Straight LPG (& Turbo)

[TassieMav]

Ok, I have had it with Dual Fuel issues (it's just so hard to get it to run reliabally on Petrol and Gas, it seems it's either one or the other) so I have decided to go straight gas for 4 reasons:
1) Gas is cheaper to run than Petrol
2) Gas it more reliable
3) Economy will improve with a dedicated LPG Engine, and
4) LPG Can be Turbo Charged easier than a Deisel and way easier than a Carbie Petrol! :D

So I have some questions for the forum guru's!

Does anyone know what size auxillary LPG Tank I can fit where the Aux Petrol Tank sits? I am thinking a 72 Litre tank off a Cab Chassis (giving me 172 litres of LPG).

Anyone want to buy an ARB 75 Litre Aux Fuel tank? :rolleyes:

What sort of improvements to the engine can I make to run with more power and economy on LPG? I have to pull the head off (still using water) so upping compression is one. Recurve Dizzy and electronic ignition is another. Anymore?

If I was to go down the Turbo line, would I need to do a total rebuild of the engine? The bottom end in mine is still strong (only done 210,000) with the only issue being the head gasket. Could I cut costs and use a turbo of, say, a VL or something similar as with a Petrol Engine I don't imagine you would run all that much boost?

Cheers guys!

[G60 Rock Crawler]

Whats it doing, mine runs good on LPG but Petrol makes in hardly idle, and runs rough and cant drive it on Petrol, ive had it with these motors, (and only had it for a week) and as they are old hardly worth spending even $20 on them, better for boat anchors

[dieseltrol]

There is a hard top in carsales that has the set up that you are talking about for sale, may be worth ringing the guy for some tips...

[jessie928]

i have had a fair few dual fuel patrols, and i have never had a problem with them on gas or fuel, injected or carby.

My advice is, if you dont know what your doing, take it to someone that does know what they are doing.

Patrols will happily run in a dual fuel config all day long till you run the rest of the car into the ground. You just need to maintain BOTH systems, and jeep it in shape, plugs, filters, pumps, carby's.... you need to keep it in tip top shape by constant use!

"What sort of improvements to the engine can I make to run with more power and economy on LPG? I have to pull the head off (still using water) so upping compression is one. Recurve Dizzy and electronic ignition is another. Anymore?"

Man if your car has a busted head gasket how do you expect it to run properly on petrol or gas?????????
it will be a PIG on petrol full stop!!!!

on gas it will a little more acceptable, as the higer burn temp seems to vaporise the water a bit more. In short, get a hed job first.

get your head shaved 40-60 thou, wind your timing up to about 15-20 degree's, get a electronic ignition kit, big coil, Quality colder plugs, keep your airfilter crystal clean for LPG mixtures, extractors, a 2 1/2 exhaust with a restrictive muffler or a 2 1/4 with freeflowing mufffler.

If you do these things and pull of your carby, clean it, put a kit in it, bolt it back on and fill it with a bowl of fuel every couple weeks, you wont ever have a problem again!

make sure if you bump the comp up you use 98 octane for petrol. Petrol is only intended to get you out of ****, not as the primary fuel, but you can have it running tip top on both.

Cheers,
JEs

[xltmav]

if running only lpg close up the plug gap to .6mm

when getting head rebuilt tell them your running lpg only

[whitie]

Also, if you are doing the head - make sure that you get hardened valve seats installed to cater for the higher temps of LPG and for the lack of lubrication in the unleaded fuels.

I have been running dual fuel in my last 2 patrols (4.5ltr autos) and never had a problem, I did always switch it to petrol before shutting off the motor so that it would also start on petrol in the morning.

This saved me from cranking the motor until the LPG liquid vaporised and spread through the air intake system, also had the added advantage of keeping petrol running through the fuel system on a daily basis.

In both of these trols, I had the main tank taken out and replaced by a 120ltr LPG tank which gave me about 95 litres of LPG when full. This gave me a range of about 400-500kms when I used to run my tank to empty. I used the 32 litre sub-tank for the petrol.

I found that an easy way to get more power was to install a K&N filter and a Hyclone (can't remember if I installed one or two Hyclones!) but each of these mods gave me more torque, the Hyclone especially below the 2000rpm range on LPG.

Cheers,
Whitie

[jessie928]

Also, if you are doing the head - make sure that you get hardened valve seats installed to cater for the higher temps of LPG and for the lack of lubrication in the unleaded fuels.

I have been running dual fuel in my last 2 patrols (4.5ltr autos) and never had a problem, I did always switch it to petrol before shutting off the motor so that it would also start on petrol in the morning.

This saved me from cranking the motor until the LPG liquid vaporised and spread through the air intake system, also had the added advantage of keeping petrol running through the fuel system on a daily basis.

In both of these trols, I had the main tank taken out and replaced by a 120ltr LPG tank which gave me about 95 litres of LPG when full. This gave me a range of about 400-500kms when I used to run my tank to empty. I used the 32 litre sub-tank for the petrol.

I found that an easy way to get more power was to install a K&N filter and a Hyclone (can't remember if I installed one or two Hyclones!) but each of these mods gave me more torque, the Hyclone especially below the 2000rpm range on LPG.

Cheers,
Whitie

the patrol already has hardened valve seats.

Jes

[whitie]

Thank's Jes,

I did not know if that was the case for the 89 4.2 petrol engine.