Today's Message Index:
----------------------
1. 08:12 AM - Re: Rocket-List Digest: 6 Msgs - (Rob Ray)
2. 08:24 AM - Re: Rocket-List Digest: 6 Msgs - (John W. Cox)
3. 08:43 AM - Re: Rocket-List Digest: 6 Msgs - (Rob Ray)
4. 08:53 AM - Inverted fuel system (David Miller)
5. 09:16 AM - Re: Inverted fuel system (BPA)
6. 10:47 AM - Re: Rocket-List Digest: 6 Msgs - (Jim Stone)
7. 03:08 PM - Re: Inverted fuel system (Tom Utterback)
Message 1
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| Subject: | Re: Rocket-List Digest: 6 Msgs - |
Jim,
I trimmed 3" off my lower cowl lip on the standard Harmon cowl. This made my
outlet area slightly larger than my inlet area in an effort to help my cowl "draft"
a bit better. This lowered all my CHT's by 25-50 degrees and my oil to 185-200
all the time.
I live where it gets hot and I have never had a temp problem at any power setting.
Rob Ray
Good points and most have been considered.
1. Baffles are good.
2. CHTs only high above 23 inches MAP
3. Don't know how to measure such an irregular shape such as the cowl
opening. I did little to no trimming on John's stock cowl.
4. Will have a look at the cylinder fins for flashing.
Thanks,
Jim Stone
Louisville
UPDATE CHTs are now staying below 390 deg except for cyl #6 when above 23"
MAP. BTW, My oil cooler is aft of #6. Oil temps are 200 ish and lately a
bit less. All indications are that the initial break in has occurred but I
will continue to run it hard. Did you know that Lycoming recommends running
at 24"MAP and 2300rpm and every five minutes advance rpm to max and slowly
retard to 2200 then back to 2300 and continue this routine for 20 minutes.
After that, they don't really say. Check out there videos on the Lycoming
website under support.
----- Original Message -----
From: "Peter van Schoonhoven"
Sent: Wednesday, September 26, 2007 12:22 PM
Subject: Re: Rocket-List: Rocket-List Digest: 6 Msgs - 09/24/07Rocket-List
Digest: 6 Msgs - 09/24/07High compression, high CHTsHigh compression, high
CHTsHigh compression, high CHTsHigh compression, high CHTsHigh compression,
high CHTsHigh compression, high CHTsHigh compression, high CHTs
>
>
> Gentlemen,
>
> There have been many emails concerning the mags and ignition timing. The
> actual problem is high CHTs . Ignition issues MIGHT be a possible cause
> of this. But there are many other reasons that CHTs are high, and before
> delving into ignition issues alone, some of the other possibilities should
> be investigated.
>
> As I see it here is a summary of the situation:
> 1. new engine
> 2, New engine installation, a new cowling, baffles, instrumentation
>
> Here is what I would check first:
>
> 1. Baffle and seal condition and fitment
> 2. Are CHTs high even at reduced power? Yes the engine can make a lot of
> HP and heat, but at say 20 inches and 2300 rpm the temps should be low,
> assuming the cowling and baffles are working properly. If it will not run
> cool at low power, then the cowling design air flow must be improved.
> 3. Is the opening at the bottom of the cowling big enough? I have had
> airplanes where the lower opening was too small, adding a cowl flap made a
> huge difference in CHTs. I am not saying this is necessary, but compare
> the opening to other Rockets first. The person who cut the lower opening
> may not have used the right dimensions
> 4. Investigate the fins on the cylinders, especially those between the
> spark plugs. You can look down and see right through there, but on some
> cylinders I have bought, there was a great deal of flashing not removed
> from the casting which reduces airflow there and hence heat dissipation.
> Not to mention, that is right where the CHT probe lives.
>
> These problems can be frustrating. I am only trying to help direct your
> efforts to the place where the solution might be found. Good luck.
>
> Peter van Schoonhoven
> RV3, C210, Bucker Jungmann, all flying; Harmon Rocket abuilding
>
>
>
---------------------------------
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Message 2
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| Subject: | Rocket-List Digest: 6 Msgs - |
Rob, can you post a picture of the final trim appearance?
John Cox
________________________________
From: owner-rocket-list-server@matronics.com
[mailto:owner-rocket-list-server@matronics.com] On Behalf Of Rob Ray
Sent: Friday, September 28, 2007 8:12 AM
Subject: Re: Rocket-List: Rocket-List Digest: 6 Msgs -
Jim,
I trimmed 3" off my lower cowl lip on the standard Harmon cowl. This
made my outlet area slightly larger than my inlet area in an effort to
help my cowl "draft" a bit better. This lowered all my CHT's by 25-50
degrees and my oil to 185-200 all the time.
I live where it gets hot and I have never had a temp problem at any
power setting.
Rob Ray
Message 3
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| Subject: | Rocket-List Digest: 6 Msgs - |
Will do...
"John W. Cox" <johnwcox@pacificnw.com> wrote: Rob, can you post a
picture of the final trim appearance?
John Cox
---------------------------------
From: owner-rocket-list-server@matronics.com [mailto:owner-rocket-list-server@matronics.com] On Behalf Of Rob Ray
Sent: Friday, September 28, 2007 8:12 AM
To: rocket-list@matronics.com
Subject: Re: Rocket-List: Rocket-List Digest: 6 Msgs -
Jim,
I trimmed 3" off my lower cowl lip on the standard Harmon cowl. This made my
outlet area slightly larger than my inlet area in an effort to help my cowl "draft"
a bit better. This lowered all my CHT's by 25-50 degrees and my oil to
185-200 all the time.
