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Vince Frazier
Joined: 10 Jan 2006
Posts: 132
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 Posted: Fri Oct 05, 2007 7:04 am Post subject: lean of peak injector balancing |
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Jim,
Read this.
http://www.swaircraftappraisals.com/MeyersForum/Engine%20Info/Engine%20O
peration/Pelican's%20Perch%20Mixture%20Magic.htm
It will tell you what you need to know.
To balance your injectors only requires a few flights to get 'em pretty
close. More if you really want excuses to test fly.
The injectors that came with your engine are most likely all the same
ID. But each cylinder has different flow patterns. IOW, the injectors
should be matched to the flow, but they aren't.
Assuming that you have a 6 cylinder EGT monitoring capability, fly at a
fixed throttle and prop setting and altitude, start rich of peak and
begin leaning and record the fuel flow vs. EGT every 0.1 gph. Just
record the stuff near the peak EGTs, not all the way down from 28gph. No
need for that much data! You're just looking for the peaks.
The first cylinder to peak is the leanest, and so on. When you get back
on the ground, call Don Rivera at Airflow Performance and tell him what
you found. He can send you new injectors of varying ID to replace your
existing ones. It's not that expensive and you'll easily save the money
back in fuel savings.
Basically, you're going to swap the leanest injector for one with a bit
larger ID. Changing one injector changes the flow to the others since
they're all drinking from the same well. So, you will have some trial
and error involved, but not too much.
You might need to swap the injectors around a bit, but when you get the
peaks to happen within a GPH, or better yet, 0.5GPH you should have a
smooth running, LOP, gas saving, clean plugs, cool temps engine.
This is all from memory... hope I remembered the high spots.
Vince
P.S. Make sure that your EGT probes really are in the cylinder that you
think they are or it'll get real interesting.
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_________________
Vince Frazier
3965 Caborn Road
Mount Vernon, IN 47620
812-464-1839 work
812-985-7309 home
F-1H Rocket, N540VF
http://vincesrocket.com/ |
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kahuna
Joined: 02 Feb 2007
Posts: 93
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| Posted: Fri Oct 05, 2007 7:40 am Post subject: lean of peak injector balancing |
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You may find this useful.
MIke
http://www.mstewart.net/super8/nozzles/index.htm
[img]cid:1__=08BBF9F8DFC581DA8f9e8a93df938(at)us.ibm.com[/img]"Frazier, Vincent A" <VFrazier(at)usi.edu>
[img]cid:3__=08BBF9F8DFC581DA8f9e8a93df938(at)us.ibm.com[/img]
To
[img]cid:3__=08BBF9F8DFC581DA8f9e8a93df938(at)us.ibm.com[/img]
<rocket-list(at)matronics.com> [img]cid:3__=08BBF9F8DFC581DA8f9e8a93df938(at)us.ibm.com[/img]
cc
[img]cid:3__=08BBF9F8DFC581DA8f9e8a93df938(at)us.ibm.com[/img]
[img]cid:3__=08BBF9F8DFC581DA8f9e8a93df938(at)us.ibm.com[/img]
Subject
[img]cid:3__=08BBF9F8DFC581DA8f9e8a93df938(at)us.ibm.com[/img]
lean of peak injector balancing [img]cid:3__=08BBF9F8DFC581DA8f9e8a93df938(at)us.ibm.com[/img][img]cid:3__=08BBF9F8DFC581DA8f9e8a93df938(at)us.ibm.com[/img]
--> Rocket-List message posted by: "Frazier, Vincent A" <VFrazier(at)usi.edu>
Jim,
Read this.
http://www.swaircraftappraisals.com/MeyersForum/Engine%20Info/Engine%20O
peration/Pelican's%20Perch%20Mixture%20Magic.htm
It will tell you what you need to know.
To balance your injectors only requires a few flights to get 'em pretty
close. More if you really want excuses to test fly.
The injectors that came with your engine are most likely all the same
ID. But each cylinder has different flow patterns. IOW, the injectors
should be matched to the flow, but they aren't.
Assuming that you have a 6 cylinder EGT monitoring capability, fly at a
fixed throttle and prop setting and altitude, start rich of peak and
begin leaning and record the fuel flow vs. EGT every 0.1 gph. Just
record the stuff near the peak EGTs, not all the way down from 28gph. No
need for that much data! You're just looking for the peaks.
The first cylinder to peak is the leanest, and so on. When you get back
on the ground, call Don Rivera at Airflow Performance and tell him what
you found. He can send you new injectors of varying ID to replace your
existing ones. It's not that expensive and you'll easily save the money
back in fuel savings.
Basically, you're going to swap the leanest injector for one with a bit
larger ID. Changing one injector changes the flow to the others since
they're all drinking from the same well. So, you will have some trial
and error involved, but not too much.
You might need to swap the injectors around a bit, but when you get the
peaks to happen within a GPH, or better yet, 0.5GPH you should have a
smooth running, LOP, gas saving, clean plugs, cool temps engine.
This is all from memory... hope I remembered the high spots.
Vince
P.S. Make sure that your EGT probes really are in the cylinder that you
think they are or it'll get real interesting.
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jrstone(at)insightbb.com
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| Posted: Fri Oct 05, 2007 6:59 pm Post subject: lean of peak injector balancing |
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Great stuff, thanks Vince,
Jim
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