PT Radiator Air Scoop

[Gregory OConnor]

Rick, do you think the scoop did the trick of lowering the temp by
10 degrees or was it reduced by replacing the thermostat with one 10
degrees lower?

My mom had a slab leak under the Garage. She prayed about it every
day for a week. I ;removed the garage floor ;replumbed the washer
and U-sink ;repoured the floor slab ; paid the mud, pipe and labor.
One month with no leak and she now proclaims "My prayers were
answered". I need some credit here, maybe the -10 degree thermostat
does also.

GregoryO'Connor
94ptRomolandCa



--- In WanderlodgeForum@yahoogroups.com, "Rick A."
wrote:
>
> Scott,
> I have a scoop on my 85PT40. Living in Texas, and knowing that
heat is the ultimate
> killer of diesels and having to go thru the whole cooling system
lead me to add the
> scoop.
> The scoop sticks out 4 inches and is 7 inches wide. The size was
determined partially
> by the aluminum trim on the sides, so the scoop would match it
visually from the side of
> the bus. I measured my existing louvered grill and had a stainless
steel scoop made to fit
> over the grill at the end.
> The scoop and 2 additional modifications lowered my temps 10
degrees. I now run a
> maximum of 180. I also put in 10 degree lower thermostats and
changed my 1 speed
> engine cooling fan to a 2 speed. I can send you a picture if you
want. The mods also
> lower the engine oil temp, the tranny temp and the power
steering/fan system temp.
>
> Rick Archie
> 85PT40 "Fort R"
> Fort Worth
>
>
>
>
>
> --- In WanderlodgeForum@yahoogroups.com, "Scott Forman"
<scottforman75@>
> wrote:
> >
> > If the scoop pushed more air through the radiator, it could
lower
> > operating temp to the point that the alarmastat doesn't kick
in.
> > More air=cooler, that is the whole point of the fan. I am not
> > looking for lesson on how the colling system works, and if you
payed
> > attention you would see that I just mentioned that I have a
freshly
> > re-cored (i.e. NOT DIRTY) radiator in my bus. I am looking for
> > people that have anecdotal stories about scoops, not for people
who
> > are answering every question except the one I asked.
> >
> > Scott
> >
> > --- In WanderlodgeForum@yahoogroups.com, Leroy Eckert
> > wrote:
> > >
> > > First the scoop will not cool the radiator any quicker or
cooler or
> > reduce the fan on off sequence because the water temp is
controlled
> > by an instrument *Alarmstat* designated by BB. It the radiator
is
> > plugged up it ain't gonna cool, scoop, extra fans or anything
else. 
> > On most coaches through 1994 there is an Alarmstat which senses
the
> > water temp and activates the fan to high mode and back to idle
mode
> > constantly if the fan override and the chassis a/c is off. It
cycles
> > between -+ 8 degrees. It was specified by BB at 195 degrees.
> > Accordingly, the fan in idle mode spins between 200 and 600 rpm
at
> > engine rpm values  800-2100 rpm according to my BB manuals. So,
if
> > the radiator is not clean and good massive amounts of air will
do not
> > good the result being the fan will cycle more often. In high
mode,
> > chassis a/c on; or fan override on; the fan runs at approx. 1800
rpm.
> > The only thing that will stop the fan high/idle mode sequence
timing
> > is a new radiator.
> > > It makes a lot of sense. Bad radiator, no air flow, no
efficient
> > cooling. A scoop is not going to help a bad radiator. It is that
> > simple. Of course it may help for a bit if you remove the
Alarmstat,
> > let the fan run constantly and you may see some reduced temps.
> > > I have jacked with my bus using VMSpc for quite some time and
I
> > cannot prove the old wife's tale that the fan reduces mileage. I
have
> > documents with lots of numbers on them that support my opinion.
I
> > realize opinions are like a$$holes, everyone has one. However,
my
> > numbers prove my statement. I long ago changed my Alarmstat to
190
> > degrees after talking to BB and Detroit Diesel mechanics. I have
seen
> > a 7% decrease in overall temps without a decrease in mileage. I
have
> > a good radiator.
> > > My conclusion is, the Birds did not have a problem when they
were
> > built or there would have been a recall. 15-20 year old
radiators
> > need a good going over and all will be well. No scoop needed.
> > > Think of an Alarmstat as a forced high temp thermostat,
because
> > that is what it is.
> > >
> > > Leroy Eckert
> > > 1990 WB-40 Smoke N Mirrors
> > > Dahlonega, GA
> > > Royale Conversion
> > >
> > > --- On Wed, 8/6/08, Scott Forman <scottforman75@> wrote:
> > > From: Scott Forman <scottforman75@>
> > > Subject: [WanderlodgeForum] Re: PT Radiator Air Scoop
> > > To: WanderlodgeForum@yahoogroups.com
> > > Date: Wednesday, August 6, 2008, 8:07 PM
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > I do not have a cooling problem, in fact I just re-
> > cored my
> > >
> > > radiator. Just wondering if the scoop could give me the 5
degrees
> > I
> > >
> > > need to keep the fan from kicking on...which as we all know
saps
> > fuel
> > >
> > > economy...during hot weather.
> > >
> > >
> > >
> > > Scott
> > >
> > >
> > >
> > > --- In WanderlodgeForum@ yahoogroups. com, "Gregory OConnor"
> > >
> > > wrote:
> > >
> > > >
> > >
> > > > Scott, when the engineered systems will no longer control
the
> > heat,
> > >
> > > > there is issue with the systems. to make things run cooler
at
> > more
> > >
> > > > stress, can only prove to allow more stress than engineered.
I
> > pust
> > >
> > > it
> > >
> > > > to the limits of heat befor I back off stress. A mod to
help
> > >
> > > overcome
> > >
> > > > ambient temp influence like the radiator evaporative cooler
MikeH
> > >
> > > uses
> > >
> > > > is one mod I would like to try.
> > >
> > > >
> > >
> > > > GregoryO'Connor
> > >
> > > > 94ptRomolandCa
> > >
> > > >
> > >
> > > >
> > >
> > > >
> > >
> > > > --- In WanderlodgeForum@ yahoogroups. com, "Scott Forman"
> > >
> > > > <scottforman75@ > wrote:
> > >
> > > > >
> > >
> > > > > There was some talk a while back about fabricating an air
scoop
> > >
> > > for
> > >
> > > > the
> > >
> > > > > radiator grill on a PT to increase air flow through the
> > >
> > > radiator.
> > >
> > > > Did
> > >
> > > > > anyone install one? Does it seem to make a difference?
How
> > did
> > >
> > > you
> > >
> > > > > build it?
> > >
> > > > >
> > >
> > > > > Scott Forman
> > >
> > > > > 86 PT38
> > >
> > > > > Memphis
> > >
> > > > >
> > >
> > > >
> > >
> >
>