42, The meaning of life
Join Date: Jul 2009
Location: Melbourne, Australia
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I have been trying to research this further. I spoke to a LPG installer in England (F1 Automotive) who was recommended in a different thread. He said that he has installed LPG conversions on around 50 - 60 M62 equipped vehicles over a period of about 7 years using the Prins vapour injector kit. He wasn't aware of any of those converted engines having premature valve seat/guide wear issues, and he didn't feel that a flash lube system was required, although it would help extend the valve life.
I can understand that the liquid injector kits may improve the performance of the overall system by chilling the air in the intake and thereby providing better expansion characteristics, but I'd really appreciate any feedback from people that have direct experience or expertise on this issue.
At this point in time I am inclined to lean towards the advice from the team at F1 Automotive, purely because they have spent a decent amount of time perfecting the implementation of the vapour injectors and LPG related equipment.
As far as the payback period goes on the gas conversion, I currently drive a 1996 GMH Commodore (5.0l V8) which has been on gas since I purchased it 10 years ago, it has done 385,000km (417,000km in total) in that time and has never had any repairs performed on the motor other than regular services. I figure that the conversion ($2000) which is based on the old mixer style, has paid for itself roughly 10 - 12 times over, which nearly offsets the total purchase price of the car in the first place. Obviously this style of car ownership isn't the same as everyone elses, but while a car is still comfortable, reliable and practical, I don't see any real need to change it over.