I was merely responding to you're 'it might just be mine' comment. It wasn't an I'm alright jack response, as iam not an arsehole
Which is better 4.4 or the supercharged 4.2 V8
- Thread starter squaresausage
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I was merely responding to you're 'it might just be mine' comment. It wasn't an I'm alright jack response, as iam not an arsehole
myfirstl322
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Ok, back up, i never called you an @rsehole paul.
squaresausage
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Are there any issues with the supercharged engine run on lpg?
Datatek
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If, as I think, it's the Jag engine, they are not good on LPG, valve problems.
squaresausage
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So am I best to stick to my 4.4 ? I found a cracking 4.2 for sale in Edinburgh but with out lpg.
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if you want LPG, stick with the 4.4....
wil2813
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as saint says above
squaresausage
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What are the issues? Shame as the car I found was a very nice 35 year anniversary edition.
stevebrookman
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Valve Seat regression due to the dry nature of the LPG...
Petrol cools and minor-lly lubes the Valves Seats as the fuel is injected, keeping them clean, cool and in good condition.
LPG is a comparatively dry media and as such doesn't cool, lube or clean the valves and seats as it is inducted into the engine.
This can lead to the valve seats wearing away or regressing which can mean a rebuild over time.
The BMW engine (along with the Rover V8's) used a hardend valve seat and valve edges and as such can stand up to the higher heat due to lack of cooling effect and also lack of lube much better.
Some BMW/Rover engines have a Flashlube system fitted which injects a tiny amount of oil along with the LPG to make the media 'wetter' in order to further prevent regression, but on the Jag engines this I believe has met with limited success...
Petrol cools and minor-lly lubes the Valves Seats as the fuel is injected, keeping them clean, cool and in good condition.
LPG is a comparatively dry media and as such doesn't cool, lube or clean the valves and seats as it is inducted into the engine.
This can lead to the valve seats wearing away or regressing which can mean a rebuild over time.
The BMW engine (along with the Rover V8's) used a hardend valve seat and valve edges and as such can stand up to the higher heat due to lack of cooling effect and also lack of lube much better.
Some BMW/Rover engines have a Flashlube system fitted which injects a tiny amount of oil along with the LPG to make the media 'wetter' in order to further prevent regression, but on the Jag engines this I believe has met with limited success...
squaresausage
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Yes my LPG installer has warned me off the jag engine as he said it not designed with LPG in mind and can cause all sorts of problems. Which is rubbish as I had found a real cracker I wanted to convert. Boooooooo
