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  1. pbloore

    Rookie looking for advice with Labview for a Dynomometer

    I agree - it can definitely do what you want although you will almost certainly need signal conditioning unless you use a cRIO or cDAQ with modules that meet your requirements. I had to assemble a motor duynomometer in a very short space of time and LabVIEW proved invaluable. It was all done on...
  2. pbloore

    LPG on gasoline direct injection engines

    There have been a number of attempts at producing a liquid phase LPG (propane) injection system in Europe, but to my knowledge I don't know of a really successful one. Certainly the vast majority of systems currently available are all gas phase port injection. Ford did a liquid phase system on...
  3. pbloore

    LPG on gasoline direct injection engines

    Not too sure I agree that GDI's spreading quickly. Although there is a lot of theoretical promise, there are quite a few practical hurdles. With regard to injecting liquid LPG through a GDI injector I suspect that the lack of lubricity would be one big problem followed by ice formation. No...
  4. pbloore

    Some propane conversion questions

    I would agree with franzh based on personal experience. My series I Discovery which had a relatively uncomplicated gasoline PFi (OBD 1 capable) got about 14 (11.7 US) MPG. On a closed loop venturi system it returned 13 (10.8 US) MPG, but when fitted with a relatively simple closed loop...
  5. pbloore

    LPG optimisation

    As Franzh has said there are a lot of small motorbike/moped conversions in the third world mainly using equipment from Italian suppliers I think, certainly BRC supply kits to India. To the best of my knowledge they do not supply any kits in the UK
  6. pbloore

    Throttleless propane, succesful test and idle discussion

    I don't think the injectors I'm using are designed to take more than about 4 bar in total. I know there are other injectors around but there is usually a limit of around 5 bar even then. You could try the two injectors per cylinder approach and drop the line pressure though. With respect to...
  7. pbloore

    Throttleless propane, succesful test and idle discussion

    I haven't managed to find any detailed specifications of the vapour injectors I'm using but according to the installer notes there are two LPG vapourisers - a 1.2 and a 1.5 bar - and two injectors with different flow rates. The 1.5 bar vapouriser with four of the higher flow injectors is useable...
  8. pbloore

    Throttleless propane, succesful test and idle discussion

    I'm using a vapour phase injection system on my 4.6l V8. While it's a fairly mildly tuned engine, the injectors work very well. I'll see if I can look the specs up tomorrow, but they're Keihin injectors and from memory they're low impedance (peak and hold type) and rated up to about...
  9. pbloore

    Throttleless propane, succesful test and idle discussion

    For safety I would use at least a tank solenoid to shut down the fuel line if say the ignition is killed. From an injector point of view I would echo Franz's comments - I don't think they will survive too long - apart from the pressure, the lubricity of liquid propane is significantly worse...
  10. pbloore

    Throttleless propane, succesful test and idle discussion

    Just read your first note properly and realised you're using port injection!. Out of curiosity what injectors are you using, and will they cover your min to max fuel demands or are you using two injectors per port. Paul :-)
  11. pbloore

    Throttleless propane, succesful test and idle discussion

    Great Stuff!. I keep thinking there's got to be a better way to run a spark ignition engine. With respect to your misfire you might find a benefit from using individual injectors although there may be issues with the range of fuel flow available to cover idle to full power. It would be...
  12. pbloore

    Electro-Mechanical Valving

    I think Lotus have a system giving total control of the valvetrain if hat's any help to you.
  13. pbloore

    Propane Mixer Requirements

    I don't know about the availability in the US, but if you're looking to develop an engine for racing you might be better looking at an injection system. It avoids the need for a venturi which restricts the airflow. I think Impco have a tie up with an Italien company BRC who make injection...
  14. pbloore

    Diesel Power Chips

    I'm not a diesel expert, but I do know that there are a lot more problems with diesel calibrations with respect to the torque developed. A lot of calibrations have some from of torque limiting built in to give the gearbox/powertrain more chance of surviving, and I suspect that the power chips...
  15. pbloore

    RESIN SEALANT FOR CYLINDER HEAD

    I've heard of an American product that's designed to seal coolant leaks in blocks and heads. I'll see if I can find the deatils tonight.
  16. pbloore

    Propane Ignition Characteristics

    Thanks for the suggestion. I have not found much information around regarding optimising spark plugs for LPG operation - the difficulty as well is that the engine can run either gasoline or LPG which makes things tricky. I've now changed vehicles and have just had a sequential vapour phase...
  17. pbloore

    Which is the best type of propane injection?

    I should have also added that the reason the mapped system is worth considering here, is that the tax system in the UK severely distorts the fuel cost. LPG (Propane mainly) is less than half the cost of diesel so can (potentially) give fuel cost savings along with a useful increase in power...
  18. pbloore

    Which is the best type of propane injection?

    The thing I love about American vehicles is that they seem to have no concept of overkill. A large SUV in the UK would probably have a V6 turboDiesel of about 3l! - 7.3l, two superchargers and one turbo charger sounds rather fun. In the UK there are two types of propane injection kits for...
  19. pbloore

    24-volt battery vehicles?

    As Geg said, Trucks (Goods Vehicles) often use a 24V system but no cars that I can think of (with the possible exception of some of the big 'trucks' used in the USA). 42V systems are one of the big pushes for the future for efficiency and weight saving reasons, but there are a number of...
  20. pbloore

    Mass Air Flow (MAF) Signal Filtering for an Aftermarket ECU

    You could try digital filtering - there are a number of algorithms commonly used (never tried them mind). When I've previously looked at this type of signal I've used a simple moving average implemented in software with a sampling rate an order of faster than the baseline fluctation.

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