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940 Rich start up.

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Old Apr 6th, 2020, 22:01   #11
Laird Scooby
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I know. The choc block is disgraceful. I don't have these 'in stock' in the shed, I just needed a very quick solution in the cold. I used to solder up miles of microphone and 90 wire multicore cable in earlier times. RS days. I have heatshrink and gun. Crimps are nice, esp on larger wires- these are thinish fellows (where the new long injector 'tails' join the old un perished bulkhead loom).
Temp gauge is behaving- I did have a fractured thermostat- stuck open- the gauge tracked my wind over radiator speed, and other events. Novel, but not good.
Filter ordered just now. (Last done 2015, £20).
AICV on the list, PVC cleaned with new separator box in the last year. Must find a feeler gauge...
A thumbnail is usually about 0.6-0.7mm if you get really stuck for a feeler gauge.
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Old May 31st, 2020, 11:13   #12
arctan
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Default Update.

Both LPG filters changed.
Bosch CTS replaced as part of preventative maintenance.
Did the fuse out, and M1 trip.
Now much better at start up (Thanks again Dave).
Plugs now at point six of a mm. Good colours. Running a bit smoother.
And. Had a MBC fitted when I went to see Luke360 about some parts. I had one on a previous 940. Set at around 8 psi. Great fun, a welcome addition to life.
Not done idle control valve cleaning yet but will soon. Still got the intriguing whoosh of air out when opening petrol cap, but that's non urgent, and I'll start a new thread, along with researching the traditional 'petrol gauge misbehaving' -stuck at 80 pc. I have some resistors, to check if it is the lovely sender unit rather than gauge. . .
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Old Jun 2nd, 2020, 15:26   #13
Rversteeg
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Default Ignition and LPG

The ignition voltage needs to be I believe 20% higher for jumping a spark in an LPG mixture when compared to a petrol mixture. So any deteriorating components or flaws in the ignition system will first show up when running on LPG, especially when accelerating. A smaller spark plug gap will just make it a bit easier for the spark to jump over.
Rob
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Old Jun 2nd, 2020, 15:51   #14
Laird Scooby
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The ignition voltage needs to be I believe 20% higher for jumping a spark in an LPG mixture when compared to a petrol mixture. So any deteriorating components or flaws in the ignition system will first show up when running on LPG, especially when accelerating. A smaller spark plug gap will just make it a bit easier for the spark to jump over.
Rob
Spot on Rob - why i suggested gapping the plugs at 0.6mm to achieve this as it will reduce the voltage needed to jump that gap considerably. I can't remember the various formulae for the distance a spark will jump in free air and compressed air (or gas) but i do remember vaguely that ~5kV will jump a 3/8" gap (about 10mm) but it needs about 25kV to jump a 1/2" (13mm) gap in free air.

There used to be a device available many moons ago (probably outlawed by the H&S regimes) that could be connected between an HT lead and a spare HT lead to the plug, hinged in the middle with a scale and pointer and two pointed electrodes for the spark to jump across. Start the car and slowly open the gap until that plug just stopped firing then close it until it started firing again - then read the scale against the pointer to determine the firing voltage.

It's 30 ish years since i used one so may have the method and/or description slightly off but the principle holds true.
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