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 Dynamic engine timing on PA using a strobe
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mdtech12

United Kingdom
24 Posts

Posted - 08/09/2017 :  12:54:30  Show Profile
The manual for my PA says that the points should just start to open when the marking identified as "IGN" on the flywheel is in central alignment to to the clutch inspection housing. Great, so with a 12V bulb across the points terminal and earth I set the points and the engine runs OK. Now I decided to check this out dynamically with a strobe light and at approx 900 rpm found a previous white line painted on the flywheel which a predecessor put on now aligns with the centre, being a little closer to the TDC mark.

My question is, should I rotate the distributer when the engine is running so that the IGN mark aligns once again or not. The engine seems to run ok as is but really would like to know what I should do when check ing with a strobe light.

Many thanks

Mike

george

United Kingdom
535 Posts

Posted - 08/09/2017 :  14:12:37  Show Profile
Mike ,the figure given in blower is the static advance setting . The result you get with the strobe is the dynamic setting with the auto advance taking effect, both are correct. Geoff
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MR.B

United Kingdom
31 Posts

Posted - 12/10/2017 :  09:01:28  Show Profile
Forgive my ignorance
1. How do you view the flywheel (for static timing) on my PB?
2. Lightbulb. Positive to the points (which side of the points) and negative to earth. Is this right?
I don't want to start the car without at least reasonably accurate timing.
Thank you
Michael
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KevinA

New Zealand
33 Posts

Posted - 12/10/2017 :  10:22:19  Show Profile
I can answer question 2- lightbulb should be between earth and the points side of the coil.
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KevinA

New Zealand
33 Posts

Posted - 12/10/2017 :  10:23:20  Show Profile
and oh yes, Conventional light bulbs don't have a positive or negative
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george

United Kingdom
535 Posts

Posted - 12/10/2017 :  10:29:14  Show Profile
The flywheel and timing marks are visible through the access hatch with 2 bolts on the top forward face of the gearbox bellhousing. geoff
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MR.B

United Kingdom
31 Posts

Posted - 12/10/2017 :  12:09:39  Show Profile
Really sorry Kevin. Please explain exactly "points side of the coil" for this dunce. Is that the SW terminal on the coil (which on mine is a white wire which I think runs to the base of the distributor?

And thank you George. I had looked there but didn't see the flywheel (blind as well as dumb!). I'll look again.

Michael
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KevinA

New Zealand
33 Posts

Posted - 12/10/2017 :  21:40:17  Show Profile
Yes, it is the wire on the coil which runs to the base of the distributor.

Could you look at your battery though and make sure the negative terminal is connected to earth. If so then all is good but if not it is highly likely that your coil is connected the wrong way round. It wouldn't cause any harm but just wouldn't work as well
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MR.B

United Kingdom
31 Posts

Posted - 12/10/2017 :  22:00:36  Show Profile
Thank you again Kevin
Michael
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LewPalmer

USA
2005 Posts

Posted - 13/10/2017 :  00:34:24  Show Profile
On a PA (and PB), the TDC and Ignition marks aren't easily visible, as they are scribed on the circumference of the flywheel and not the flat face. So one needs to look carefully to see the marks. On my flywheels I have extended the marks onto the flat face with a couple of lines of white paint.

Lew Palmer
PA1169, PB0560
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coracle

United Kingdom
118 Posts

Posted - 13/10/2017 :  12:31:23  Show Profile
Not being a keen contortionist and disliking smoke and mirrors, I have painted two segments on the front pulley to line up with a convenient marking on the front housing (a bolt edge in my case.) Green from TDC to static ignition point and red from there on to maximum advance. This means I can relax in a garden chair with a strobe shining on the pulley, whilst adjusting the advance at the distributor.

I realise that this is not as accurate as the flywheel markings but it is effective, comfortable and good enough for me.

P.S.

I set the points before first start up using a very thin bit of paper gripped between them, adjusting at the ignition point when the paper is just freed as the points open. Saves messing about with leads and a bulb and good enough for a reliable start up.

Edited by - coracle on 13/10/2017 12:38:06
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Blue M

United Kingdom
743 Posts

Posted - 14/10/2017 :  12:57:09  Show Profile
With a pointer attached to the dynamo the timing marks can also be painted on the dynamo fork ring which of course runs at engine speed. This is very convenient for using a strobe and moving the distributor at the same time.
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