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Airflow splitter for EGTs

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info(at)flylightning.net
Guest

Posted: Wed Apr 20, 2011 11:11 am Post subject: Airflow splitter for EGTs

Group,  

   

For some time now Bill Browns from IL has been playing with intake splitters to even out the large Difference in EGTS from left to right bank.  

One of the last designs, a four way splitter, was purposed to go in the outlet tube of the Airbox to the carb. I know that Bill and a few others have testing it there with ok results.  

   

A little back story here. From day one we have always attached the SCAT hose directly to the Carb in a Lightning. The Jabiru manual says to have a clean bore tube attached to the carb than the scat hose.  

For one reason or another I paid no attention to this and didn’t do it. Was as of late, say the last 6 planes or so out of SYI I have installed a smooth bore fiberglass tube to the carb.   

It does make installing the SCAT easier but did nothing for my EGTS, bummer. So I thought well why not stick the Splitter in the tube right in front of the CARB, it can’t get any worse, and the air certainly can’t tumble after it no room.  

   

So a test flight with out The splitter installed and just the fiberglass tube revealed EGTs as follows at WOT.  Lowest was 1050 degrees and the highest was near 1400 degrees. Yep that is what we see with out the tube.  

Back on the ground and insert the Splitter. WOW what a difference, low EGTs now 1180 degrees and the high was 1240 degrees at WOT!!! Never seen that. Full power in level flight showed the same results. Cruise was also much better.  

So this is just chance right one install, cant be the same on the next plane right?  

   

Note the 2 pictures, One shows the 4 way splitter insert, and a Splitter built in to a aluminum tube. The second picture is where the smooth bore tube attaches, in this case a fiberglass tube for the insert.  

   

The splitter built in to the tube is intended to be a production style finished part with no insert. So I stuck this on the newest LS-1 we are flying. Same idea just looks better.  

   

WOW again, same results. WOT EGT low 1140 degrees, High EGT was 1220 Degrees. The rest of course in the middle.  The spread was great just a little rich, so swap out the 255 main jet to a 250 main jet with better leaner temps.  

With the 250 main jet we see 1220 LOW egt and 1280 High EGT at full power WOT. That’s outstanding in my book.  

   

So with two plane flying with identical results I think we are on to solving the uneven fuel distribution and full throttle. I have sent a few more of these out  to other dealers and Lighting builders to play with ( umm test) and see what happens.  

   

We just have to find some one to build them for us, unless Bill wants to mass produce them in his basement!   

   

Nick

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Clive J

Joined: 03 Nov 2007
Posts: 340
Location: UK

Posted: Wed Apr 20, 2011 8:25 pm Post subject: Airflow splitter for EGTs

This looks interesting and thanks for sharing it. The WOT  uneven running on my Esqual's 3300 went away with a smooth bend though I've  never moved to the next step, chasing EGT's.

  

 I had always wondered if the place for the 'straightening  device' was in a straight line to the carb. 

 In industrial flow measurement we always have the  straightening bundle after the bend in a straight line to the measuring  device.

 The bundle is usually just that, a bundle of tubes inside the  pipe, that would be the most efficient way of straightening the flow but in our  case would be a little restrictive of airflow unless the tubes could be really  thin (like drinking straws).

 Unfortunately there is no space for the fibreglass tube on the  Esqual and I imagine some other engine installations, though I think something  of the style of this could be fashioned in the last part of the  bend..

  

 One question, does the orientation of the cross of the  splitter have any effect. + or x ?

  

 Nick, have you considered, forwarding on these results to  the engine lists?  jabiruengines(at)yahoogroups.com (jabiruengines(at)yahoogroups.com)   jabiruengine-list(at)matronics.com (jabiruengine-list(at)matronics.com) given  the benefit that would likely apply to many installations.

  

 Regards, Clive

  

  

   

 From:  owner-lightning-list-server(at)matronics.com  [mailto:owner-lightning-list-server(at)matronics.com] On Behalf Of  flylightning

Sent: 20 April 2011 20:06

To:  lightning-list(at)matronics.com

Subject: Airflow splitter  for EGTs

 

  

Group, 

  

For some time now Bill Browns from  IL has been playing with intake splitters to even out the large Difference in  EGTS from left to right bank. 

One of the last designs, a four way  splitter, was purposed to go in the outlet tube of the Airbox to the carb. I know that  Bill and a few others have testing it there with ok  results. 

  

A little back story  here. From day one we have always  attached the SCAT hose directly to the Carb in a  Lightning. The Jabiru manual says to have a clean bore  tube attached to the carb than the scat  hose. 

For one reason or another I paid no  attention to this and didn’t do it. Was as of late, say the last 6 planes or so  out of SYI I have installed a smooth bore fiberglass tube to the carb.  

It does make installing the SCAT  easier but did nothing for my EGTS, bummer. So I thought well why not stick the  Splitter in the tube right in front of the CARB, it can’t get any worse, and the  air certainly can’t tumble after it no  room. 

  

So a test flight with out The splitter installed and just the fiberglass tube revealed  EGTs as follows at WOT.  Lowest was 1050 degrees and the highest  was near 1400 degrees. Yep that is what we see with out the  tube. 

Back on the ground and insert the  Splitter. WOW what a difference, low EGTs now 1180  degrees and the high was 1240 degrees at WOT!!! Never seen  that. Full power in level flight showed the same results. Cruise was also  much better. 

So this is just chance right one  install, cant be the same on the next plane right? 

  

Note the 2 pictures, One shows the 4 way splitter insert, and a Splitter built in  to a aluminum tube. The second picture is where the smooth bore tube attaches,  in this case a fiberglass tube for the insert. 

  

The splitter built in to the tube is  intended to be a production style finished part with no insert. So I stuck this  on the newest LS-1 we are flying. Same idea just looks  better. 

  

WOW again, same results. WOT EGT low  1140 degrees, High EGT was 1220 Degrees. The rest of course in  the middle.  The spread was  great just a little rich, so swap out the 255 main jet  to a 250 main jet with better leaner temps. 

With the 250 main jet we see 1220 LOW egt and 1280  High EGT at full power WOT. That’s outstanding in my  book. 

  

So with two plane flying with  identical results I think we are on to solving the uneven fuel distribution and  full throttle. I have sent a few more of these out  to other dealers and Lighting  builders to play with ( umm test) and see what  happens. 

  

We just have to find some one to  build them for us, unless Bill wants to mass produce them in his basement!   

  

Nick

  [quote][b]

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info(at)flylightning.net
Guest

Posted: Thu Apr 21, 2011 8:35 am Post subject: Airflow splitter for EGTs

Clive,  

   

I think you could fit it to the esqual but it would require a reversal of the SCAT at the firewall to get back to the airbox. This shouldn’t cause a problem because the splitter is at the carb.  

The splitter is mounted like + I haven’t tried it the other way. Haven’t thought about it really. IT work very well in our set up and I know that we have seen uneven EGTS in the lighting.   

I really don’t want to suggest a solution if others aren’t having a problem.  

   

Nick  

   

--

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