Today's Message Index:
----------------------
1. 01:53 PM - SJ Cowl with Standard baffles (Robin Marks)
2. 02:46 PM - Re: SJ Cowl with Standard baffles (Linn Walters)
3. 05:18 PM - Re: SJ Cowl with Standard baffles (Robin Marks)
4. 06:28 PM - Re: SJ Cowl with Standard baffles (Linn Walters)
Message 1
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| Subject: | SJ Cowl with Standard baffles |
Is there anyone out there flying the Sam James Cowl but using standard
baffles in place of a plenum? If so can you please share your comments /
results?
I have committed to the James cowl on my 8A but don't want to deal with
a Plenum (again).
Thanks,
Robin
RV-4 Sold
RV-6A Sold
RV-10 Flying
RV-8A Engine hung
Message 2
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| Subject: | Re: SJ Cowl with Standard baffles |
I plan on a plenum for my -10. What was so terrible about your
experience???
Linn
do not archive
Robin Marks wrote:
> Is there anyone out there flying the Sam James Cowl but using standard
> baffles in place of a plenum? If so can you please share your comments /
> results?
>
> I have committed to the James cowl on my 8A but dont want to deal with
> a Plenum (again).
>
>
>
> Thanks,
>
> Robin
>
>
>
> RV-4 Sold
>
> RV-6A Sold
>
> RV-10 Flying
>
> RV-8A Engine hung
>
>
>
> *
>
>
> *
Message 3
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| Subject: | SJ Cowl with Standard baffles |
Linn,
If you plan on using a plenum with your standard Vans cowl then I
have no data for you but if you plan on installing a James Cowl & plenum
then be forewarned that there are significant cooling issues for both
the cylinders & oil that may be extremely time consuming to resolve
while receiving no additional speed benefit. The issues stem from not
having enough pressure on the upper deck driving down the cooling air to
the lower section of the engine and out to bottom of the cowl. There are
a number of us James/Plenum owners working on these cooling issues as
well as trying to fly LOP. Because of the pressure issues flying LOP is
all but impossible and we as a group are considering adding expensive &
complicated Turbo Pressure rails to counteract the pressure issues plus
a few other small fixes. None of us is able to fly LOP right out of the
box like many if not most standard cowl/baffle builders.
As you asked specifically about the Plenum I have to also say that
it seems an airtight plenum is a requirement. No sloppy work can be
allowed around here. With a well sealed plenum you have basically no
access to the top of your engine w/o both removing the top cowl and then
the plenum. It takes me a minute or two to remove my top cowl. Probably
15 minutes to remove and another 15 minutes to install the plenum. Plus
what seems like a lot of additional wear & tear. I was considering an
all aluminum plenum for my 8A with a hinged center column so I could
have quicker access to the cylinders but after much thought I was
soooooo much happier with my 4 & 6A and standard baffles. AKA the good
old days. As I have already sold my 8A cowl and committed to buy the
James cowl I was thinking of trying a James cowl w/o the plenum and
wanted input from anyone that may have gone down this path before.
One last word for you Linn as a -10 builder. I am flying now with
most of the construction behind me and a beautiful airplane to enjoy but
the whole James Cowl & Plenum has been a huge mistake FOR ME and I am
strongly considering replacing it with a Vans cowl. That is a drastic
step for a flying (and painted) plane. I would never consider this if I
could control my temps and fly LOP. I have not made a final decision so
please take this as another data point before you commit one way or the
other. Feel free to contact me off-list if you have further questions.
Robin
Robin @ painttheweb.com
-----Original Message-----
From: owner-rv-list-server@matronics.com
[mailto:owner-rv-list-server@matronics.com] On Behalf Of Linn Walters
Sent: Saturday, October 17, 2009 2:39 PM
Subject: Re: RV-List: SJ Cowl with Standard baffles
I plan on a plenum for my -10. What was so terrible about your
experience???
Linn
Robin Marks wrote:
> Is there anyone out there flying the Sam James Cowl but using standard
> baffles in place of a plenum? If so can you please share your comments
/
> results?
>
> I have committed to the James cowl on my 8A but don't want to deal
with
> a Plenum (again).
