Thread: 101 LPG

Photos of the current set up.
The spacer/ ventri plates fitted with longer carby bolts and studs.
The original air cleaner rubber pipes were used,but took much fiddling to refit to the slightly wider air in take alloy castings.
101lpgmixer051.jpg - Image - Photobucket - Video and Image Hosting
On the next photo you can see the metal plug in the middle of the inlet manifold which was used to deliver the LPGas in my previous set up.
101lpgmixer052.jpg - Image - Photobucket - Video and Image Hosting
The next two photos show the simple brass fittings used to joint the 1/2 inch spacer vapour hose together to the 3/4 vapour hose from the gas convertor.
There is also a small 1/4 inch vapour line going into the main fitting for idle mixture supply as the century gas convertor is now a converted three stage one.
101lpgmixer054.jpg - Image - Photobucket - Video and Image Hosting
101lpgmixer053.jpg - Image - Photobucket - Video and Image Hosting
This next photo shows the brass needle valve now used for idle mixture control.
Behind it is a soleniod lockoff wired to the main gas lock off.
101lpgmixer055.jpg - Image - Photobucket - Video and Image Hosting
The next photos are the previous system delivering gas vapour through the manifold balance port using a century under throttle gas flow control valve with a micro adjuster linkage from the LHS carby.

Mmmm, that winch motor looks familiar.......its on my 8274

Image of clear view simple set upv into manifold - Photobucket - Video and Image Hosting
Image of under throttle 5/8 unf balance manifold port - Photobucket - Video and Image Hosting
The next photo shows the very successful gas tank mounting which is mounted between the chassis rails using a sub frame that required the minimum drilling of the chassis.
The tank being rear mounted allows the fuel filler fitting to be fitted on the back chassis to with a very short pipe to allow quick filling.
The tank ground clearance is very high with next to no chance of the tank being hit by rocks.
Image of d62 lpg tank between chassis - Photobucket - Video and Image Hosting

Image of d62 lpg tank between chassis - Photobucket - Video and Image Hosting
2007110.jpg - Image - Photobucket - Video and Image Hosting
Currently I am having a small problem with the donut spacers with a flat spot just off idle as the gas converter I am using doesn't have the big second stage diaphragm like the Italian gas converters which are designed for the Donuts/ venturi systems.
What the current system does do is supply plenty of gas for top end power which most Italian converters lack in this application.
The donut /venturi does rob some top end power on both gas and petrol due to the extra introduced restriction.
My first system was good but needed a Beam 120a gas converter with adjustable primary stage and a manifold off redesign where the gas vapour entered the main part of the manifold...........I am not prepared to do this as it was going to stop me driving my toy for too long.
My future requirement is to find a Italian three stage gas converter which can supply the goods at the right price or try a Beam 120a from work when I trip over one next and find time to fit it.

Just been doing some home work on gas tank locations and fitting on a 101.
I am happy with my between the chassis rails set up and I am not about to change it.
This is for general reference.


OPTION 1
My between chassis rail location just ahead of rear diff.
Model D62 Tank dia 432mm 63 litre capacity
Exhaust relocation, rear blackout light removal.....very tight fit and special tank sub frame fabricated.



OPTION 2
Replace petrol tank RHS with LPG tank.
Available length slightly over 1000mm.
Available diameter 300mmm ( slightly reduced under tank clearance from petrol tank )
ModelB95 Capacity 59 litres. ( dia 330mm)
( petrol tank relocated to rear of vehicle above diff and exhaust relocation )
( Special LPG tank support brackets would need to be fabricated )
(Another tank could be fitted to LHS if no winch is fitted)

OPTION 3
LPG tank in cargo area on left or right side just behind passenger area and in front of rear wheel guards.
Available length 1100mm Adviable dia 400mm
Model D100 capacity 102 litres
Tank dia 432mm( being inside the vehicle a sub compartment and vent hosing ETC would have to be installed with large hole cut in body work)
standard floor tank brackets could be used.
(two tanks could be fitted one per side.)



Option three loses much cargo area and easy side access to cargo area is lost, but is the simplest install and the one 90% of LPG fitters would take.


To be realistic the 101 really needs 100litres or more of gas capacity.
Each option has its advantages and disadvantages.
Even larger tanks could be fitted above the rear mud guards in the cargo area or on the floor length ways in the cargo area, but the lost of cargo room and the tank being in sight and in the way would be too much of a compromise for most people.

