Sound- absorption or reflection

[timvasqz]

David some of the gensets have the engine driven fan and open bottom
vault. Location of intake and exhaust are as important a variable as
maf. If the oil pan was insulated more of the engine heat would make
its way to the radiator. Many of the N14's put in Ford city tractors
(they dont have sleepers) have the oilpan insulated? my only guess is
to keep the heat from under the hood at low speeds???

'88 I picked up a longblock diesel Ford1900 (30hp)farm tractor engine
to prepare a tractor for remote use. after install I found temps ran
dangerously high. When I called the ford dealer for guidence the
first thing the parts man said is "Did you reinstall the hood?". I
had not and never considered the hood anything more than ornimental
as it was a thin sheetmetal 1/3 cover atop the engine. Once installed
the engine ran great and still serves us in Guam. My point here is
more calcs go into cooling and modifications should consider mfgs
origional methods. Or when making mods realize the related variable
to monitor.

One mod I never understand is the "Make it run cooler" add ons folks
do. when you make something run cooler than engineered you afford the
opertunity to add more stress with a lost 'heat caused by excessive
stress warning'. You hear it at rallys when someone brags 'I climbed
the XXXPass at 60 and temps never got above 165f'. These are the same
types who drop dead shoveling snow because they never break a
sweat. Most engines are from the factory designed to run safe while
within their abilities.