>
>
>
> Thanks,
>
> Robin
>
>
>
> RV-4 Sold
>
> RV-6A Sold
>
> RV-10 Flying
>
> RV-8A Engine hung
>
>
>
> *
>
>
> *
Message 4
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| Subject: | Re: SJ Cowl with Standard baffles |
Robin Marks wrote:
> Linn,
>
> If you plan on using a plenum with your standard Vans cowl
I am.
then I
> have no data for you but if you plan on installing a James Cowl & plenum
> then be forewarned that there are significant cooling issues for both
> the cylinders & oil that may be extremely time consuming to resolve
> while receiving no additional speed benefit. The issues stem from not
> having enough pressure on the upper deck driving down the cooling air to
> the lower section of the engine and out to bottom of the cowl. There are
> a number of us James/Plenum owners working on these cooling issues as
> well as trying to fly LOP. Because of the pressure issues flying LOP is
> all but impossible and we as a group are considering adding expensive &
> complicated Turbo Pressure rails to counteract the pressure issues plus
> a few other small fixes. None of us is able to fly LOP right out of the
> box like many if not most standard cowl/baffle builders.
I want the plenum so that ALL the cooling air goes through the cylinders
and oil cooler, not around them. Cowl seals are poor at best when new,
and go downhill fast with age.
>
> As you asked specifically about the Plenum I have to also say that
> it seems an airtight plenum is a requirement. No sloppy work can be
> allowed around here. With a well sealed plenum you have basically no
> access to the top of your engine w/o both removing the top cowl and then
> the plenum. It takes me a minute or two to remove my top cowl. Probably
> 15 minutes to remove and another 15 minutes to install the plenum. Plus
> what seems like a lot of additional wear & tear. I was considering an
> all aluminum plenum for my 8A with a hinged center column so I could
> have quicker access to the cylinders but after much thought I was
> soooooo much happier with my 4 & 6A and standard baffles. AKA the good
> old days. As I have already sold my 8A cowl and committed to buy the
> James cowl I was thinking of trying a James cowl w/o the plenum and
> wanted input from anyone that may have gone down this path before.
I'm aware of the access problem ..... but I tend to only want access to
the top of the engine during the conditional inspection ..... unless
something breaks.
>
> One last word for you Linn as a -10 builder. I am flying now with
> most of the construction behind me and a beautiful airplane to enjoy but
> the whole James Cowl & Plenum has been a huge mistake FOR ME and I am
> strongly considering replacing it with a Vans cowl. That is a drastic
> step for a flying (and painted) plane. I would never consider this if I
> could control my temps and fly LOP. I have not made a final decision so
> please take this as another data point before you commit one way or the
> other. Feel free to contact me off-list if you have further questions.
I will be in touch further on. Thanks for the comments.
Linn
>
>
>
> Robin
>
> Robin @ painttheweb.com
>
>
>
>
>
>
>
> -----Original Message-----
> From: owner-rv-list-server@matronics.com
> [mailto:owner-rv-list-server@matronics.com] On Behalf Of Linn Walters
> Sent: Saturday, October 17, 2009 2:39 PM
> To: rv-list@matronics.com
> Subject: Re: RV-List: SJ Cowl with Standard baffles
>
>
>
>
>
>
> I plan on a plenum for my -10. What was so terrible about your
>
> experience???
>
> Linn
>
>
>
>
>
> Robin Marks wrote:
>
> > Is there anyone out there flying the Sam James Cowl but using standard
>
> > baffles in place of a plenum? If so can you please share your comments /
>
> > results?
>
> >
>
> > I have committed to the James cowl on my 8A but dont want to deal with
>
> > a Plenum (again).
>
> >
>
> >
>
> >
>
> > Thanks,
>
> >
>
> > Robin
>
> >
>
> >
>
> >
>
> > RV-4 Sold
>
> >
>
> > RV-6A Sold
>
> >
>
> > RV-10 Flying
>
> >
>
> > RV-8A Engine hung
>
> >
>
> >
>
> >
>
> > *
>
> >
>
> >
>
> > *
>
>
>
>
>
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