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Induction Air

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jeff(at)rmmm.net
Guest

Posted: Wed Jan 21, 2009 3:07 pm Post subject: Induction Air

Hi All,

While I have Gold Rush in for the winter annual I'm considering some 

cowl changes. Including closing off the upper NACA use for induction 

air on the 912-S and using the lower starboard NACA normally used for 

the 914 induction. I seem to remember someone else using that for carb 

intake and under cowl carb heat. I'm going to use the same air plenum 

with the same filter as now but I will fabricate a side intake to 

attach to the top of the plenum and a 2 inch scat tube coming up from 

the below NACA. My question is this. I already have the inlet plumed 

for this 2 inch tube and not a lot of room to increase it to 3 inch. My 

concerns is if the 2 inch would be enough for both carbs. Has anyone 

else done this with the 912-S and if so what size of tube did you use?



Best Regards,



Jeff R.

A258 - N128LJ / Gold Rush 175 hours and climbing slowly cause this 

winter if frickin could & wet for Tennessee ;o(. Must be al's global 

warming!

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topglock(at)cox.net
Guest

Posted: Wed Jan 21, 2009 3:22 pm Post subject: Induction Air

Jeff,



It's square inches, my friend.  Get out the old pi r squared and figure 

the square inches in the duct cross section.  Then compare that to the 

square inches of the inlet opening.



Jeff



JEFF ROBERTS wrote:

 	  Quote: 	
		   Hi All,

 While I have Gold Rush in for the winter annual I'm considering some 

 cowl changes. Including closing off the upper NACA use for induction air 

 on the 912-S and using the lower starboard NACA normally used for the 

 914 induction. I seem to remember someone else using that for carb 

 intake and under cowl carb heat. I'm going to use the same air plenum 

 with the same filter as now but I will fabricate a side intake to attach 

 to the top of the plenum and a 2 inch scat tube coming up from the below 

 NACA. My question is this. I already have the inlet plumed for this 2 

 inch tube and not a lot of room to increase it to 3 inch. My concerns is 

 if the 2 inch would be enough for both carbs. Has anyone else done this 

 with the 912-S and if so what size of tube did you use?

 

 Best Regards,

 

 Jeff R.

 A258 - N128LJ / Gold Rush 175 hours and climbing slowly cause this 

 winter if frickin could & wet for Tennessee ;o(. Must be al's global 

 warming!

 size  color="#000000" face="courier new,courier">

 href="http://www.matronics.com/Navigator?Europa-List">http://www.matronics.com/Navigator?Europa-List 

 href="http://www.matronics.com/contribution">http://www.matronics.com/contribution 

 

 

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cptimm(at)telus.net
Guest

Posted: Wed Jan 21, 2009 3:53 pm Post subject: Induction Air

Hi Jeff,

  

 I modified my Classic cowling early on, with a  starboard NACA inlet on the lower cowling, and started out with a 2" scat  tube

 to the plenum chamber. This turned out to be too  small for the 912S, and it became necessary to enlarge the inlet to  3".

 It enabled me ,however, with a home-made 3" to 2" Y  , to also supply air to 2 ball vents in the cockpit, as well as making the  engine happy.

  

 Peter Timm

 # ll0, Classic mono, 912S, 380 hrs

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

 [quote]   ---

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air.guerner(at)orange.fr
Guest

Posted: Thu Jan 22, 2009 4:26 am Post subject: Induction Air

Hi Jeff,

 I am using the optional Rotax airbox on my 912ULS.  The inlets of the airbox are designed for 60 millimeters diameter SCAT, one for  cold air and one for preheated air. I suppose Rotax have determined  that this diameter was necessary. On my installation, cold air is suplied by a  NACA on the left side of the cowl. You can see a picture of the cowl in my album  http://www.europaowners.org/modules.php?set_albumName=album196&op=modload&name=gallery&file=index&include=view_album.php

 I am very satisfied with this installation which  allows straightforward controllable carb heat. However there is one  inconvenience worth to mention: I consistently see induction air temperature  (measured inside the airbox) which is 6 degrees Celsius higher than OAT. This is  due to the length of SCAT ducting between the NACA intake, the filter box and  the aluminum airbox, all that stuff  being heated by the hot air inside the  cowl. Those 6 degrees may reduce power by up to 2%. The Europa XS airbox is  better on this point of view, as it takes the air directly from above and  induction temperature probably equals OAT. 

 Regards

 Remi Guerner

 F-PGKL

  

  

  

  

 Induction Air



Hi All,

While I have Gold Rush in for  the winter annual I'm considering some 

cowl changes. Including closing off  the upper NACA use for induction 

air on the 912-S and using the lower  starboard NACA normally used for 

the 914 induction. I seem to remember  someone else using that for carb 

intake and under cowl carb heat. I'm going  to use the same air plenum 

with the same filter as now but I will fabricate  a side intake to 

attach to the top of the plenum and a 2 inch scat tube  coming up from 

the below NACA. My question is this. I already have the inlet  plumed 

for this 2 inch tube and not a lot of room to increase it to 3 inch.  My 

concerns is if the 2 inch would be enough for both carbs. Has anyone  

else done this with the 912-S and if so what size of tube did you  use?



Best Regards,



Jeff R.



    [quote][b]

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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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