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  • Users: Artsi
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  1. Artsi

    twin scroll turbine & 5-cylinder engine

    Hello My wife's son is building an Audi 5-cylinder 10-valve (petrol) turbo engine, 2144cc. The cylinder head will most likely retain stock size valves, but will receive a mild porting job by a professional (in order not to kill off-boost performance, porting job will not be done to support...
  2. Artsi

    4-stroke eng. exhaust pipe chamber (?)

    I spotted an additional exhaust runner resonance chamber on BMW 450cc motocross bike engine, see provided link. I have tried to wrap my head around the design function of said chamber with no results. This does not seem to be an anti-reversion chamber. I have however seen similar chambers on...
  3. Artsi

    Q: turbocharger sizing, diesel vs. gasser

    I have noticed turbochargers for diesel applications to have their turbine wheel diameter to be more generously sized as their petrol/gasser engine counterparts. Diameter increase of turbine wheel over compressor wheel varies from about 10% up to 30%. Gasser turbo's have somewhat equally sized...
  4. Artsi

    two small turbos better than one big turbo(?)

    I've been pondering whether two small turbochargers would offer any benefit over one large turbocharger. I've ploughded throught the net, and found some material suggesting that two small turbo's are a better way to go than one large turbo. Please have a quick peek at linked forum thread. I do...
  5. Artsi

    Turbocharger differences, diesel vs. petrol

    The very dilemma I have, is to gain a better realisation on differences between diesel engine turbocharger characteristics and petrol (gasoline) engine turbochargers. After some time consuming browsing over various turbo models, end result indicates differences in turbines. Diesel engine...
  6. Artsi

    looking for a good book on turbocharging

    Does anyone have commentary over this book: http://www.conceptsnrec.com/pdf/FundamentalsofTurbochargingBook.pdf I am a hobbyist, who is looking more detailed info than what "Corky Bell / Maximum Boost" can offer. Recommendations on any turbo books are welcome.
  7. Artsi

    turbo compressor flow numbers

    Hello I'd welcome a helping hand in converting unfamiliar turbocharger compressor air flow format. Please have a look here: http://image51.webshots.com/51/9/41/79/2513941790085019242mApMkI_fs.jpg I'd like to convert flow data into lbs/min, or kg/sec.
  8. Artsi

    fooling MAP sensor

    I would need to attempt converting so called 2bar MAP into 3bar version (absolute pressure). I have played with idea of making a very small expansion chamber between MAP and monitored pressure outlet. Path leading into this chamber would be of certain size, and a controlled bleed orifice would...
  9. Artsi

    founding user group for Engine Analyzer simulation software

    I am a happy user of Performance Trends Inc "Engine Analyzer Pro". I have been searching for this software specific user forum. I have not been lucky. Does this forum have any members with said program? Anyone interested in self created file sharing, and seeking solutions to engine modelling...
  10. Artsi

    clutch type ltd. slip diff. (function of)

    Can anyone please shed light into very essence of conventional clutch pack LSD? I have been wondering just what makes it tick. I was surprised to find all-metal clutch discs instead of discs with some type of friction surface on them when I disassembled one. Metal discs in question had an...
  11. Artsi

    exhaust headers - cyl. overscavenging ?

    Hello I've been wondering a procedure how to verify whether my engine has a presence of cylinder overscavenging. Engine in question is a 1504cc four cylinder, naturally aspirated, twin carburated (a pair of 40mm Dell'orto down draft), 304º cam seat to seat (= 260º at 0,050" valve lift)...

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