I find sup prising Option 2 has so little capacity.
It should be noted option 2 can be fitted also with the 102 litre tank (D100)
but off road clearance and looks would be a problem ( original petrol tank is about 280mm deep verses.432mm for the D100 and much harder fitting and fabrication of support brackets.
Note standard petrol tank capacity of a 101 is 110 litres

Lpg mixer options
Gas vapour injection with electronic control and oxygen sensor in exhaust to trim fuel mixture........good set up and used over seas in 101s alot. but is the most expensive option , but is becoming more popular with older vehicles as costs improve and the older hands like myself fading out of the sean and the younger LPG fitters who know nothing else take over.
Three stage convertors used and vapour mixture trimmer.



Impco LPG mixers..........very good systems and can be very efficient if the right mixer is installed, but they take up alot of room in a 101 and are not easily fitted due to the twin carby layout with forward control.
The mixer would have to be fitted between the air filter and the Y branch of the air inlet system and I would recommend a CA 260 and above.
CA 150 would be too small and kill power.
I would try a CA460 as it has very good flow and a small size.(CA300 takes up too much room)
The mixer would have to be located down beside the gearbox with piping placed to avoid chopping of panels.
Two stage convertors are needed with this system
A Impco mixer works the same as a CD Stromberg carby ,only it uses LP gas


Donuts..... these are little venturis which give a vacuum signal to the gas convertor about engine fuel needs.
General purpose donuts can be fitted to the alloy air horns just before the carbies .
A better set up is to use a engine specific donut made for a 3.5 litre Range Rover motor and with a bit of care can be fitted on to the 101 with little modification.
A three stage gas convertor is used and usually a Italian type and ensure the one you use has enough capacity for a heavy drinking V8 as most Italian convertors are designed for 4 cylinder engines and may kill top end power.
Donuts get the job done but are the least efficent system and the extra venturi of the donut will very slightly affect running on petrol too.
The best gas convertor location is on the right side of the engine bay under , behind and below the drivers seat.
Both heater pipes needed are at this location too.
Note the steel heater water pipes are of a unusual size.

Hi Ron,

So what system do I have? Since it was installed in 1992 I assume it is an inefficent one. There is also some bit that lives under the passenger seat but I have not actually taken the covers off to have a look at it.








Garry

Hi Garry.
I have seen these pics before.
You have a Impco system and there is nothing wrong with that.
What I do need is the gas mixer model number which is cast into the body of it.
It looks like a CA150 which will give good running , but will kill top end power a bit.
The item under the drivers seat area will be a gas converter unit and will most likely to be a impco item too.
A photo or any markings of it would be helpful.
Misguided 11 which I was quickly able to have a look at had a impco mixer on it and was placed towards the top of the gearbox towards the drivers side and done in a way that no chopping of the gearbox floor plate was done.
Misguided 11 to was running a Italian convertor placed near the ignition coil under the LHS seat.
The tank you have will be out of date and may or may not be worth while to get retested with new valves etc fitted.
If you are happy with the location of the tank where it is a ,replacement with a bigger item is straight forward.
A replacement tank the last time I checked is about 600 dollars........if you can get one !
Check to see if anyone will retest the old tank first as it will save dollars.
You will need to find a LP Gas compliance plate too.
If one is not fitted or it is more than 10 years old a new plate will need to be fitted,
A out of date gas system should be disconnected and emptied ,or completely removed for normal petrol rego.as when you go over the pits for the ACT rego it may cause problems and the fact your gas may have been fitted in QLD a long time ago.
Even if the system is not used the residual gas in the tank in a fire is considered a problem as is untested safety valves in the system.

Thanks Ron,

I will get some extra pics and some numbers when I can.

Yep the tank is well out of date as is the LPG compliance plate (both certified 1992). I would like to put a bigger tank in and ideally move to the drivers side so that I can fill with LPG and petrol on the same side - however for the moment I will just get the system certified - either with a new tank or with the old one. I have made some enquiries and no one likes the Rheem tank so I guess they developed a bad reputation over the years.

The system runs well on LPG so I am assuming if I get the bits that require certification either tested or replaced as required the other components will do as they are for the moment.

Cheers

Garry