Problems with valves with auto lpg/cng

[CarloAV]

I open this poll to find out who of you has or has not had any problems to the valves using a car, cng/lpg (later transformed to the purchase). In case you have not had any problems what measures adopted. Thanks

[nerone]

hi CarloAv I work in a workshop authorised fiat and cars with an lpg system, I see all the days while the cng never seen one because they are in sardinia and here there is no the cng. the problems pi? there are frequent locking of the injectors and of the lung ...due to an oily substance that becomes a sort of caramel brown going to mess the whole system. to solve the problem usually wash everything by revising the lung with a kit aposito that contains everything, diaphragm and seals including,cleaning of the injectors with ultrasonic mode and replace the filter . sometimes the injectors nn are saved, and must be replaced,the cost is 60 euro each. with regard to the valves for me ? that just happened on the nissan note with lpg landi renzo installed from the factory . burnt valves and valve seats destroyed ... the car had about 80000 km. with the repair? the valve seats and the valves have been installed to a different material ... I don't know to tell you that material.... me ? been told apositamente for the car with the gas system. I can give you another information. loading the chassis of a fiat on the spare parts catalog original , the code of the valves change on a vehicle with a gas system, means that the fiat that come from the factory with the gas plant have the valves different from the fiat identical without the plant.I hope I helped you regards

[CarloAV]

Thanks for the clarification, so in your case the valves in the lpg systems represent a problem that rarely occurs right?

[passione motori]

Hello all, the problem arises from the temperature caused by the lpg pi? high of the gasoline, the valve seats have been designed to use fuel to unleaded fuel, many automotive manufacturers decided to manoeuvre the business of providing cars with lpg system considering just that the cars were compatible with this fuel, but not perfectly suitable, the solution lies in replacing valve seats and new valves are of quality? similar to or greater than original equipment. A few engines do not require this update saw the quality? of the materials used.

[gick]

I agree with the passion for engines, Many manufacturers do not take account of how the Gpl works inside the engine, I work in a workshop authorised Fiat and the warranty work on the cars to lpg which are fitted with the system have been numerous, to dirt on the injectors, fortunately not yet to the valves for? with the injectors becomes rubber, to fit a lpg-engine does not ? 't be easy, in addition to the fact that when they begin to have the mileage that the valves begin to lose a p? with the cold I'm always in the workshop

[blackwolf76]

In my part to turn a lot of panda 4x4 old series, which is the version with the Fire engine 1000 carburetor, the greater equipped with the lpg system. I can assure you that on the old motors do not have any problem of valves and seats.

On some I mounted the engine 1.2 of the point, and I confirm that even with this change, have had no such problems. Probably the whole ? also connected to the anti-pollution systems, and various catalysts that raise combustion temperatures in a very pi? high compared to the old systems.

[CarloAV]

Then I assume that removing the cat or replacing them with cat less blockers is partly addresses the problem right?

[MultiBravo]

According to me depends in a decisive way by the quality? of the materials used nowadays.. does not explain how engines old and not designed for lpg the they digest better car today with system mounted in the factory.. mechanical problems of wear unknown a dozen years ago, but now they are returning (valves and seats, out of roundness cylinders..) all caused by materials calculated x last the right, a little..

[gick]

I, instead, on those engines in them, lpg system indirect injection since put the injector directly to the suction of a butterfly sometimes I had to drill or cut the seat of the air to the minimum otherwise they died out

[nerone]

fully agree with multibravo