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Topic: LPG Conversions
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02/11/2013 at 1:12pm
Location: Rushden Northants Outfit: Mercedes 614D Conversion
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Regarding burnt valves, our Discovery had an LPG system fitted in 2005, but we have no previous history of it before we bought it with a knackered engine in 2009.
It took a while to get the story out of the seller, but it turned out that at some point the engine had dropped a valve and nuked the engine. He then paid a fair wodge of money to have another lump fitted, which was a right mess.
We bought it for £1900 in 2009 with a known bad engine.
It turned out to be a 4.6 Range Rover engine, and was thoroughly bodged, so we got a new short engine and rebuilt the whole thing, and have covered 60,000 miles since then with absolutely no problems.
We had the heads off after 45000 miles due to a water loss which we put down to bad quality gaskets, we fitted Reintz gaskets and it has been fine to date.
Getting to the point, the valves were ground in when we did the engine rebuild, they didn't need the seats refacing. 45000 miles later, they still only needed grinding in, and that's all we did.
It may be different for other cars, ours is a 1999 car, built in Nov 98, so possibly a bit old tech.
You must run a decent quality oil in the engine, we use a semi-synthetic diesel 10W-40 oil and have done since the rebuild.
You should also use decent quality spark plugs, platinum contact types are very good.
The other thing that hasn't been mentioned is the extended oil life that you get with LPG. There are far less combustion by-products with LPG than with petrol, so our engine oil stays clear for nearly 10000 miles, and even when we change it, it is still semi-clear on the dipstick.
You exhaust will last longer as well, less corrosion in the exhaust makes a big difference to the life of the system.
Sorry for the long post, but I thought I'd try and go into some detail.
Peter
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