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  • Users: rdd48856
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  1. rdd48856

    Increasing Comfort

    I bought a Renault GrandModus without doing a test drive and I’m very unpleased with its comfort in good roads. I'm talking about feeling all the small bumps and holes, which could be very annoying in Highway driving. I already changed my wheels from 16” to 15”, and my tires from 185/55 R16...
  2. rdd48856

    Compression ratio x compression pressure

    What is the reason why with a compression ratio of 1:8,5 you should get between 11 and 13 bar of compression pressure? You shouldn't only multiply compression ratio times the atmospheric pressure? Thank you.
  3. rdd48856

    More questions about LPG

    Well I have several LPG questions: 1) On a French study (CFBP) it was found that on some gaseous sequential multiport injections systems CO emissions were higher while on LPG than on gasoline. They justified this as a deliberate strategy to protect valves by richening the mixture on...
  4. rdd48856

    Problems concerning LPG

    As some of you already know I’m moderating the only LPG forum in Portuguese. There are a few recurrent problems arising on lpg bi-fuel cars. 1)Damage head gaskets. Can this be caused by know higher LPG burning temperature? How to avoid this? If thermostat temperature is lowered, the heat...
  5. rdd48856

    LPG on a air cooled engine(Porsche 911S)

    I was asked about this and I found 3 problems: 1)How to make the vaporizer work(there's no heat water) 2)Where to place the LPG tank(the engine is at the back and is forbiden to install it at the front) 3)How to stop gasoline injection, because it is mechanical(Bosch K-Jetronic) (you can see it...
  6. rdd48856

    spark plugs

    LPG burns hotter than gasoline, so do you need a higher grade or a lower grade spark? I read both advices so I'm a little bit confuse.
  7. rdd48856

    LPG on gasoline direct injection engines

    Direct injection is spreading quickly as environmental legislation is more severe. What future to bi-fuel(LPG and gasoline) cars? Would it be possible to use the same injector to one or another fuel(both on liquid fase, of course)? Any ideas? Thanks!
  8. rdd48856

    Time Advance Processor for LPG(Propane)

    I would like to know if there is any advantage in using this devices on modern cars(with knock sensors). I found controversial answers to this simple question. LPG Kit installers told me there aren't any advantages but they can't say why. It is very hard to understand their language...they talk...

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