Thread: LPG coversion for Discovery puzzle

whats about cng in the d oil burners

I'll pass on some information I picked up at the last Australian Caravan Club muster.

I was talking to a guy who had a later model 5.8i F100, running duel fuel with the old gas carby system, feeding into the EFI air intake.

I asked him about backfire and he said, "It hasn't backfired in years". Apparently another F100 owner told him to change the plug leads. Buy new ones of all different sizes and do NOT let them sit together.

Now I'm not an autolec, so I do not know if this is true, the theory was all the plug leads lined up together will cause backfire from electrical impulse. Have the plug leads all over the place so they do not come in contact with each other, the problem goes away.

Maybe some one who has the old LPG and backfiring problem could try it and lets us know?

Ron

If you look at a Range Rover Classic manual, it has diagrams of how the plug leads should be run.
Parallel is OK. Crossing the leads is not OK. The manual shows which leads to cross where unavoidable so that the induced spark if any happens at a time that will not hurt.
I wonder how many people ever look at these things and how many LPG cars with backfire problems have the leads routed correctly.
Regards Philip A

I had a VN commodore on gas, whenit backfired it fairly launched the airbox lid, we had to fit springs to the lid so when it did backfire we didnt lose the clips or damage the lid, with modern systems its difficult to satisfy both lpg and petrol requirements with tuning.
Gas Research were turning out some intersting systems, dont like Impco stuff much, Victoria do the cheapest conversions around but I think u get what u pay for.

I took my D2 V8 to the 'Gas man' in Alexandria yesterday after being recomended by Graeme Cooper, he say's a Seqential Injection sysyem is very simple for a D2 and will cause no drames ( to be fair, he would say that ), but confirmed the 'older' style and cheaper system would be a nightmare to maintain if you don't keep on top of it, approx 4k to have scuba tanks in the rear for seqential and can have it done next week..i'm getting a quote from him today with a bit more info so will report back,

Ray

Blah Blah blah...... Just get the sequerntial injection system and live happily ever after.

It's great. I have been running one for 30k on an 02 D2 and it has paid for itself already. You will slash 40% off your fuel bill, you wont know it's on there and you get 300km extra range as well. The mileage is only about 10% worse...

Don't do the old style, it's crap, high maintenace and will make your legendary machine a piece of junk and you will burn more gas and take longer to break even.

If you are in Brisbane, gve me a call, in Sydney. Listen to Greame cooper, HE KNOWS OK!

Hardest thing is getting the mainfold tank, but I got mine off ebay for 800, and had it shipped, and restamped for ten years for a total of $300.

I garuantee you will never look back.

Don't forget the Government cashback thing of $2000 - your LPG conversion will pay off in even less time

Originally Posted by ex8rarsig

Thanks for the very helpful info everyone. These are my calculations and why I am seriously considering the $4000 investment.
Kms travelled a year 40,000
LPG useage approx 16.7 litres per 100kms
LPG litres used per year 6680
LPG useage approx 20 litres per 100ks
LPG litres used per year 8016
Annual LPG cost @ approx $1.40 per litre $9352
Annual LPG cost at approx $0.60per litre $4810
Savings per km $0.114
Cost of conversion $4000
Cost back in approx 35,000ks or less than a years running
BUT I don't want to have the hassles if it is a pain in the **** or starts breaking other things that cost more money. I am going to contact some of the dealers you have variously mentioned but Iam more optimistic now than before. Thanks once again.

I agree,I got my D1 done 11 months ago.New plugs and leads(low resistance) and the boss has racked up 44k's of trouble free driving.It has paid itself off already. Pat