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  1. Flowczar

    basic plumbing for pulsed fuel injection

    Ron, Some pressure pulsations, especially when group firing, may be hard to get rid of. I posted last month with a problem we were having on a custom fuel rail set-up. We applied 4 dampers to the system to get things managed. Testing shall prove worthwhile. I would suggest returning from...
  2. Flowczar

    Laminar vs Orifice

    willeng, I have used both orifice and LFE benches. My biggest reason for switching to LFE was the data management. I can test faster, including time to test a "calibration" head, using the digital information directly input to pc provided by the LFE. There are weather...
  3. Flowczar

    Fuel Pressure fluctuations

    Eureka!! The installation of several (3) dampers on the system did the trick, in reviewing the data taken during a test we found the fluctuations reduced to under 4 psi, and then only during certain rpm ranges. Those ranges were compensated with extra fuel. The system was tested both with the...
  4. Flowczar

    Fuel Pressure fluctuations

    I likely should have been more clear in the initial mail. The fuel system works well when the engine is not running. Fuel comes from outside room via high volume, low pressure pump, through two filter assemblies, to measurement turbine, then to 1 gallon surge tank which feeds high pressure...
  5. Flowczar

    Fuel Pressure fluctuations

    We have made some headway. Pressure has been measured in 2 locations; before "y" fitting (replacing "t" of earlier testing), and one end of rail near connecting "loop" line. Dampers have been added to each rail, low volume type by Mototron. Pulses have decreased...
  6. Flowczar

    Fuel Pressure fluctuations

    Have turbocharged fuel injected engine on SF901 with very erratic pressures during run up, particularly worse within rpm ranges. Engine is fired sequentially and alternates rails. Have checked supply and system all the way to engine, great volume, even pressure is stable up to our decided...
  7. Flowczar

    stripped out Al. bolt holes

    I recommend the use of a product called a Time-Sert. www.timesert.com These have cured the problems associated with the poor strength of a Helicoil and other "cheap" thread repair options.
  8. Flowczar

    Favorite books

    Try the Bosch Automotive Handbook, it covers a very wide spectrum about cars and their systems. A new version was released recently. Good Luck!
  9. Flowczar

    Support chips for Bosch LSU4 O2 sensor

    Dana, It really depends on how wide a range you want to measure and the level of accuracy you require. I have found that sensor to be very inaccurate below 13.5 A/F and above 15.1 A/F for gasoline. These limitations of that sensor may not be what you want, or can live with. There are several...
  10. Flowczar

    Intake runner cover

    Louie, The inlet bells make a large difference in airflow at high rpm, especially when combined with a taper through portions of the inlet tract. A good general rule for taper is between 1 and 1.5 degrees per foot. Experimentation proves valuable when tuning and optimizing for higher prm...
  11. Flowczar

    Drive by wire throttle control - need to develop stand-alone controls

    Pitch the electronic throttle like Andy suggested. Since your ECU cannot handle the system, and I can't think of anything worse than a "stuck" throttle, evaluate the risks and make a sensible decision.
  12. Flowczar

    Port Epoxy

    There was a company called Cotronics, in New York I think, who make very high heat epoxies. I have used them for various ports, including exhaust, and would caution anyone considering this to be vary aware of their own responsibility. I don't believe epoxy to be a permanent fix, but for test...
  13. Flowczar

    cylinder pressure vs power

    Ben, I know of one way to do this, although the method you described sounds much more simple than this next path. Since the pressure will approach approximately 2500 psi for such a small increment of time, or degrees of crankshaft rotation, I'm unclear how a mechanical pressure guage would...

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