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Thread: V8 Engine

  1. 20th June 2005, 04:45 PM #1
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    V8 Engine

    I am thinking of buying a Range Rover V8 (in the next 6-8 weeks if somebody has one for sale). I would want to convert it to run on LPG/dual fuel. I was told today by a mechanic that does these conversions that the dual carbs are very hard to convert, but single carb should be OK. He also said that he has had problems with the valves in these motors when running on LPG. Do these only come standard with dual carbs? I would prefer carb model not EFI. Would the valve problem only be with the pre-unleaded motors or is it through all models? Has anybody had any of these problems?

    Thanks
    Andrew
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  2. 20th June 2005, 07:43 PM #2
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    Get an efi version, you will be much happier and the lpg conversion is straight forward for these as it is with single carb versions. My 84 is currently set up for lpg only using a gore research system, if for any reason I want to convert to dual fuel then it is just a matter of getting a 4 barrel carby, a lpg mixer ring and a petrol tank and plumbing. The system I have uses an Offenhauser 4 barrel inlet manifold which is a low profile version so gives good bonnet clearance with whatever you put on top.
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  3. 20th June 2005, 07:55 PM #3
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    How many k's have you run it on LPG for? Any problems with valves?

    Andrew
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  4. 20th June 2005, 08:31 PM #4
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    I've got dual fuel on my 79 4.4.
    It runs twin SUs instead of the standard setup (SU's don't have a diaphragm).

    Dual carbs are NOT hard to convert, and your mechanic should know that.
    You do require 2 mixers (one for each carb), and only 1 converter. A 'Y' piece hose connects to the 2 mixers.

    Tuning is identical to petrol.

    I don't think the valves will be a problem, as all V8s run hardened valve seats.
    I did have a burnt ex valve (cause unknown) which then allowed raw gas into the exhaust. Result - big bang, and a muffler peeled open like a banana.

    I have heard rumours that all new gas conversions require a closed loop setup.
    This means that there will be extra costs for carby engines (ex gas sensor, computer, motor driven converter etc).
    Note, this is only a rumour, and I cannot substantiate it.
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  5. 20th June 2005, 11:00 PM #5
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    I have run gas since 1983 motor has done 400k and of that 300k on gas . Holly 350 made things easy , no problems with valves as as previosly stated as they are hardened. I did early on run a upper cylinder lubricant and even used diesel as the lubricant made it smoother but now as its old I havent bothered.
    Gas is the way to go I have never looked back
    Brad
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  6. 20th June 2005, 11:29 PM #6
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    <div class='quotetop'>QUOTE</div><div class='quotemain'>How many k's have you run it on LPG for? Any problems with valves? [/b][/quote]
    I have done approx 30,000kms since I have had the RR and about 100,000 all up on gas with no problems.
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  7. 21st June 2005, 03:49 AM #7
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    Thanks guys - I think I will have to assume that he just doesn't want to do the conversion and go somewhere else.

    Andrew
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  8. 21st June 2005, 05:03 AM #8
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    dont laugh......enquire at your nearest taxi base about lpg conversions.
    i would say that they are the experts on lpg by now....


    they should be able to tell you where to go for installations, tuning, maintenance, etc.

    the only thing to consider is availability of lpg in the outback....as you know some places dont even have ULP....
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