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  1. andyv8

    4-strokes obsolete?

    Slightly off topic, but here's a link to Ricardo's 2/4 stroke switching engine: http://www.ricardo.com/en-gb/Engineering-Consulting/Automotive-Expertise/Gasoline-engines/Downsizing2/2-4sight-Tab-Page/ I have no association with Ricardo!
  2. andyv8

    The future of the combustion engine-OP ED

    And the volume of batteries required: Gasoline ~9,100Wh/L LiIon ~320-250Wh/L And the extra weight/volume of batteries pushes up the vehicle size, which reduces the range etc etc.
  3. andyv8

    30 degree valves

    If valve seat wear was a problem in development, then changing 45deg seats to 30deg seats would increase the sealing area without having to change the inserts/head....
  4. andyv8

    The future of the combustion engine-OP ED

    Vehicle LiIon batteries (currently) 100-150Wh/Kg, Gasoline ~12,000Wh/Kg. It's going to take a lot of batteries to get a 400mile range....
  5. andyv8

    The future of the combustion engine-OP ED

    Toyota roadmap to sustainable mobility 2008. Renault Powertrain Strategy (Goldman Sachs) 2009. TNO report for the EU showing requirement to move to hybrids to meet EU CO2 legislation (Oct 2006). UK King reports for the All Party Parliamentary Motor Group. These are public domain. There are many...
  6. andyv8

    Flywheel speed fluctuation?

    Depends on the application, an engine in a chainsaw would have different idle vibration and torque fluctuation requirements to an engine in a motorbike.
  7. andyv8

    The future of the combustion engine-OP ED

    My 2 cents (as an infrequent poster) All passcar OEM's are looking to migrate to EV's in the long term, but the cost of high energy density battery storage will remain high for the foreseeable future and range anxiety from the consumer is likely to limit take up of these (by definition)...
  8. andyv8

    Cylinder Offset From Crank

    The Honda 2.2L Diesel is another engine with an offset crank to reduce noise and friction. One mathematical model by some chaps at Hyundai showed a reduction in friction at low engine speeds, but increased friction at higher engine speeds (cross-over point depends on offset). There have been...
  9. andyv8

    Research Engines

    Also FEV Germany. Otherwise most of the other normal engine consultancies will design you one: Mahle Powertrain, Integral Powertrain, Lotus Engineering, etc Andy
  10. andyv8

    electric supercharger

    It's a prototype - only 1 of 3 in existance, hence the size. (please note I'm not related to the company in any way....) Also many 100's of volts internally..... Definately wouldn't fancy the diagnostics/control strategy job myself!
  11. andyv8

    electric supercharger

    Have a look at a hybrid approach (albeit still in the concept stage) http://www.integralp.com/SuperGenArticles.aspx A supercharger using a turbo compressor wheel, 10:1 ratio drive (CVT) and electrical assist to improve the transient response of the compressor. Technically looks quite...
  12. andyv8

    4-VALVE HEAD - OPTIMUM PORT VELOCITY??

    NzRyan, Probably way too late (been away from the forum for a while), but the answer your looking for is probably 27mm diameter ports for a 4v head on the v6. Andy
  13. andyv8

    Injector flowbench test fluid

    Bosch use heptane
  14. andyv8

    4-VALVE HEAD - OPTIMUM PORT VELOCITY??

    I needed a 74mm throttle body on the V6 for best power - 65mm wasn't too bad, but still reduced power by ~6bhp @ 7000rpm. Found the flow bench info (25" water): Hope it's of some use. Bore = 87mm Stroke = 82.6mm Bare Cyl. Head with plasticine bell mouth Cylinder 1 - Forward Flow Lift (")...
  15. andyv8

    4-VALVE HEAD - OPTIMUM PORT VELOCITY??

    Jim, The 100/120 port velocities were calculated from mean piston speed. port vel = (bore^2/port_dia^2)*mean_piston_speed where port_dia is the equivalent dia of the combined 2 inlet ports. (all in mm) I'll try to dig out some flow bench data from the same heads.
  16. andyv8

    4-VALVE HEAD - OPTIMUM PORT VELOCITY??

    3.0L V6 4valve - max power at 6850: Mean inlet port speed = 100m/s Mean exhaust port speed = 120m/s Based upon average port diameter (exc. throat area which was CNC machined) Any higher and the powerband just went higher and torque dropped off, and vice versa. This was also shown to be optimum...
  17. andyv8

    Electronically Monitored Common Rail Fuel Injection

    A CR Diesel is very similar to a petrol engine, in that all of the injection events are controlled by a microprocessor (ECU) with inputs from cam/crank/temp/pressure sensors. Any variation in power supply to the ECU outside of allowable limits will essentially stop the ECU from functioning and...
  18. andyv8

    Engine throttle/resistance question

    Yster, Sounds like you might be trying to re-invent the wheel. There is a mathematical model of an engine/vehicle in the public domain. It is called ADVISOR (the last free version was 2002), runs under Matlab/Simulink and was developed to model hybrid cars by the US DOE. If you download a copy...
  19. andyv8

    Car exhaust pressure and gas flow measurement?

    WiringGuy - I've never bothered to isolate the exhaust gas from the sensor element - but then all of my work has only involved short duration dyno testing - I've never tried leaving one in place for extended periosd.
  20. andyv8

    Car exhaust pressure and gas flow measurement?

    A std Druck transducer will do the trick, just depends on what kit you've got to log it with. I've done all of my testing on dyno's, so used the dyno gear instead of stand-alone systems. I'm afraid I've never attempted to measure flow in the exhaust, but I think the best way would be to measure...

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