Today's Message Index:
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1. 07:44 AM - Re: Re: exhaust system modification (Bob Haas)
2. 10:30 AM - Re: Re: exhaust system modification (Lynn Matteson)
3. 10:33 AM - Re: Re: exhaust system modification (Lynn Matteson)
Message 1
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| Subject: | Re: exhaust system modification |
Hey Lynn That is a positive move. I extended the pipes from
the two into one junction and added approximately 24 inches of extension
each side. I used motorcycle tabs and springs to support the additional
weight. It is not tuned but it's not too loud, and no cracks in about a 100
hours. I like your idea though. N 380 BH Alpi Pioneer Jabiru 2200.
-----Original Message-----
From: Lynn Matteson
Sent: Friday, June 08, 2012 11:12 PM
Subject: Re: JabiruEngine-List: Re: exhaust system modification
Hi Don-
It's really hard to say whether the power was improved or not, just
because of the very nature of flight....with race cars, you can
always compare lap times, 1/4 mile times, etc., but with the
varieties of flight conditions, I can't tell for sure if any more
power is being produced. My primary reason for doing this job was
inspiration that I got when reading the April 2012 issue of Kitplanes
magazine about making headers for a 540 Lycoming, I think it was.
Also, I had two straight pipes before and it was pretty noisy, and I
wanted to try to get the sound a bit more controlled.
To order the collector, I had to supply Burns with cam timing, valve
lift and size, port size, engine size, primary exhaust diameter,
desired rpm where the engine will run, etc., and they run those specs
through their design-X program and give you the recommended specs for
the collector and the diameter and length of the megaphone and the
reverse cone on the end. The reverse cone is said to extend the
torque range. I have to admit that I did not make the primaries the
exact length that I should have. To do so would have taken too much
time and effort.....I may do so in the future. This will require
making the original #3 and #4 pipe the same length as the original #1
and #2 pipes which are currently a bit longer. This means snaking
some tubing in a roundabout way so that all the primaries will be the
same length, and then the system will be tuned properly, and I'll get
the most benefit from the collector and megaphone. But I'm happy with
the system for now, and when I get bored, I'll fire up the TIG and
modify those #3 and 4 pipes.
Incidentally, I tried "back-purging" for the first time on this
job...stainless steel welding looks like crap without it....and was
amazed at how good the welds that I did came out. Burns has good
information on their website as to how to do this.
Lynn Matteson
Kitfox IV Speedster, taildragger
Jabiru 2200, #2062
Prince prop 64 x 30, P-tip
Electroair direct-fire ignition system
Rotec TBI-40 injection (sleeved to 36mm)
Status: flying with 1279 hrs... (since 3-27-2006)
On Jun 8, 2012, at 10:20 PM, dons701 wrote:
>
> Hi Lynn, gotta ask. Any noticeable changes in power??
>
> --------
> Zenith 701 #76120
> Jabiru 2200A #2456 95 hours
> Sensenich Wood 64-PJ-36 Prop
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=375070#375070
>
>
Message 2
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| Subject: | Re: exhaust system modification |
Thanks, Bob. The other reason that I did not try to "tune" the
primary pipes to the suggested 32" was because of the problem of
wrapping a heat muff around the pair of pipes on each side. If I had
added some "extender bends" to the rear pipes, the heat muff would
have been the size of a 55-gallon barrel. Here's a picture of the
heat muffs prior to welding on the in and out tubes, which are now
finished and installed:
Now that I look at the picture again, the heat muffs will stay the
same regardless of what I do to the Jabiru original rear primary
pipes, as long as I do it before the slip-joint....Duhhh!! (sometimes
I engage the fingers before the brain) Let me start again....the
main reason that I did not make all pipes the same length was to be
able to expedite the job, and get back to flying.
By the way, Burns' Stainless sells the tabs and springs (called
beehive springs, I think) and also sells stainless steel tabs which
sit side-by-side on the to-be-connected pipes and are held together
by a bolt.
Lynn Matteson
Kitfox IV Speedster, taildragger
Jabiru 2200, #2062
Prince prop 64 x 30, P-tip
Electroair direct-fire ignition system
Rotec TBI-40 injection (sleeved to 36mm)
Status: flying with 1280 hrs... (since 3-27-2006)
On Jun 9, 2012, at 10:44 AM, Bob Haas wrote:
> <checkpoint2@comcast.net>
>
> Hey Lynn That is a positive move. I extended the
> pipes from the two into one junction and added approximately 24
> inches of extension
> each side. I used motorcycle tabs and springs to support the
> additional weight. It is not tuned but it's not too loud, and no
> cracks in about a 100
> hours. I like your idea though. N 380 BH Alpi Pioneer Jabiru 2200.
>
Message 3
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| Subject: | Re: exhaust system modification |
Thanks, Bob. The other reason that I did not try to "tune" the
primary pipes to the suggested 32" was because of the problem of
wrapping a heat muff around the pair of pipes on each side. If I had
added some "extender bends" to the rear pipes, the heat muff would
have been the size of a 55-gallon barrel. Here's a picture of the
heat muffs prior to welding on the in and out tubes, which are now
finished and installed:
Now that I look at the picture again, the heat muffs will stay the
same regardless of what I do to the Jabiru original rear primary
pipes, as long as I do it before the slip-joint....Duhhh!! (sometimes
I engage the fingers before the brain) Let me start again....the
main reason that I did not make all pipes the same length was to be
able to expedite the job, and get back to flying.
By the way, Burns' Stainless sells the tabs and springs (called
beehive springs, I think) and also sells stainless steel tabs which
sit side-by-side on the to-be-connected pipes and are held together
by a bolt.
Lynn Matteson
Kitfox IV Speedster, taildragger
Jabiru 2200, #2062
Prince prop 64 x 30, P-tip
Electroair direct-fire ignition system
Rotec TBI-40 injection (sleeved to 36mm)
Status: flying with 1280 hrs... (since 3-27-2006)
On Jun 9, 2012, at 10:44 AM, Bob Haas wrote:
> <checkpoint2@comcast.net>
>
> Hey Lynn That is a positive move. I extended the
> pipes from the two into one junction and added approximately 24
> inches of extension
> each side. I used motorcycle tabs and springs to support the
> additional weight. It is not tuned but it's not too loud, and no
> cracks in about a 100
> hours. I like your idea though. N 380 BH Alpi Pioneer Jabiru 2200.
>
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