Electronic Ignition (123)

Simon Perks · Feb 15, 2018

Greetings from the Alps,
So I have the following 'lectronic dizzy on my SIII, I am unable to actually work out which curve i need for the engine (5MB) and was wondering if anyone else has such a piece of kit fitted or can decipher which curve setting i should use, at the moment it's on E.

Ticks over fine but it flats out real early ..

http://www.123ignition.nl/product.phtml?id=271

thanks for any advice.

Simon

cornish rattler · Feb 15, 2018

Do it by ear advance or retard it with the engine running, drive it and re-adjust again if need be

Simon Perks · Feb 15, 2018

cornish rattler said:
Do it by ear advance or retard it with the engine running, drive it and re-adjust again if need be

The timing point is bang on, as i have a new timing chain fitted it really is as close as it can be but this is not the problem.
The problem is that as the dizzy has no real advance retard vacuum tube so this is a setting based on the table in the link.

I cant find any info in the haynes or online to give this ... this is what im looking for ..
so the maximum number of advance degrees at 4500rpm, 2000 & 3000 ( at the moment its at 26 & 12 )

Tall Ratbag · Feb 15, 2018

The green book gives 40 degrees of advance at the crank at 4500 rpm

Simon Perks · Feb 16, 2018

Tall Ratbag said:
The green book gives 40 degrees of advance at the crank at 4500 rpm

Ok so that tells me that with an advance at the crank of 26deg plus 14at the vacuum I have the 40, what does the green book say at 2000?
the options are:
7.5
10
12
14

Simon

Tall Ratbag · Feb 16, 2018

No, the 40 degrees is not including the vacuum advance.

Simon Perks · Feb 16, 2018

Tall Ratbag said:
No, the 40 degrees is not including the vacuum advance.

max curve is 26@4500 Mmmmm
anyhow what does it give for 2000?

simon

Citizen Kane · Feb 16, 2018

I think its up to you to decide which curve best suits your engine. It might not even be one of the curves that gives you the full 26deg advance. The original advance curve would probably have a +/- tolerance at 2000 rpm as large as the variation in the choices you have available in the C to F range, after all it was only a simple pair of bob weights and springs.

Electronic Ignition (123)

Simon Perks

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cornish rattler

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Simon Perks

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Tall Ratbag

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Simon Perks

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Tall Ratbag

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Simon Perks

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Citizen Kane

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