I live where it gets hot and I have never had a temp problem at any power setting.
Rob Ray
http://www.matronics.com/Navigator?Rocket-List
http://forums.matronics.com
---------------------------------
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Message 4
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| Subject: | Inverted fuel system |
Does anyone know of an inverted fuel system, for a Lycoming 540, that will
work with auto fuel.
Dave Miller
Tennessee
HRII under construction
Message 5
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| Subject: | Inverted fuel system |
Call Don at Airflow Performance (864) 576-0201. His systems I believe
are compatible with mogas
Allen Barrett
BPE, Inc.
www.barrettprecisionengines.com
<http://www.barrettprecisionengines.com/>
-----Original Message-----
From: owner-rocket-list-server@matronics.com
[mailto:owner-rocket-list-server@matronics.com] On Behalf Of David
Miller
Sent: Friday, September 28, 2007 9:53 AM
Subject: Rocket-List: Inverted fuel system
Does anyone know of an inverted fuel system, for a Lycoming 540, that
will work with auto fuel.
Dave Miller
Tennessee
HRII under construction
Message 6
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| Subject: | Re: Rocket-List Digest: 6 Msgs - |
Rob,
Shoot me a pic too.
Thanks,
Jim Stone
Louisville
Flight test update. I hit 200 knots at 1500 feet yesterday and my right
gear leg fairing failed, pics available.
----- Original Message -----
From: Rob Ray
To: rocket-list@matronics.com
Sent: Friday, September 28, 2007 11:12 AM
Subject: Re: Rocket-List: Rocket-List Digest: 6 Msgs -
Jim,
I trimmed 3" off my lower cowl lip on the standard Harmon cowl. This
made my outlet area slightly larger than my inlet area in an effort to
help my cowl "draft" a bit better. This lowered all my CHT's by 25-50
degrees and my oil to 185-200 all the time.
I live where it gets hot and I have never had a temp problem at any
power setting.
Rob Ray
Jim Stone <jrstone@insightbb.com> wrote:
Good points and most have been considered.
1. Baffles are good.
2. CHTs only high above 23 inches MAP
3. Don't know how to measure such an irregular shape such as the
cowl
opening. I did little to no trimming on John's stock cowl.
4. Will have a look at the cylinder fins for flashing.
Thanks,
Jim Stone
Louisville
UPDATE CHTs are now staying below 390 deg except for cyl #6 when
above 23"
MAP. BTW, My oil cooler is aft of #6. Oil temps are 200 ish and
lately a
bit less. All indications are that the initial break in has occurred
but I
will continue to run it hard. Did you know that Lycoming recommends
running
at 24"MAP and 2300rpm and every five minutes advance rpm to max and
slowly
retard to 2200 then back to 2300 and continue this routine for 20
minutes.
After that, they don't really say. Check out there videos on the
Lycoming
website under support.
----- Original Message -----
From: "Peter van Schoonhoven"
To:
Sent: Wednesday, September 26, 2007 12:22 PM
Subject: Re: Rocket-List: Rocket-List Digest: 6 Msgs -
09/24/07Rocket-List
Digest: 6 Msgs - 09/24/07High compression, high CHTsHigh
compression, high
CHTsHigh compression, high CHTsHigh compression, high CHTsHigh
compression,
high CHTsHigh compression, high CHTsHigh compression, high CHTs
>
>
> Gentlemen,
>
> There have been many emails concerning the mags and ignition
timing. The
> actual problem is high CHTs . Ignition issues MIGHT be a possible
cause
> of this. But there are many other reasons that CHTs are high, and
before
> delving into ignition issues alone, some of the other
possibilities should
> be investigated.
>
> As I see it here is a summary of the situation:
> 1. new engine
> 2, New engine installation, a new cowling, baffles,
instrumentation
>
> Here is what I would check first:
>
> 1. Baffle and seal condition and fitment
> 2. Are CHTs high even at reduced power? Yes the engine can make a
lot of
> HP and heat, but at say 20 inches and 2300 rpm the temps should be
low,
> assuming the cowling and baffles are working properly. If it will
not run
> cool at low power, then the cowling design air flow must be
improved.
> 3. Is the opening at the bottom of the cowling big enough? I have
had
> airplanes where the lower opening was too small, adding a cowl
flap made a
> huge difference in CHTs. I am not saying this is necessary, but
compare
> the opening to other Rockets first. The person who cut the lower
opening
> may not have used the right dimensions
> 4. Investigate the fins on the cylinders, especially those between
the
> spark plugs. You can look down and see right through there, but on
some
> cylinders I have bought, there was a great deal of flashing not
removed
> from the casting which reduces airflow there and hence heat
dissipation.
> Not to mention, that is right where the CHT probe lives.
>
> These
Message 7
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| Subject: | Re: Inverted fuel system |
I ran my B4B5 for 7 years on 87 100% mogas with Airflow and didn't have to
clean the plugs at annual they were so clean. NEVER a problem. New overhaul
and up to 260 HP now with ECI jugs. Both ECI and Superior say it's ok to run
mogas. Need the 93 grade now.Go to their website or call them. They answered
my e-mail and also told me again in person at OSH.They advised to run a tank
of 100LL every so often and advised to retard timing a tad. No elec ign with
mogas tho. Go for it.
On 9/28/07, David Miller <David.Miller@cmworks.com> wrote:
>
> Does anyone know of an inverted fuel system, for a Lycoming 540, that
> will work with auto fuel.
>
> Dave Miller
> Tennessee
> HRII under construction
>
> *
>
> *
>
>
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