While I did hear about LPG fumigation many yrs ago, it is only in the past yr that I have installed it. Basic install, 9kg lpg cylinder in the boot, gas is solenoid controlled via a micro switch on the throttle linkage ie I can adjust when it becomes operational, and then there is an over-ride switch which can turn it all off.
It is wired up from the oil pressure switch so that if the motor is not running the gas cannot flow. Currently it is set up to come on at about 60kph. gas pressure is regulated via barbecue lpg pressure regulator (.3 lbs sq in?) and fed directly into the inlet manifold. Memory serving me right the largest jet I have is 1mm in dia which gives an enrichment supposedly of 10% tho I think it may in fact be higher.
Lpg tank , using largest jet, is good for about 3000 km.
Incidentally not only better economy, but also power increase, quite noticeable traversing hilly terrain.
Another option to add would be a fuel heater, my guess being, based on earlier experiments, to be good for perhaps 7-10%. Cold air intake may also add another few percent.
Statistics: Posted by van — Mon Sep 22, 2014 5:22 pm
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Doesn't time fly when you are having fun?? Hard to credit that 5yrs have flown by.Well the old van is history, I parked it up about 2yrs ago and it has been sitting there deteriorating in the weather in the interim. It was replaced by an '86 Holden Commodore VK Berlina, retro-fitted with an LD 28 Nissan diesel an engine I am rather fond of. Initially little was done to it, tho recently I added an LPG fumigation array to it which saw the lpk rise from 12-15ks per l to over 20ks per litre close to around 60mpg. Much more can be done I am sure, but lacking access to a workshop and frustrated trying to source certain goodies, will probably mean it won't get much further than that.
Bill
Statistics: Posted by van — Sat Sep 13, 2014 11:50 pm
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cat, 2 3/4" piping, drop back to 2 1/2" after the rear diff, 1 into 2 rear
muffler, 1 straight though resinator. You still need a bit of back pressure
so you don't lose early torque. Yeah a snorkle for your intake is good.
40c two days in a row here. Too bloody hot to do anything. Cooler now.
Cheers !
Statistics: Posted by Hybrid — Thu Jan 15, 2009 6:29 am
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No mate she is a diesel.
I have had a quick squiz underneath, and the exhaust is a plumbers nightmare, tight corners and restricted flow, so that will be another job to look at. Air intake is not much better and will have to examine that too, possibly a snorkel.
Where in NSW are you? Heatwave and fires? Nice and cool here, about 22-25, right weather for fishing!
Went out this morning and caught a kahawai, your sea-trout I believe.Statistics: Posted by van — Thu Jan 15, 2009 4:03 am
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Cheers !
Statistics: Posted by Hybrid — Thu Jan 15, 2009 12:21 am
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My initial gains of 50% over town running have not been realised.
Conditions at the time of travel may account for that as a short steep climb was followed by a long gradual downhill ride plus a following wind of up to 50-60 kph.I have since done one period of primarily town driving giving a 15% increase and another longer trip giving 30% over town. In essence both town and country driving have seen a 15% improvement.
My next project will be to devise a means whereby the fuel can be heated to a higher temp which currently is 41C drawn from a water temp of 76C. If room permitted (and I may yet be able to make room) a longer section of SS tube with more coils then used currently might help there. Another alternative would be to make some sort of a bypass whereby the return fuel to the tank is diverted to feed straight back to the inlet of the fuel heater, raising the the temp of the cold fuel from the tank. Air bubbles may present a problem there however.
Statistics: Posted by van — Wed Jan 14, 2009 11:06 pm
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