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  • Users: aorangi
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  1. aorangi

    Best bore-stroke ratio?

    Of course if you keep the same stroke. But then you have a bigger displacement engine !
  2. aorangi

    Best bore-stroke ratio?

    No, it won't because actually there's less friction area on the cylinder walls with an increased bore for the same displacement. It's just a simple geometry question. A 5-liter V8 with 99 mm bore and 81 mm stroke has a what I call a "cylinder area" (cylinder circumference x stroke x number of...
  3. aorangi

    Best bore-stroke ratio?

    Higheta, have a look here, I think you'll find a comprehensive answer : http://www.auto-innovations.com/site/document/power2.html Cheers Aorangi
  4. aorangi

    maximum piston speed?

    At 19'000 rpm, the maximum piston acceleration in a BMW P83 of formula 1 is 10'000 g . http://scarbsf1.com/BMW_P83/index.html http://forums.atlasf1.com/showthread.php?s=&threadid=61653%20http://scarbsf1.com/BMW_P83/index.html Cheers Aorangi
  5. aorangi

    maximum piston speed?

    Formula 1 engines are actually around 26 m/s mean piston speed and 41 m/s maximum piston velocity at redline.
  6. aorangi

    Supercharger vs. Turbocharger

    Extremely comprehensive information about every concepts of supercharging, turbocharging and turbocompounding here: http://www.auto-innovations.com/document2/doc-engine.html There's a small charge, but it's worth it. Cheers Aorangi
  7. aorangi

    running turbine directly to crank

    Beautiful CAD pics of the R-3350 here: http://www.enginehistory.org/vicenzi.htm It was also proppelling the the DC7s Vovo and Scania produce turbocompound truck's engines. Turbocompounding history here: http://www.histomobile.com/histomob/tech/2/113.htm Cheers Aorangi
  8. aorangi

    Turbine inlet temperature, air-fuel ratio and catalytic converters

    Thanks a lot to you also, Greg, I really appreciate. Cheers Aorangi
  9. aorangi

    Turbine inlet temperature, air-fuel ratio and catalytic converters

    Thanks a lot, SBBlue, it definitely helps. That's what I suspected at first but my knowledge about catalytic converters is really poor and I was assured it cannot by so be a knowledgable friend. Also page 522 of the Bosch Automotive Handbook states that with a 3-way catalytic converter...
  10. aorangi

    Turbine inlet temperature, air-fuel ratio and catalytic converters

    On the BorgWarner Turbo systems, which seems to provide outstanding and up-to-date info, we find this : http://www.3k-warner.de/en/products/t_temp.asp "The air ratio lambda at the rated output point is currently about lambda=0.75–0.85 since a portion of the fuel is used to cool the inside...
  11. aorangi

    Diesels at Le Mans

    Yes, the famous Napier Nomad (the Lion was a pre-war spark ignited W12 with 3 banks of 4 cylinders). It's been talked about on thread thread71-63511 and thread71-48738 in which the gas generator principle was also mentioned. I think the gas generator concept would have been more suitable for...
  12. aorangi

    Diesels at Le Mans

    PJGD, Sorry I hadn't seen this interesting thread before ! Your paragraph... "My view is that there is still room for growth in divided chamber combustion systems if higher engine speeds are believed to be the way to go; the piston is much lighter, and the combustion system has more...
  13. aorangi

    Throttle bodiless Spark Ignition Gasoline Engine?

    Yes Kasey. More info here: http://www.histomobile.com/histomob/tech/2/118.htm Cheers Aorangi
  14. aorangi

    BMW Valvetronic and Audi FSI combined

    The articles I gave the links in my post of Mar 31 are available in English. http://www.histomobile.com/histomob/tech/2/123.htm Cheers Aorangi
  15. aorangi

    RESIN SEALANT FOR CYLINDER HEAD

    I tested the Bar's Leaks Cooling System Sealer. http://shop.store.yahoo.com/rodi/radiatoradd.html On a car with a slight external coolant leak at the head gasket it worked fine and never gave anymore troubles for several years. The engine never overheated neither, even at full load and speed...
  16. aorangi

    May "Fireball"

    Thank you very much , Marquis for your extremely interesting post about your first hand experience with the Jaguar V12 and the Fireball combustion chamber. You don't have to apology about the short delay, it was well worth the wait ! I was just impatient to know whether you saw that thread...
  17. aorangi

    intercooling and engine temperature

    "aorangi, the thermal load changes if you inject more fuel...right? and I have a feeling it will increase more than the sensible heat you've manage to remove by cooling the air down." It depends how much more fuel you inject... Cheers Aorangi
  18. aorangi

    May "Fireball"

    Thanks, Greg. You're right the turbulence was very high, but according to the test data of a Passat prototype head in the papers written by Michael May (I. Mech. E. C204/79 & C97/79 + SAE 790386 / 1979) the NOx emissions were decreased by a factor 3, the CO by 4 and the HC were roughly the same...
  19. aorangi

    May "Fireball"

    Does any one know the reason why the fantastic May "Fireball" combustion chamber retrofitted by Jaguar to its V12 was abandoned? http://www.jagweb.com/jagworld/v12-engine/page4.html Cheers Aorangi
  20. aorangi

    intercooling and engine temperature

    Coolant temperature is a cooling system problem. Perhaps a malfunctioning thermostat, clogged radiator, defective water pump or fan thermocontact. An Intercooler will reduce the whole thermodynamic cycle temperatures and engine thermal load as long as you still inject the same amount of fuel...

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