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  • Users: XXXLR8R
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  1. XXXLR8R

    Turbocharger inlet

    Normally, I would disagree with Jim Casey on the injected-water evaporation rate causing a significant decrease in the number of oxygen molecules transpiring the intake tract, but in this case - 15GPM water injection??? Sounds more like a sump-pump! Bet you'd hydro the cylinders and window...
  2. XXXLR8R

    sheet metal intake

    One-off sheetmetal intakes are much more economical to fabricate than one-off cast intakes ;~) Si Vis Pacem Para Bellum
  3. XXXLR8R

    Fuel stand-off - intake reversion - what are the causes?

    I believe they use 1.90" diameter head pipes almost a meter long... no mention of Pat's suggestion to run a pair of 2.25" pipes 40" long, though. V114 - IMO you've stacked the deck against yourself with your novel engine design. What did you discover in the combustion chamber design? Have you...
  4. XXXLR8R

    Intake Boost vs. Compressive Power Requirement

    Goodness no! 'Tis the other way 'round - 1st coloumn is compressor boost range, 2nd coloumn is additional TIP required over & above 1:1 ratio. Si Vis Pacem Para Bellum
  5. XXXLR8R

    Intake Boost vs. Compressive Power Requirement

    globi5 - yes, for specific turbochargers... i.e. Holset HE351 on 5.9L CTD: 0-5 psig boost = 3+ psig TIP 5-10 " " = 4+ " " 10-15 " " = 5+ " " 15-20 " " = 7+ " " 20-25 " " = 9+ " " 25-30 " " = 11+ " " 30-35 " " = 13+ " " 35-40 " " = 16+ "...
  6. XXXLR8R

    Intake Boost vs. Compressive Power Requirement

    Oh! - I was thinking more in terms of housing A/Rs and wheel trims... Si Vis Pacem Para Bellum
  7. XXXLR8R

    Intake Boost vs. Compressive Power Requirement

    globi5 - these are ubiquitous pressure readings from the post charge-air cooler intake tract and pre-turbine exhaust manifold on turbodiesels... confirmed many times over at every dyno session, dragstrip and sledpulling track. I agree that as a compressor's pumping performance rises, the...
  8. XXXLR8R

    Intake Boost vs. Compressive Power Requirement

    ... then how would you explain typical empirical TIP/boost ratio observations in the .95-1.15 range? (excepting ratios approaching 1.6 when you run the turbo off the edge of it's map) Si Vis Pacem Para Bellum
  9. XXXLR8R

    Intake Boost vs. Compressive Power Requirement

    Phil - are you saying that increasing boost (ALL else being equal!) in a given engine load situation will lower fuel consumption (raise BSFC)? globi5 - how do you surmise TIP is double compressor boost? Si Vis Pacem Para Bellum
  10. XXXLR8R

    Intake Boost vs. Compressive Power Requirement

    That was my instinctive opinion as well Pat; however, most in the diesel performance world have taken the opposite tack - insisting that more charge air = even more compression-stroke power requirement (causing power consumption to rise more quickly than potential power production). Wouldn't...
  11. XXXLR8R

    Intake Boost vs. Compressive Power Requirement

    In a compression-ignition Diesel cycle engine, what is the relationship between intake tract boost pressure and the required amount of crankshaft power to compress that amount of charge air in the cylinders? I.E. What would the penalty be to BSFC if a turbodiesel engine operated steady-state at...
  12. XXXLR8R

    Drive Pressure Extrapolation

    ...inefficient) power through the high 40s. Also, the better piston metallurgy and oil jet crown cooling of the HPCRs allow much higher EGTs - 1400*F indefinitely, short excursions to 1600*F and spikes over 1800*F. ... SHHH! In our world, there's no such thing as too much #2 :) Si Vis...
  13. XXXLR8R

    Intake Air Humidity

    NOW my cup runneth over... thanks Pat! I have yet to find a discussion or reference to injecting water into the pre-turbine exhaust tract of a turbocharged diesel engine, which is my point of interest. Especially with heavy fueling, I believe this scheme would be useful to accelerate low-RPM...
  14. XXXLR8R

    Intake Air Humidity

    LOL! Done to death? - not in my book... If I thought a site search would've been sufficient, I'd have executed one. Wasn't trying to make you do my homework, my good man - just asking for your analysis! Wisdom requires that we stand on the shoulders of those who've gone before us... Si...
  15. XXXLR8R

    Intake Air Humidity

    Pat, when would the heat of compression - and/or then combustion - initiate the phase change of water into steam? Even though the high ambient pressure kept the steam "saturated", wouldn't it's potential expansion energy still exist and add to the total available expansion pressure inside the...
  16. XXXLR8R

    Intake Air Humidity

    He's merely employing the mother tongue to issue a nuance... obviously he had to much to say for just one volume as it was. I have no reservations about Charles' ability to fathom the mysteries of the matter.... Si Vis Pacem Para Bellum
  17. XXXLR8R

    Intake Air Humidity

    Charles is a fine chap - as are you, my good man, for linking to that excellent tome! Si Vis Pacem Para Bellum
  18. XXXLR8R

    Drive Pressure Extrapolation

    ... hysteresis, that is.... Si Vis Pacem Para Bellum
  19. XXXLR8R

    Drive Pressure Extrapolation

    Assume no post-turbo exhaust (not necessary anyway). Don't figure any passive or active thermal management - just what's inherent in the denoted material; the difference in K-value between the cast iron manifold and SS tube headers is negligible, however the effective heat sink and therefore...
  20. XXXLR8R

    Drive Pressure Extrapolation

    ...- using a relatively quick-spooling Holset (HY35) turbo - to produce 30psig compressor boost. RPMs can be 2-3K with pre-turbo EGT in the 1-1.5K*F range. Holset is mounted directly to cast iron exhaust manifold. For simplicity, IF an identical amount of expansion energy was available at the...

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