Today's Message Index:
----------------------
1. 12:12 AM - high CHT temp. (jc@INFONET.COM.BR)
2. 08:19 AM - Re: (no subject) (Dale Larsen)
3. 09:04 AM - Re: (no subject) (kerrjohna@comcast.net)
Message 1
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--> RV9-List message posted by: jc@infonet.com.br
Hi Dick :
Ivew got the same problem. Aerosport O-320 D2A. Till now I did nothing since my
-9A is
inside the paint shop.
In my first flight Ive climbed to FL035. The ground temp was 83F and during the
climb
the CHT raise to 450F, full throtle. First thing Ill do will be sealling the baffling
front part with crankcase.
Keep me informed.
JC - Aracaju - Brasil
PU-JCI
RV-9A QB
1030 h bulding : 2,5 h flying
Message 2
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| Subject: | Re: (no subject) |
--> RV9-List message posted by: "Dale Larsen" <slickrock@been-there.com>
Dick,
Congratulations on the safe flight!
I think that you will find that new cylinders will run hot for the first
10-15 hours. I first flew mine in 90-100 degree weather from an airport at
4250 feet MSL. I too was concerned about the high temps which sometimes
were very near the upper CHT limit. In such weather, I was advised to keep
climbs slow, carefully watching the CHT. I found that just as the old
heads told me, the temps gradually decreased with time. 3 and 4 are still
slightly hotter even after 98 hours. This makes sense to me because they
are in the back, with 3 for some reason slightly hotter than 4.
I noted a similar trend with the oil temp. The oil temp kept getting lower
until around 40 hours, when it leveled off, and has been flat ever since. I
used straight mineral oil for the first 20 tach hours, then switched to
15-50.
I think that it may be too soon to consider modifying cowling, since you
haven't really broken the engine in yet. I find that the standard Van's
configuration for me is adequate, and I have no cooling problems. Even
during steep climbs on 100 degree days.
This was my experience, but you may want to consult Aerosport or your local
A&P.
Dale
----- Original Message -----
From: <KDMIGAS@aol.com>
Subject: RV9-List: (no subject)
> --> RV9-List message posted by: KDMIGAS@aol.com
>
> N951DM flew for the first time last Thurs. Still smiling!!In my first few
> test flights,am getting higher than desired cylinder head temps on #3 and
> 4(Aerosport o-320), Am also getting a lot of advice on the cause and would
> like to
> hear from anyone with the same type experience,especially the hot
> weather(Az,Nm,So Cal). What did you do,etc.
> I redid some baffling(helped some)
> Anybody enlarge the exit on the cowl??
> Thanks,
> Dick Migas 951DM, flying......
>
>
>
Message 3
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| Subject: | Re: (no subject) |
--> RV9-List message posted by: kerrjohna@comcast.net
At OSH this year, I noticed a number of examples of raised baffles in front of
#1 and #2 to increase the temperatures there and increase the downflow further
back. It might help.
N927BJ (90616) is in the paint booth right now and will be beginning final assembly
next week at KLGU
John Kerr
-------------- Original message --------------
> --> RV9-List message posted by: "Dale Larsen"
>
> Dick,
>
> Congratulations on the safe flight!
>
> I think that you will find that new cylinders will run hot for the first
> 10-15 hours. I first flew mine in 90-100 degree weather from an airport at
> 4250 feet MSL. I too was concerned about the high temps which sometimes
> were very near the upper CHT limit. In such weather, I was advised to keep
> climbs slow, carefully watching the CHT. I found that just as the old
> heads told me, the temps gradually decreased with time. 3 and 4 are still
> slightly hotter even after 98 hours. This makes sense to me because they
> are in the back, with 3 for some reason slightly hotter than 4.
>
> I noted a similar trend with the oil temp. The oil temp kept getting lower
> until around 40 hours, when it leveled off, and has been flat ever since. I
> used straight mineral oil for the first 20 tach hours, then switched to
> 15-50.
>
> I think that it may be too soon to consider modifying cowling, since you
> haven't really broken the engine in yet. I find that the standard Van's
> configuration for me is adequate, and I have no cooling problems. Even
> during steep climbs on 100 degree days.
>
> This was my experience, but you may want to consult Aerosport or your local
> A&P.
>
> Dale
>
> ----- Original Message -----
> From:
> To:
> Subject: RV9-List: (no subject)
>
>
> > --> RV9-List message posted by: KDMIGAS@aol.com
> >
> > N951DM flew for the first time last Thurs. Still smiling!!In my first few
> > test flights,am getting higher than desired cylinder head temps on #3 and
> > 4(Aerosport o-320), Am also getting a lot of advice on the cause and would
> > like to
> > hear from anyone with the same type experience,especially the hot
> > weather(Az,Nm,So Cal). What did you do,etc.
> > I redid some baffling(helped some)
> > Anybody enlarge the exit on the cowl??
> > Thanks,
> > Dick Migas 951DM, flying......
> >
> >
> >
>
>
>
>
>
>
At OSH this year, I noticed a number of examples of raised baffles in front of
#1 and #2 to increase the temperatures there and increase the downflow further
back. It might help.
N927BJ (90616) is in the paint booth right now and will be beginning final assembly
next week at KLGU
John Kerr
-------------- Original message --------------
-- RV9-List message posted by: "Dale Larsen" <SLICKROCK@BEEN-THERE.COM>
Dick,
Congratulations on the safe flight!
I think that you will find that new cylinders will run hot for the first
10-15 hours. I first flew mine in 90-100 degree weather from an airport at
4250 feet MSL. I too was concerned about the high temps which sometimes
were very near the upper CHT limit. In such weather, I was advised to keep
climbs slow, carefully watching the CHT. I found that just as the old
heads told me, the temps gradually decreased with time. 3 and 4 are still
slightly hotter even after 98 hours. This makes sense to me because they
are in the back, with 3 for some reason slightly hotter than 4.
I noted a simi
lar trend with the oil temp. The oil temp kept getting lower
until around 40 hours, when it leveled off, and has been flat ever since. I
used straight mineral oil for the first 20 tach hours, then switched to
15-50.
I think that it may be too soon to consider modifying cowling, since you
haven't really broken the engine in yet. I find that the standard Van's
configuration for me is adequate, and I have no cooling problems. Even
during steep climbs on 100 degree days.
This was my experience, but you may want to consult Aerosport or your local
AP.
Dale
----- Original Message -----
From: <KDMIGAS@AOL.COM>
To: <RV9-LIST@MATRONICS.COM>
Subject: RV9-List: (no subject)
-- RV9-List message posted by: KDMIGAS@aol.com
N951DM flew for the first time last Thurs.
Still smiling!!In my first few
test flights,am getting higher than desired cylinder head temps on #3 and
4(Aerosport o-320), Am also getting a lot of advice on the cause and would
like to
hear from anyone with the same type experience,especially the hot
weather(Az,Nm,So Cal). What did you do,etc.
I redid some baffling(helped some)
Anybody enlarge the exit on the cowl??
Thanks,
Dick Migas 951DM, flying......
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