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What do you mean calculate? On 164 the computer does all the work.
 

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Discussion Starter #3
:confused: ML4.1 What formula do you use for calculating ignition advance?

FR Wilk
Alpa? You still around?

Porsche 944S/944S2 with M2.1 using a 60-2 timing wheel uses the following formula to calculate ignition advance. The 23 is a offset which allows negative ignition advance numbers.

= 0.75º X (HEX2DEC(hex#)-23)

My question is does this apply to just Porsche? The Alfa could be calibrated differently.
 

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Thanks Alpa. Any estimate at what it might be? Does Alfa spec the ignition advance at idle like Porsche does? Anyone?
Ok, I'll have a look at 1.6/1.8 carb engines. Then you could compare them with 1.6/1.8 injection tables. Twin Spark (the 2L TS) is a different design, must require less advance (like 3.6 against 3.2).
 

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Discussion Starter #7 (Edited)
Alpa? You still around?

Porsche 944S/944S2 with M2.1 using a 60-2 timing wheel uses the following formula to calculate ignition advance. The 23 is a offset which allows negative ignition advance numbers.

= 0.75º X (HEX2DEC(hex#)-23)

My question is does this apply to just Porsche? The Alfa could be calibrated differently.
I had the parentheses wrong. I was corrected on another list. Either formula below works.

=0.75º X [HEX2DEC(hex#) -30] :Offset as a decimal number
=0.75º X (HEX2DEC(hex#) - 22.5º :Offset in degrees
 
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