Air to Turbo

[michaelhohnstein]

--- In WanderlodgeForum@yahoogroups.com, Wilhelmus Schreurs


Consider running the air inlet over the top of the engine. My
solution was to make an air inlet grill under the windshield. the
side inlet deal was too restrictive. Transition from square to round
is part of the challenge, but the end result was pretty good.
With the addition of a charge air cooler and a larger radiator my
temps were about as high as one would want on the hard grades when
we travled to Idaho over I-90 and US-12. Turned the spray bar on a
couple of times and consumed about 4 gallons of distilled water with
20% windsheild washer solvent. Pyro went to 1000, water to 200 trans
to 220 @ the top fitting, engine oil 230.
I have resolved to minimize the use of the toad trailer, 11,200 #s
slows the bird down too much on the grades.












wrote:
>
> Wow, this will take a while to absorb LOL.
> Thanks David
> Bill 84 FC 35 SB "$quanderlodge"
> Terrace, B.C. Canada
>
>
>
>
> ----- Original Message ----
> From: David Brady
> To: WanderlodgeForum@yahoogroups.com
> Sent: Monday, June 23, 2008 2:26:55 PM
> Subject: Re: [WanderlodgeForum] Re: Air to Turbo
>
>
> Bill,
>
> I'm by no means an expert in this area, like that
> ever stopped me before , so I yanked these little
> gems off the web. Based on the Ideal Gas Equation
> (PV=nRT) and this nifty engine volumetric flow rate
> equation, we have the following mass air flow calculation
> for your engine running at full tilt:
>
> volume of air (cu ft/min) = engine rpm x engine cid
>                                 (1728 x 2)
> Mass air flow(lbs/min) = P(psia) x V(cu.ft./min) x 29
>                  (10.73 x T(deg R))
>
> For your motor at the exit of the turbo compressor:
> CID = 636 cu.in. (engine displacement)
> RPM = 2200 (engine rpm at max power)
> P = 14.7 + 20 (max turbo boost pressure) = 34.7 psia
> V = 405 cu ft/min, (engine volume rate of air)
> T = 250 degF + 460 = 710 deg R (air temp at turbo output)
> mass air flow(lbs/min) = 53.5 lb/min
> Based on squeezing 53.5 lb/min of air thru your intake
> plenum, which I'm modeling as a pipe with bends, at
> standard air pressure 14.7psi and temp 68degF, I found
> this nifty pipe airflow calculator:
>
> http://www.pipeflow calculations. com/airflow/ index.htm
>
> Plugging in the mass air flow, pipe diameter and length,
> 14.7psi ambient air pressure, and 70 degF, I get the
> following pressure drops across the pipe:
>
> Diameter    Length         Pressure Drop across pipe
> 3"            72"          0.67 psi
> 4"            72"          0.19 psi
> 5"            72"          0.075 psi
> 6"            72"          0.035 psi
> 7"            72"          0.019 psi
>
> Based on this I would say that your 5" air filter intake
> is adequate and that your 40 sq.in. ram air intake is also
> adequate, as long as the plenum length from ram intake to
> turbo is no longer than 72", I'd restore the system to
> original. If your intake is longer than 72" we'll have to
> redo the calculation. Most likely the air filter element
> is the largest restrictor in the system.
>
> As far as turbulence in the 5" dia air intake plenum, well
> the air velocity there is 87 ft/s, so it does appear that
> turbulence is a concern, but the above referenced caculator
> takes that into account via it's roughness index (Kr)
> which I set to .00177 inch for steel pipe. There's another
> constant in the above calculator, (Ksi) the minor loss
> coefficient. This I set to one which accounts for bends in
> your intake plenum: 3 long radius flanged 45's and 2 long
> radius flanged 90 deg's. So you can see, modeling the pipe
> is a real pain. The pressure drops across the pipe are
> quite sensitive to this parameter. Hope this helps
>
> Please someone, crap detect this. :-)
>
> David Brady
> '02 LXi, NC
>
>
> 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
> >
> >
> >
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