Wierd Timing...
Thread Starter
Instructor
Joined: Apr 2006
Posts: 243
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From: Canton MI
Wierd Timing...
I have been struggling to figure out a hesitation problem, among all the other problems I have with my engine. I finally decided not to put any more money into it and start saving all those pennies for a new engine.
That said, I figured I'd try to get the best out of my current setup so I can drive the car this summer. On a whim, I started messing with the timing and ended up at 4* base timing (BTDC). 8* was dismal, 6* was a little better and 2* was OK but still felt a little flat.
Granted I have no idea what the cent/vac advance is doing, can anyone explain how I could be using half of the factory setting? Of course, I should mention, this was all tuned without centrifugal or vac advance working. Thanks!
That said, I figured I'd try to get the best out of my current setup so I can drive the car this summer. On a whim, I started messing with the timing and ended up at 4* base timing (BTDC). 8* was dismal, 6* was a little better and 2* was OK but still felt a little flat.
Granted I have no idea what the cent/vac advance is doing, can anyone explain how I could be using half of the factory setting? Of course, I should mention, this was all tuned without centrifugal or vac advance working. Thanks!
Melting Slicks
Joined: Aug 2003
Posts: 2,135
Likes: 2
From: Dayton Oh
Fig A is to verify that your harmonic damper outer ring has not slipped and throwing your timing indication off.
Do this by correctly determining your 0* timing mark on the damper as follows:
1) disconnect the battery cable
2) remove #1 plug and insert a piston stop
3) gently rotate the engine by hand clockwise until #1 piston just contacts the piston stop.
4) make a mark on the damper immediately across from the timing pointer.
5) gently rotate the engine by hand counter clockwise until the #1 piston again just contacts the piston stop.
6) make a 2nd mark on the damper immediately across from the timing pointer.
7) make a 3rd mark EXACTLY between the first two marks. This is your EXACT 0* TDC timing mark. If this mark does not agree with your damper's 0* mark then your outer ring has slipped.
Do this by correctly determining your 0* timing mark on the damper as follows:
1) disconnect the battery cable
2) remove #1 plug and insert a piston stop
3) gently rotate the engine by hand clockwise until #1 piston just contacts the piston stop.
4) make a mark on the damper immediately across from the timing pointer.
5) gently rotate the engine by hand counter clockwise until the #1 piston again just contacts the piston stop.
6) make a 2nd mark on the damper immediately across from the timing pointer.
7) make a 3rd mark EXACTLY between the first two marks. This is your EXACT 0* TDC timing mark. If this mark does not agree with your damper's 0* mark then your outer ring has slipped.
Thread Starter
Instructor
Joined: Apr 2006
Posts: 243
Likes: 0
From: Canton MI
Funny you should mention that...I was just going to post another question.
I have a bad vibration that I suppose is either a flywheel or damper. My thought was that the damper had unlaminated from itself...is this another indication that this could be the case? At any rate, I know I need to remedy the problem or I am going to have a huge mess. For the time being, I am keeping the revs down as much as possible and driving the car when I can (when its not 30 degrees outside).
I have a bad vibration that I suppose is either a flywheel or damper. My thought was that the damper had unlaminated from itself...is this another indication that this could be the case? At any rate, I know I need to remedy the problem or I am going to have a huge mess. For the time being, I am keeping the revs down as much as possible and driving the car when I can (when its not 30 degrees outside).
