Air to Turbo

[PM7088@...]

Turbo Diesels are by nature very "Air Rich", in that respect they have very
different needs than a gas engine. Putting in 25% more air will yield nothing.
To get more power is simple, just add fuel. Different injectors {or timing on
computer controlled engines) is how you do it. Want economy? Reduce the fuel
input.
How fast you want to go? = How much fuel you want to burn?

Pete


-------------- Original message ----------------------
From: Pete Masterson
> While I worked at NASA Ames Research Center, I learned that "fluid
> dynamics" often applies very directly to air flow. So, observations
> about hydrodynamics very often directly applies.
>
> Air for combustion is best obtained from the coolest source. On my DD
> Series 60 (and I think the 8v92s) there is an "air charge cooler"
> that is used to cool the air after it passes through the turbocharger
> and before it goes into the combustion chamber. Cooling the air makes
> it denser. Compressing air makes it hotter.
>
> I've heard a fair amount of anecdotal reports of improved 3208
> performance by routing air intake to the front of the engine
> compartment, away from the behind the radiator. (Other FC owners with
> experience on this point would be far more help.) With a naturally
> aspirated front engine, a proper shape of the air inlet can result in
> "ram air" that gives a slight power boost. Ram air is much less of
> an issue with a turbo charger, but would have a minor positive impact.
>
> On the PT models, getting air from outside the engine compartment is
> ideal. I believe my coach has its combustion air inlet on the curb
> side above the large grate side access door. There is no scoop or
> other effort to increase air flow -- but my DD Series 60 shows no
> signs of lacking sufficient air.
>
> I've seen some sort of scoop at the top rear on some coaches with the
> 8v92. The problem is that if it faces forward (for the ram air
> effect) it tends to pick up undesirable debris. I think the main
> effort is to ensure that the engine has good access to fresh air from
> outside the engine compartment. Since the 8v92 (and 6v92) are all
> turbocharged, the ram air effect isn't especially important.
> Sufficient cross section and control of air-movement restrictions for
> what ever reason are important for ideal combustion.
>
> FWIW, I often wonder how the generator manages to work with its very
> restricted source of combustion air inside the sound compartment.
> (Indeed, my generator starts putting out tons of black smoke when the
> air cleaner is only a little dirty...)
>
> Pete Masterson
> '95 Blue Bird Wanderlodge WBDA 42
> El Sobrante CA
> aeonix1@...
>
>
>
> On Jun 13, 2008, at 7:15 AM, Gregory OConnor wrote:
>
> > Bill, like in our topic of door wind noise, turbulance of air causes
> > restriction of flow.Wind noise is a visual result of air
> > turbulance??? I removed a big acordian scoop from a tractor that
> > collected cleaner air from out of the hot engine compartment and
> > reduced the black smoke immediatly????? I learned that there was no
> > restriction in the pipe but my thinking is the air restricted its
> > self. you may notice corrigated 2 foot drain pipes stay cleaner than
> > smooth and bigger concrete pipe. the turbulant flow of water
> > restricts flow and uses the energy to work up otherwise settling
> > silt. I am sure air flow has major diffs than hydrodynamics??? But
> > turbulance causes heat and I wonder if 'just heated air' has
> > density lost??
> >
> > I am not sure 'hot air 'is that much less dence than cooler air. I
> > understood the advantage to be 'air just cooled'.?????
> >
> > Now DavidB and PeteM can add some math to convince you to look for
> > another project... Dig a pit and wait for the WhatsHisName's kids.
> > it's more fun than knocking beer cans off'a fence.
> >
> > GregoryO'Connor
> > 94ptRomolandCa
> >
> >
> > --- In WanderlodgeForum@yahoogroups.com, Wilhelmus Schreurs
> > wrote:
> >>
> >>
> >> When I purchased my coach, I noticed that the top of the air
> > cleaner (cage) and the ducting to the intake was removed. I believe
> > this was done as it is commonly believed to be known, that it does
> > not appear to get enough air from the outside.
> >> Some quick calculations show that the intake is 27in by 1 1/2
> > inches = 40 sq in.
> >> Intake to filter is 5 in round or equivalent to 20 square inches,
> > this should be adequate air flow, or maybe the intake to the filter
> > should be increased say to 7 inches. (38 square inches)
> >> Also does the turbo not suck the air in as well??
> >> What I am planning to do is to restore everything, as right now it
> > is getting the very hot air from around the engine, and I believe it
> > should be getting the colder air from outside?
> >> Any advice, pros and cons would be appreciated.
> >> Thanks in advance.
> >>
> >> Bill 84 FC 35 SB "$quanderlodge"
> >> Terrace, B.C. Canada
> >>
> >>
> >>
> > __________________________________________________________________
> >> Connect with friends from any web browser - no download required.
> > Try the new Yahoo! Canada Messenger for the Web BETA at
> > http://ca.messenger.yahoo.com/webmessengerpromo.php
> >>
> >
> >
> >
> > ------------------------------------
> >
> > Yahoo! Groups Links
> >
> >
> >
>