Greg of Tim&Greg
94ptca

--- In WanderlodgeForum@yahoogroups.com, david brady
wrote:
>
> I pulled this out of the Powertech manual: (for what it's worth),
>
> "Each engine is equipped with a high water temperature shutdown
> switch, which will automatically shut down the set if the operating
> temperature climbs too high. To prevent the generator set from
> shutting down make sure the compartment openings are large enough
> to allow adequate circulation of cooling air. The minimum free air
> opening in the compartment door is 400 sq. in. or 2580 sq. cm.
> Remember that louvers, screens and protective grills will restrict
airflow.
> A relatively open mesh screen will restrict airflow as much as 45%.
> The intake opening must be increased to compensate for
> such restrictions."
>
> David
> '02 LXi, NC
>
>
> Kurt Horvath wrote:
> >
> > I would say that careful inspections are the order of the day to
keep
> > your coach in top form and you safe.
> >
> > I'm not up to snuff on this post but in my case the new exhaust,
> > exhaust blankets on the new Stainless pipes (18ga.) and a soon to
be
> > installed thermal and acoustic insulation in the engine
compartment
> > she'll be cool, quite and efficient The blankets and the SS pipes
are
> > rated at over 2000 degrees continuous duty. So the hottest parts
are
> > insulated and the hottest gasses are directed out and away from
the
> > motor. I did install 2 - 1650 cfm electric fans in the engine
> > compartment, to take care of any other residual heating problems.
> > I don't see how insulating any Bird compartment would be
detrimental.
> > I can't imagine any engineer using the coach in any calculation
as a
> > heat sink, to dissipate any heat from the engine or generator
> >
> > Isn't that what radiators and exhausts are for.?
> >
> > I'll redo the insulation in the genny compartment when I do the
main
> > engine area.
> >
> > Look at any Prevost conversion the generators are mostly in
enclosed
> > compartments, Birds , at least the PT series are completely open
> > underneath. I would not worry about maximum insulation in the
genny
> > box. When driving you get air flow, when parked the blower is
sucking
> > air in from some where, some is air is flowing through the genny
> > box , along with the manifold, exhaust and valve cover blankets
it's
> > already retaining/containing a lot of heat internally that can
only
> > be removed through the exhaust and radiator. If after insulating
you
> > see higher temps. Install a lower temp. thermostat.
> >
> > After my near miss at burning up my coach I'd like to ask the
forum a
> > question.
> >
> > Has anybody ever checked the condition of the Generator exhaust
stack
> > that goes up through the body? And how would we go about checking
it?
> > It has the potential to be a serious issue should it be leaking
> > exhaust fumes into the coach.
> >
> > In my coach the Genny Stack is located next to the Fridge. How
well
> > insulated is it? Maybe that's why my Fridge works great when
parked
> > but doesn't when I'm driving. I almost always run the generator
when
> > driving, and yes it's running while parked if not at a place it
can
> > be plugged in to. So is it part of my Fridge cooling problem?
Maybe,
> > any thoughts?
> >
> > Kurt Horvath
> > 95 PT 42
> > 10AC
> >
> > --- In WanderlodgeForum@yahoogroups.com
> > , "timvasqz"
> > wrote:
> > >
> > > Not too far fetched. My cummins engine computer is cooled with
> > > diesel fuel. I am just curious where you were transfering heat
to
> > > with your 'insulation heat dissipation remanufacture redesign'
> > >
> > > heat is transfered and lost to other objects. for one thing to
> > lose
> > > heat somthing else must take it. its a calorie calc. when you
> > > insulate to keep heat from the interior of the bus where does
that
> > > heat now go?
> > >
> > > some times when an interior gets hot and calls for modification
it
> > > is an overlooked sign that the heat producer has other issues
> > causing
> > > excessive heat. KurtH can atest. in a genset the genhead may be
> > > cooking or engine exhaust is screwed up.
> > >
> > > Greg ofTim&Greg
> > > 94ptca
> > >
> > >
> > >
> > > WanderlodgeForum@yahoogroups.com
> > , "Stephen Birtles"
> >
> > > wrote:
> > > >
> > > > why thank you for the mindless dribble another useless comment
> > > >
> > > > Stephen 77fc35
> > > >
> > > >
> > > > --- In WanderlodgeForum@yahoogroups.com
> > , "timvasqz"
> > > wrote:
> > > > >
> > > > > To disipate heat, is to transfer it. Steve maybe you can
> > disapate
> > > it
> > > > > thru a dupree valve back to the tank? Call it Hot$$$$ ?
> > > > >
> > > > > I understand that the vault gets up to +250 degrees(USA). I
> > > guess
> > > > > that is a factor for Ernie to consider once he removed the
> > > disipation
> > > > > path of the vault heat to the bus interior. where does that
> > > heat
> > > > > now go.
> > > > >
> > > > > Insulation keeps environments from disapating heat. heat is
> > > removed
> > > > > so the method to remove the heat in the compartment would
now
> > be
> > > the
> > > > > radiator system and the diesel engine is the heat sink, but
> > the
> > > > > diesel engine caused most of the heat. If the origional
design
> > > was
> > > > > not intended to do that it would have to be beefed up
> > > > >
> > > > > If you insulate the exhaust the otherwise exposed metal does
> > not
> > > > > radiate heat in the compartment. heat goes out the stack
with
> > the
> > > > > exhast air. But is the stack able to take all the extra
heat.
> > > > >
> > > > > If someone complains to me about the noise my genset is
making
> > I
> > > > > say "What? can't hear you, my genset is too loud".
> > > > > GregofTim&Greg
> > > > > 94ptCa
> > > > >
> > > > >
> > > > >
> > > > > In WanderlodgeForum@yahoogroups.com
> > , "Stephen Birtles"
> > >
> > > > > wrote:
> > > > > >
> > > > > > We will look into re manufacturing or redesigning a
similar
> > > product
> > > > > > that will work as sound absorption as well as heat
> > dissipation
> > > > > > It will take some time to get a satisfactory product.
> > > > > > Stephen 77fc35
> > > > > >
> > > > > >
> > > > > > --- In WanderlodgeForum@yahoogroups.com
> > , "Ernest Ekberg"
> > > > > > wrote:
> > > > > > >
> > > > > > > After installing many generator compartments with the
new
> > > > > insulation, I
> > > > > > > was wondering if there is a manufacturer that offers
both.
> > > > > > > I insulated Bob Lawrences' generator compartment last
> > > December.
> > > > > He
> > > > > > > measured the db levels before and after and found that
> > while
> > > the
> > > > > heat
> > > > > > > was reflected from the interior of the coach, the sound
was
> > > also
> > > > > > > deflected to the outside. thus his db levels INCREASED
to
> > > over
> > > > > 90.
> > > > > > > I know my with my coach, that I have been asked to park
way
> > > > > downwind as
> > > > > > > my generator is really loud. Maybe its the dogs I carry
> > with
> > > me???
> > > > > > > But, if there is a product that will absorb that sound
> > while
> > > > > reflecting
> > > > > > > the heat, let's talk about it.
> > > > > > > Ernie-83PT40 in Texas, buying earplugs by the case~
> > > > > > >
> > > > > >
> > > > >
> > > >
> > >
> >
> >
> > ------------------------------------------------------------------
------
> >
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2/21/2009 3:36 PM
> >
>