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About ScottC

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  • Lexus Model
    LS 430
  • Year of Lexus
  • UK/Ireland Location
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    General Automotive
    Computers & Electronics

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  1. Hi Maybe of interest. Ford were making cars 13 years ago with LPG engines which started from cold on LPG and then ran on LPG, they didn't have a petrol tank. Scott
  2. No that is completely wrong........LS460 conversion uses direct injection system for the LPG. No vapouriser is needed to heat the LPG as on an indirect injection set up, the gas is injected straight into the combustion chamber. So it starts and runs from cold on LPG. Scott
  3. Yes On the hottest days of the summer my car is running on gas within a few hundred yards. No reason to think it wouldn't run immediately on LPG if the electronics allowed it to. What system was yours? I have a BRC system in mine. Scott
  4. Hi again. There is a tutorial here :- You are never more than a few mouse clicks away from a Lexus tutorial..... Scott
  5. Not wishing to throw a spanner in the works here, but a copper or silver cored plug has far better thermal conductivity and much lower electrical resistance than a platinum or iridium plug. So it should produce a better spark and wick more of the heat away from the combustion chamber. I went through all this a bit back when I got my LPG LS430 and I found quite a number of references to platinum/iridium plugs being created to meet the demands of extended service life in modern cars, rather than them being any better than 'traditional' plugs. I also found a number of references to platinum/iridium plugs being difficult/impossible to get out after extended mileages, so maybe a case there for using a plug that needs to be changed more frequently before it has a chance to get stuck. Scott Material Thermal Conductivity W/(m•K) Electrical Conductivity MS/m Silver 407 66 Copper 384 57 Gold 310 45 Iridium 147 18 Platinum 70 10 Nickel 59 10
  6. Yes, however a quick 'google' reveals that the cylinder head temperature is significantly higher with LPG due to the quicker burn time of the gas. Running on petrol the cylinder temperature is reduced by the cooling effects of the petrol as it is injected. You don't get this with LPG as it is converted to a vapour in the vapouriser before it is injected. So it seems that the temperature around the spark plug will be much higher whilst the engine is running on LPG. Although LPG produces less total heat ( it has a lower calorific value) that heat is released in a shorter time. The reason for this is that LPG is a 'perfect' gas at ordinary atmospheric temperatures whilst petrol vapour is liquid that has been forced to vapourise. The cooling effect of liquid petrol droplets is not present with LPG and the total heat is released more quickly. A greater heat 'spike' is the result. The engine will run slightly hotter, although the difference may not be large enough to show on the temperature gauge. Only the cylinder head temperature (CHT) will increase significantly (although not enough to cause any problems). Most cars do not have a device for monitoring CHT (unlike aircraft). A typical car temp. gauge measures coolant temperature only, which is much more of a general picture. Leading on from that, it follows that an engine running on LPG will ' warm up ' more quickly than it would on petrol. Petrol consumption is extremely high when the engine is cold as a choke or excess fuel device (both giving a very rich mixture) must be used. LPG scores over petrol again, as this is not necessary. LPG does not need an artificially rich mixture and the engine warms (to its normal operating temperature, where it is most efficient) even more quickly as a result. LPG has a high octane rating (it tends to give less 'knock') and is more easily and thoroughly mixed with air. One of the results of this can be a quieter and smoother running engine. Scott
  7. Hi The hub might take more than an hour to change, one of mine was seized solid into the suspension arm due to corrosion between the steel bearing and the aluminium arm. It came out eventually! Good luck. Scott
  8. Jury seems to be out on this but LPG does burn a bit hotter than petrol so may be a bit harder on the spark plugs. If you do buy the LPG certified ones remember to put a bit of snake oil on the threads before you fit them. Scott
  9. Hi Will When I went to look at my car the owner had run the battery flat by leaving the radio on whilst hoovering and cleaning it. A breakdown service had jump started it but connected the leads wrong and the car was quite poorly when we got there, wouldn't start at all but random bits still worked. Car was trailered to local garage who found a blown fuse, it took them a few days as it wasn't at all easy to locate. They had to order a replacement in as it was a special one. This is what the owner told us when we went back a week later to buy the there may be a fuse somewhere you have overlooked? If the car won't run over 2500 rpm and the OBD shows a fault code for the throttle actuator mechanism maybe you should sort that out first as the 2 things are probably related. Good luck Scott
  10. Taming the Beast...……..
  11. Hi Piers Yes £500+ seems to be a starting point for professional rust treatment of a large car. I hadn't heard of Bilt Hamber so thanks for that, from their website they do a car underbody protection kit 2 x dynax-s50 750ml 1 x dynax-UB 750ml 1 x dynax-UC 750ml 1 x surfex HD 1L which might be the way to go for me.
  12. Hi Any advise on treating rust on the underside of my LS430. Has anyone used a Dinitrol treatment centre, or is DIY an option? Scott
  13. HI Robert I didn't know that the 2005 GS300 has this, my 2005 LS430 uses data from the ABS sensors to detect tyre pressure changes and I assumed the GS was the same. I will pass this on. Scott
  14. Hi A friends 2005 GS300 is displaying the tire warning symbol and a 'system check' symbol. A previous tire warning was accompanied with a low pressure warning and the problem was indeed a deflated tyre. Handbook says the car can be driven and describes the fault as a problem with the electronics that monitor the tyre pressures, rather than a problem with tyre pressures. Any ideas? Scott