LPG / petrol engines

nahnotme

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Sep 23, 2007
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After living full time in a converted coach, with a 3.6l diesel engine I have decided to upgrade and have found a coachman catalina with a 6 litre petrol engine that has been converted to LPG. the seller states that the petrol system can no longer be used and it runs fine on the gas.
I have been advised by a mechanic not to even bother going to have a look at it as it will be very unreliable.
Apart from having to keep an eye on the gauge and keeping it topped up I cant see what the problem is ? He also states that financially it will cost the same to feed as the one Ive got.
It is perfect for what I need and it looks to me a REAL bargain.
Your thoughts would be appreciated....quick
thanks
 

scotjimland

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Jul 25, 2007
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OK Quick answer..

listen to your mechanic ..

then ask yourself why is it a REAL bargain... the seller wants rid of it quickly .. why ?
 

lugnutt

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hi...for what reason is the petrol system not working? if it runs on lpg surely it can run on petrol or has the tank been removed to make room for lpg tank?
 
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nahnotme

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Sep 23, 2007
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He just says that he thinks that there may be rust in the petrol tank and it just needs some time spending on it ?
Could my mechanic be putting me off as an LPG engine is a specialist garage thing ?
I have spend 3 grand getting the coach conversion I have repaired and am back there now, maybe I'll be missed if I get something less trouble ?
I thought an LPG system had to be started with petrol then switched over ?
 

Road Runner

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I have a fuelling issue with my RV at present (lazy pump in the petrol tank we think) but it starts on petrol then chops over to gas very quickly so no problem although my get the petrol sided fixed.

If you went to LPG maybe you would need another mechanic and your guy would loose his golden goose?
 

lugnutt

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John on my rv starting on petrol i must not touch the accelerator at all ,but on lpg i have to pump it does yours have this trait?
 

Road Runner

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Mine is the new sequential system. I do have a petrol problem. Can start my bus from cold with LPG this system but runs lumpy for a bit.
 
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lugnutt

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mine can start from could but prone to backfire as it is useing lpg liquid untill the regulator is warmed up by warm water from the engine to mix it to gas
 

Terry

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Hi I can only speak as a car owner but my system starts on petrol and switches to gas after about 1 min.Be aware that using gas burns hotter and burns the heads/valve gear after prolonged use killing the engine.Must say that with the mileage done in most m/h it will not be a problem for a long time say 80,000-100,000 miles :ROFLMAO:All the car owners(mechanics)I speak to are aware of it but all choose to bury there heads in the sand :ROFLMAO::ROFLMAO:
terry
EDIT not a problem on a petrol engined 4 x 4 where engines are 10 a penny , but on a RV ???????????
 
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American Dream

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Be aware that using gas burns hotter and burns the heads/valve gear after prolonged use killing the engine.
I ordered a Flashlube kit to replace the missing additives that can cause valve recession on long running lpg engines.

I use octane booster anyway on the petrol side which also has these additives.

Just playing it safe.
 
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Terry

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I ordered a Flashlube kit to replace the missing additives that can cause valve recession on long running lpg engines.

I use octane booster anyway on the petrol side which also has these additives.

Just playing it safe.
Hi Steve if these all work why have Volvo etc, stopped making lpg cars :ROFLMAO:
terry
 

American Dream

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Hiya Terry,

I was speaking to a colleague this morning who used to work at a volvo franchise.

Do they use these additives?He seemed to think not.

The problem is the cost of these somewhat negates the advantage of cheaper fuel cost.:Sad:

I would have thought in this day and age with metallurgy advances, they could develop valve seats that would withstand the temperatures.
 
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Terry

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Hi Steve :ROFLMAO: me too but apparently not :ROFLMAO: cheaper to stop making them :ROFLMAO:BTW my mate says look at the head after only a few thousand, says it looks like it has had a blowtorch on it,dry as a bone :ROFLMAO::ROFLMAO:
terry
 

American Dream

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Just out of interest, do you know of any rotary engines (Mazda etc) that have been converted to lpg?

Remember the rotor tips used to wear badly on early ones.
 
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Road Runner

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Well both my Jeep and Bus run on LPG through sequential system from Romano and if my valves go I will be straight onto them as they say its a myth.

Why are the car manufacturer masking LPG car like Vauxhall and now Proton have just added an LPG car to their range?
 
Nov 22, 2007
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Petrol/gas conversion

Hi

I done some calculations and based on current Fuel Prices plus the cost of conversion I estimate the Break-even to be ALMOST 23.000 MILES?.

My 15 Year Old R-V has only done 62K? So at that rate it will be more than 5years. before you see some Money back?.

Its only going to be "profitable" if a previous owner does the conversion, and then you will probably pay a premium over a Straight "gas" coach anyway?

Pete
 
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