CNG Advance curves vs LPG or 'The Liquid' with a classic

Natural Gas, CNG, LNG, NGV, CH4
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BritCNG
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Joined: Wed Jan 29, 2020 12:45 pm

CNG Advance curves vs LPG or 'The Liquid' with a classic

Post by BritCNG »

It's my understanding that LPG and CNG require more advance than 'The Liquid'
I run a single point 1960s Land rover with CNG. There's add-on TAPs (Timing Advance Processors) which give as much as 15 degs? You nail them into the low-tension side of a coil. Seems a lot to me? Is the advance curve parallel to petrol? I know that LPG isn't.

Only my 60s classic already runs 38 degrees advance at WOT. Add another 15, and we're at over 50 degs. Seems a lot to me? I've found this, are the relative curves shown typical?

I've asked this question on other forums, and never really found an answer.
Attachments
TAP Schematic.png
CNG vs Petrol.png

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