Ignition Timing Marks

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Ignition Timing Marks

Postby jswagger » 23 Feb 2020, 20:22

Hi,

I'm going to be using an ignition timing light for the first time tomorrow and despite all the reading and YouTube watching I've done still have a question

Do you use the TDC or BTDC marks?

Cheers.
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Re: Ignition Timing Marks

Postby jrt » 23 Feb 2020, 21:06

Itchy's excellent explaination here http://wiki.club8090.co.uk/index.php/Pe ... 1.9_Timing i'd never done mine until a few years ago and it's all pretty easy.
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Re: Ignition Timing Marks

Postby jswagger » 23 Feb 2020, 21:22

Cheers for the link JRT, I've already read it and still have questions.

In the 1.9DG section,if it's out then how do you tell it's out?

My engine isn't starting so I'm checking the timing just to check it''not the reason.
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Re: Ignition Timing Marks

Postby itchyfeet » 23 Feb 2020, 21:27

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Re: Ignition Timing Marks

Postby itchyfeet » 23 Feb 2020, 21:31

Some more bedtime reading here

viewtopic.php?f=37&t=168808
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Re: Ignition Timing Marks

Postby jswagger » 23 Feb 2020, 21:34

Cheers for that, something else to read
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Re: Ignition Timing Marks

Postby itchyfeet » 23 Feb 2020, 21:36

To answer your question you use BTDC mark if the strobe is not adjustable
if the strobe has adjustability then set to zero and use BTDC mark or set strobe to 5 degrees BTDC and use TDC mark

Adjustable strobes always catch me out as I forget to zero them. Very dangerous.
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Re: Ignition Timing Marks

Postby jswagger » 23 Feb 2020, 22:10

Cheers all
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Re: Ignition Timing Marks

Postby ajsimmo » 24 Feb 2020, 21:18

itchyfeet wrote:Adjustable strobes always catch me out as I forget to zero them. Very dangerous.


Mine's a pain as it defaults to 10°, even if power is interrupted for just a moment. Easily missed! Why-o-why don't they all default to 0???

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Re: Ignition Timing Marks

Postby itchyfeet » 25 Feb 2020, 07:46

ajsimmo wrote:
itchyfeet wrote:Adjustable strobes always catch me out as I forget to zero them. Very dangerous.


Mine's a pain as it defaults to 10°, even if power is interrupted for just a moment. Easily missed! Why-o-why don't they all default to 0???

Sent from my ONEPLUS A3003 using Tapatalk



Mine ( Gunson) has a twidly knob which has no resistance so it gets moved every time you pack it away or sometimes just resting it down.

I set the timing then think that sounds wrong then remember, this happens every time because I don't use it as much as you might.
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Re: Ignition Timing Marks

Postby jswagger » 25 Feb 2020, 09:59

ImageHi,

Hi,

Does anyone know if the image above is with No1 cylinder at TDC or BTDC?

Cheers
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