Timing 101
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Postmaster
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Timing 101
I'm talking carbed vehicles here.....
Isn't it true that if the distributor holddown screw has never ever been loosened, the ignition timing will never change?
If so, then all these so-called mechanics who felt the engine needed to be timed were wrong....it could be checked/verified, but no need to adjust.
Isn't it true that if the distributor holddown screw has never ever been loosened, the ignition timing will never change?
If so, then all these so-called mechanics who felt the engine needed to be timed were wrong....it could be checked/verified, but no need to adjust.
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Postmaster
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This isn't about my 83, or any problem I'm having, it's an automotive engine theoretical question.
In reply to your reply, how can the ignition timing have changed if the distributor has never moved?
In reply to your reply, how can the ignition timing have changed if the distributor has never moved?
Postmaster
Joined: Mar 2003
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From: Spokane WA
Originally Posted by mnmzimmer5
That's why the have timing lights...so you can check befor adjusting
Automotive theory type questions are how we learn, I dont think its a stupid question at all.....
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I didnt mean to offend, just keeping the note short and sweet. Didnt read all of the post to see the second response about it being theory...my bad
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From: Florida
Originally Posted by Icicle
Timing chain stretch....... Distributor Gear wear perhaps (thinking out loud)..... lots of things Im not thinking of probably
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From: Spokane WA
Originally Posted by mnmzimmer5
I didnt mean to offend, just keeping the note short and sweet. Didnt read all of the post to see the second response about it being theory...my bad
I wouldnt sweat it.
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Joined: Nov 2005
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From: Rockaway Beach
reasons why the timing change
1 mechanical timing , the chain wores out , cam bearings wore out , cam breaks
chain tensoiner breaks , distrubuter shaft wears out , advance springs weaken ,rotor comes lose , gears wear out , lack of proper lubercation
2 electric timing , excessive arching , spark plugs burn down , bad plug wires , rust ,
water , carbon , bad cap , bad pick up coil , bad coil , low voltage , bad computer ,
bad sensors
That should cover a few thing why the timing changes & the distributor hasnt move
1 mechanical timing , the chain wores out , cam bearings wore out , cam breaks
chain tensoiner breaks , distrubuter shaft wears out , advance springs weaken ,rotor comes lose , gears wear out , lack of proper lubercation
2 electric timing , excessive arching , spark plugs burn down , bad plug wires , rust ,
water , carbon , bad cap , bad pick up coil , bad coil , low voltage , bad computer ,
bad sensors
That should cover a few thing why the timing changes & the distributor hasnt move
Fleet Owner
Joined: Sep 2005
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From: Lake Tahoe, Nevada
Other than mechanical wear, I don't think we have a valid answer yet.
I will add a question: What does Ford ignition, with no crank sensor, use as a zero reference for timing? Can there be any error there?
Srercrcr, are you saying that it does change, untouched?
I will add a question: What does Ford ignition, with no crank sensor, use as a zero reference for timing? Can there be any error there?
Srercrcr, are you saying that it does change, untouched?
Postmaster
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From: Spokane WA
Originally Posted by Bdox
I will add a question: What does Ford ignition, with no crank sensor, use as a zero reference for timing? Can there be any error there?
aside from crankshaft position, valve timing can be off, so while your ignition timing may be okay, valve timing may not be.
Fleet Owner
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From: Lake Tahoe, Nevada
Originally Posted by Icicle
Answer, Top dead Center, and of course there can be error..... A dizzy in 180 off aside from crankshaft position, valve timing can be off, so while your ignition timing may be okay, valve timing may not be.
aside from crankshaft position, valve timing can be off, so while your ignition timing may be okay, valve timing may not be.