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...
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...
Goodness no!
'Tis the other way 'round - 1st coloumn is compressor boost range, 2nd coloumn is additional TIP required over & above 1:1 ratio.
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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...
... 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)
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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?
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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...
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...
Sorry, I mis-posted above... turbo is HE351, not HY35!
Correct about the boost limitations of the older turbo - the new Holsets have a pretty good map up to the high 30s, and still make plenty (if inefficient) power through the high 40s. Also, the better piston metallurgy and oil jet crown...
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...
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...
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...
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....
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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...
I need some SOTP engineering on this one.
How much less would the drive pressure be on a turbocharger mounted 36" away from the exhaust ports as opposed to the same one mounted within 12" of the exhaust ports?
We observe 35psig drive pressure (TIP) on a Cummins 5.9L inline 6 cylinder diesel...
