" you ask.
Wellllllllll, since "timing" primarily has to do with when the spark occurs relative to the pistons location (i.e. TDC or 25 BTDC etc) I would say it originates with (per your choices) the crankshaft cuz its location determines the pistons location.
That being said, the rotational adjustment (timing) of the distributor is a function of FIRST the cranks position,,,,,,SECOND the timing chain (if one is used),,,,, THIRD Camshafts position (regardles if chain or direct driven) FOURTH any gears that connect the distributor shaft to the camshaft,,,,,,,,FIFTH the location of the distributor (its timing adjustment) as that determines when the ignition points break open to create the spark to ignite the fuel..
THAT STILL LEAVES ME WITH IT ORIGINATING AT THE CRANKSHAFT AS THAT DETERMIENS THE PISTONS LOCATION.
However, the wear and slop and gear mesh of alllllllll those components such as cam n chains is what determines where the distributor needs located (its rotational timing) in order that the spark occurs at the right time relative to the pistons location (i.e. the ORIGINATING CRANKSHAFT POSITION)
NOTE this is a one size fits all answer and, of course, some engines use a timing chain many a gear to gear cam to crank while the distributor might be driven off different sources like oil pump shafts n camshafts etc etc but regardless, its still the location of the piston thats critical for when the spark occurs adn thats a function of the crankshafts position
THATS MY STORY N IMA STICKIN TO IT LOL
Hey I'm an Engineer and an Attorney my brain likes to over analyze and overword these type questions lol.......
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