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PostPosted: Fri Sep 14, 2018 10:33 pm 
Installer

Joined: Wed Sep 29, 2010 5:01 pm
Posts: 3212
Location: Yorkshire
Just read this http://www.lpgshop.co.uk/content/downloads/lpg%20cng%20manifold%20nozzle%20location%20where%20to%20drill%20and%20influence%20on%20engine%20work.pdf
Thought I'd be interested to read a lab condition test write-up / results but after reading it I just think... mahhhhh that was a none event.
Talks a lot about how spud position on manifold runners can effect results.. but we know this already. And petrol injectors are always close to the valves so we should want LPG injectors to be close to the valves anyway if we want the LPG system to follow the petrol fuelling strategy accurately - which of course we do.
But doesn't even impart on the effect of advanced / delayed lLPG injection due to the LPG ECU not beginning LPG injector pulse length at the same time as petrol injectors (or not ending pulse at a similar time - which multiplier effects) or effects of variable cam timing etc.
A test originally written up by East Europeans about an Australian spec car which has unusually long inlet tract port runners roughly translated to English that misses 50% of the main variables and most important aspects but probably impressive to dodgy installers and amateurs.
I doubt whoever wrote that report could hope to get decent results on half of the demanding vehicles I convert - but they can compare techy insights about changing spud position on a low demand engine with exceptionally long inlet tracts and offer conclusions based on those results.

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