Today's Message Index:
----------------------
1. 02:34 PM - Oil temp (Wayne)
2. 08:02 PM - Re: Oil temp (cam andres)
3. 09:18 PM - Re: Oil temp (Perry Yaremchuk)
Message 1
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With about 9 hours on my 9A I cant get the oil any hotter than 170 F
and to do that I have to block off all the air flow to the cooler. I am
about to try insulating the oil lines.
I tried necking down the outlet air under the cowl . It started as
about 110 percent of the inlet area size and is now 92 percent . The
preliminary result is slightly cooler CHTs and EGTs and it goes 7 kts
faster. More testing is required when the weather breaks. The goal of
warming the oil more did not happen.
Any suggestions?
Wayne
Message 2
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Wayne,
Have you verified the temperature indicating components are accurate? I
would make sure that a bench test confirms their accuracy before going to
the next step.
Cam Andres
RV9A under construction
On Wed, Jan 28, 2009 at 3:14 PM, Wayne <wowens@darientel.net> wrote:
> With about 9 hours on my 9A I cant get the oil any hotter than 170 F and
> to do that I have to block off *all* the air flow to the cooler. I am
> about to try insulating the oil lines.
> I tried necking down the outlet air under the cowl . It started as about
> 110 percent of the inlet area size and is now 92 percent . The *
> preliminary* result is slightly cooler CHTs and EGTs and it goes 7 kts
> faster. More testing is required when the weather breaks. The goal of
> warming the oil more did not happen.
>
> Any suggestions?
> Wayne
>
> *
>
> *
>
>
Message 3
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Gee, never know when or how these list things pop up.
I have a 9a with about 260 hrs on a low compression 0-320. with the
cooler - mounted at the top rear of the plenum horizontally, last time
I did circuits it was about 50 F out and with the cooler fully blocked
at the rear, saw only about 160 - 165 F also. It never broke 200 in
the summer on a hot day, WOT climb to 5000'.
I also might suspect the instrumentation, but have just been looking
at adding a spin-on filter adapter, and noticed that some have a
built-in vernatherm, some don't, some rely on a bypass in the
filter.......in other words, you might have an open 'circuit' that is
running oil thru the filter, cooler and hoses, which provides a fair
bit of cooling area.
My limited experience operating is of little help, but in reading up
on it, the oil level will contribute to cool temps if you run over 5
or 6 quarts in the sump. If your carb is jetted quite rich, there's
another source of cooling....fuel. How agressively do you lean? sounds
like you have pretty good instrumentation, once you verify it is
accurate!
I like the sound of the obvious gain in efficiency by reducing your
outlet....how did you do this?
duct tape ? :-)....or something more permanent?
best of luck with your temps.....consider yourself thankful you're not
battling high temps instead!
Perry
On Wed, Jan 28, 2009 at 7:47 PM, cam andres <cameronandres@gmail.com> wrote:
> Wayne,
> Have you verified the temperature indicating components are accurate? I
> would make sure that a bench test confirms their accuracy before going to
> the next step.
> Cam Andres
> RV9A under construction
>
> On Wed, Jan 28, 2009 at 3:14 PM, Wayne <wowens@darientel.net> wrote:
>>
>> With about 9 hours on my 9A I cant get the oil any hotter than 170 F and
>> to do that I have to block off all the air flow to the cooler. I am about to
>> try insulating the oil lines.
>> I tried necking down the outlet air under the cowl . It started as about
>> 110 percent of the inlet area size and is now 92 percent . The preliminary
>> result is slightly cooler CHTs and EGTs and it goes 7 kts faster. More
>> testing is required when the weather breaks. The goal of warming the oil
>> more did not happen.
>>
>> Any suggestions?
>> Wayne
>>
>> et="_blank">http://www.matronics.com/Navigator?RV9-List
>> ttp://forums.matronics.com
>> _blank">http://www.matronics.com/contribution
>
>
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