Timing Considerations

[pickman]

Whilst installing a new dist. I have not used the crankshaft damper timing mark previously as it can only be seen in a static position not with strobe.
Aligned the damper mark with the mark on the casting housing. Having established where no. one cylinder fires and assume this is TDC? Then check the flywheel and no balls are evident or marks. I can use the strobe on the fly wheel and find the timing marks on testing.

What is the relationship between the TDC crank pulley vs the flywheel marks?

 

[Mike Goble]

I painted two timing marks on the harmonic balancer, one representing TDC, and the other representing 36° BTDC. To do this, I made a timing tab out of an old differential tag and attached it to the block using a bolt near the alternator mount. I set the engine to TDC using the engraved TDC mark on the balancer and the index on the timing cover. I then painted a white mark on the timing tag and extended it into the balancer. I measured 10% of the balancer circumference and made a mark on the balancer representing 36° BTDC. Now, when I time my motor, I just rev it up to 3500 rpm or so and set the mechanical advance to 36° BTDC. This is much easier than peering through a small hole for a BB flying by at 90 mph. You can easily see the timing tab in the picture.

 

[HB Chris]

The crank makes two complete revolutions to one on the cam. Turn it another 360 degrees. Better yet, pull valve cover and see if both #1 valves are closed and mark on back of cam it centered.

 

[sfdon]

Look in the oil cap with your flashlight. You will see whether #1 or #6 cam lobes are up or down

 

[Stevehose]

“0” ball is TDC and “Z” ball is 22 degrees BTDC

 

[sfdon]

TO and Z

 

[pickman]

Got the Z mark statically set on the flywheel the rotor should be pointing at the #1 plug wire? Assuming the cam is in proper orientation.

 

[sfdon]

you will be 20* off

TO on Damper
TO on flywheel
Rotor pointed at mark on distributor

 

[deQuincey]

you will be 20* off

TO on Damper
TO on flywheel
Rotor pointed at mark on distributor

22º ?

 

[deQuincey]

Here

 

[pickman]

Further reading the fly wheel needs to be a TDC mark the rotor points to #1 I will add one additional flywheel mark 1/2 between Z and TO as a 10° mark for reference.

 

[Stevehose]

Further reading the fly wheel needs to be a TDC mark the rotor points to #1 I will add one additional flywheel mark 1/2 between Z and TO as a 10° mark for reference.

and when at TDC your harmonic balancer should have a mark that lines up with the notch on the lower timing chain cover. Paint that line also. I use red paint for all things TDC and white for advance Z ball

 

[pickman]

At 500 RPM the flywheel marks 0° at 1050 RPM flywheel marks about 15° at 2100 RPM at Z mark 22° I noted 8 flywheel teeth between TO and Z mark about 2.75° per tooth that would be about 13 teeth to 36° mark @3000 RPM? Maybe I am getting this? This curve is based upon example from Stevehouse.

 

[sfdon]

116 teeth

360 divided by 116

 

[pickman]

Well i I am trying!

 

[pickman]

So there are 116 teeth?

 

[Stevehose]

At 500 RPM the flywheel marks 0° at 1050 RPM flywheel marks about 15° at 2100 RPM at Z mark 22° I noted 8 flywheel teeth between TO and Z mark about 2.75° per tooth that would be about 13 teeth to 36° mark @3000 RPM? Maybe I am getting this? This curve is based upon example from Stevehouse.

Let's take a step back. What kind of timing light are you using - does it have an adjustable dial back feature or is it just a light?

 

[deQuincey]

Let's take a step back. What kind of timing light are you using - does it have an adjustable dial back feature or is it just a light?

he does not read my posts, or maybe i can not explain well

 

[HB Chris]

So there are 116 teeth?

Yes as Don confirmed

 

[Mike Goble]

Got the Z mark statically set on the flywheel the rotor should be pointing at the #1 plug wire? Assuming the cam is in proper orientation.

So there are 116 teeth?

Unless you get the meth version, then there are fewer...