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1. 03:30 AM - Re: Re: High EGT cyl 5 -running out of ideas (Lynn Matteson)
2. 04:04 PM - Re: Re: High EGT cyl 5 -running out of ideas (GARY BARNETT)
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| Subject: | Re: High EGT cyl 5 -running out of ideas |
Peak EGT for any cylinder is the hottest that THAT cylinder reaches.
With a normal Bing you have no way of setting the mixture on the fly,
so the best you can do is to fly the plane while recording each and
every cylinder's EGT, while at the same time recording your fuel
flow. Like Old Bob said, if the cylinders all reach THEIR individual
peaks at very nearly the same fuel flow, that's the best you can do.
After all, you are dealing with a carbureted engine and a pretty
poorly designed intake manifold, and that combination has proven to
not be the best for trying to achieve EGT balance, whether it is the
Jabiru engine or any/most of the other engines out there. That is why
individual-port fuel injection was created.
I moved my EGT probe for my #1 cylinder (2200 Jabiru) 1", and did not
see an appreciable change in EGT readings. Changing/swapping probes
also did not change things.
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 1254 hrs... (since 3-27-2006)
On Apr 27, 2012, at 9:22 PM, ple190 wrote:
> <plge190@optusnet.com.au>
>
> Thanks for the input guys.
> Old BOB ---The problem with the Jab and bing carb is no mixture
> control so you have no way of knowing if your near peak EGT so I
> dont know if No 5 if at/near or above peak EGT?
>
> Barry --All the probs are in the same spot from the port. No 5 was
> a bit closer so i moved it to match the others with no change ?
> I will check if any cold air is being forced onto the senor
> Paul
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=371949#371949
>
>
Message 2
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| Subject: | Re: High EGT cyl 5 -running out of ideas |
PaulJust a little about a Hacman. I have one in my lightning=2C SN 133=2C
and I live at higher altitudes=2C field elevation 3250 ft=2C so I use it qu
ite a bit when I am going somewhere cross country and above 8=2C000 ft. It
works well and my fuel burn at 10=2C500 averages about 5.4 gal/hour at 285
0 RPM and 120 Knots. It will allow you to check your peak EGT's but if you
do check them do it above 9=2C000 ft to stay safely out of the detonation
area. This is a necessity on a carb. engine do to the wide variation in mi
xture between cylinders. If the Jabiru were fuel injected and had GAMI inj
ectors it would be much easier and simpler. Be sure you enrich the mixture
before you start down. I forgot once (there is no mixture on the normal c
heck list as it is an add on and it is mounted low on the center panel) the
result was rather startling. At reduced power while decending the engine
continues to run smoothly until you close the throttle on downwind at say 7
0knots. At that point the engine just stops cold with no fanfair at all an
d of course at 70-75 knots it will not windmill so the prop stops. The Lig
htning has a great glide ratio so I didn't bother to restart it but I did g
et some strange looks from other pilots who saw me land and restart as I ro
lled onto the taxiway. Gary
> Subject: JabiruEngine-List: Re: High EGT cyl 5 -running out of ideas
> From: plge190@optusnet.com.au
> Date: Fri=2C 27 Apr 2012 20:27:45 -0700
> To: jabiruengine-list@matronics.com
>
u>
>
> Nick- do you guys use the throttle extension on the carby ? I am and it l
imits the amount of twist you can get.
>
> Also looking at the jets you are using Nick may I'm running too rich and
as Barry said getting a burn in the exhaust pipe? I did increase the needle
from 285 to 290 and it didn't help maybe even worse. I guess with the hack
man I can lean out and see what happens. At least I'll know how close to pe
ak I am.
> It runs well just don't want to do any damage !!
>
> checked all the plugs the other day and they are all quite black and No.
5 is the same as the others ?
> I miss the good old days of steam gauges--or lack there of
> "ignorance is bliss"
> Paul
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=371968#371968
>
>
>
>
>
>
>
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