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alternate air/bypass air on fuel injection

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Lew Gallagher

Joined: 04 Jan 2008
Posts: 402
Location: Greenville , SC

Posted: Thu Dec 08, 2011 4:27 am Post subject: alternate air/bypass air on fuel injection

Hey guys,



I need some pilot input here.  I'm helping an RV-8 builder on his cowl intake and airbox. He has a fuel injected four cylinder engine -- same setup as the -10.   He says Van's instructions call for a bypass door on the bottom AND and alternate door in the "snout" of the box (allows engine compartment air to be filtered instead of snorkle air).  On Wes's RV-10 we only installed the emergency door on the bottom.  The thought is  that with fuel injection there is not the icing problem as with a carburated engine ...?



It seems to me that it would be redundant to have two doors (and more gizmos/messier install/things to mess up, etc.) if the reason to have the snout door is to "pull in warm cowling air to defrost the filter" -- if you had ice, bird strike, debris, whatever in through the cowl snorkle, wouldn't you have to open the bypass door anyway?



Are others really installing two doors?  Obviously I'm just the hired help, his plane, he's the pilot, etc. but I'd like some experienced input.



Thanks, - Lew



And congrats, Matt on the quick fix.  Happy holidays to all!

- The Matronics RV10-List Email Forum -

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_________________
non-pilot
crazy about building
NOW OFICIALLY BUILDER #40549
Fly off completed !

coop85(at)verizon.net
Guest

Posted: Thu Dec 08, 2011 7:53 am Post subject: alternate air/bypass air on fuel injection

Lew,

   If I remember correctly (to be honest it's been awhile and I could be mistaken), my RV-6 had the alternate "snout door" as you mentioned and I had a fuel injected engine.  However there was not the bottom door, only one alternate air source.  I agree that 2 would be excessive.  If I had to choose, I'd go the RV-10 route as it bypasses the filter and worst case scenario something clogs the filter in addition to the intake.



Marcus



40286

do not archive

On Dec 8, 2011, at 7:27 AM, Lew Gallagher wrote:






Hey guys,



I need some pilot input here.  I'm helping an RV-8 builder on his cowl intake and airbox. He has a fuel injected four cylinder engine -- same setup as the -10.   He says Van's instructions call for a bypass door on the bottom AND and alternate door in the "snout" of the box (allows engine compartment air to be filtered instead of snorkle air).  On Wes's RV-10 we only installed the emergency door on the bottom.  The thought is  that with fuel injection there is not the icing problem as with a carburated engine ...?



It seems to me that it would be redundant to have two doors (and more gizmos/messier install/things to mess up, etc.) if the reason to have the snout door is to "pull in warm cowling air to defrost the filter" -- if you had ice, bird strike, debris, whatever in through the cowl snorkle, wouldn't you have to open the bypass door anyway?



Are others really installing two doors?  Obviously I'm just the hired help, his plane, he's the pilot, etc. but I'd like some experienced input.



Thanks, - Lew



And congrats, Matt on the quick fix.  Happy holidays to all!



--------

non-pilot

crazy about building

NOW OFICIALLY BUILDER #40549

Fly off completed !





Read this topic online here:



http://forums.matronics.com/viewtopic.php?p=360443#360443

- The Matronics RV10-List Email Forum -

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:

http://www.matronics.com/Navigator?RV10-List

flysrv10(at)gmail.com
Guest

Posted: Thu Dec 08, 2011 7:54 am Post subject: alternate air/bypass air on fuel injection

Installed one door only per vans published instructions. 



Do not archive. 



Rob Kermanj

Sent from my iPhone



On Dec 8, 2011, at 7:27 AM, "Lew Gallagher" <lewgall(at)charter.net> wrote:



 	  Quote: 	
		   

 

 Hey guys,

 

 I need some pilot input here.  I'm helping an RV-8 builder on his cowl intake and airbox. He has a fuel injected four cylinder engine -- same setup as the -10.   He says Van's instructions call for a bypass door on the bottom AND and alternate door in the "snout" of the box (allows engine compartment air to be filtered instead of snorkle air).  On Wes's RV-10 we only installed the emergency door on the bottom.  The thought is  that with fuel injection there is not the icing problem as with a carburated engine ...?

 

 It seems to me that it would be redundant to have two doors (and more gizmos/messier install/things to mess up, etc.) if the reason to have the snout door is to "pull in warm cowling air to defrost the filter" -- if you had ice, bird strike, debris, whatever in through the cowl snorkle, wouldn't you have to open the bypass door anyway?

 

 Are others really installing two doors?  Obviously I'm just the hired help, his plane, he's the pilot, etc. but I'd like some experienced input.

 

 Thanks, - Lew

 

 And congrats, Matt on the quick fix.  Happy holidays to all!

 

 --------

 non-pilot

 crazy about building

 NOW OFICIALLY BUILDER #40549

 Fly off completed !

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=360443#360443

- The Matronics RV10-List Email Forum -

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:

http://www.matronics.com/Navigator?RV10-List

n223rv(at)wolflakeairport
Guest

Posted: Thu Dec 08, 2011 8:46 am Post subject: alternate air/bypass air on fuel injection

The front hinged cable operated door door is for carb heat.  If you are fuel injected, you don't need it.  The lower door is the filter bypass/alternate air door, used on case the filter becomes plugged.



-Mike Kraus



Sent from my iPhone



On Dec 8, 2011, at 7:27 AM, "Lew Gallagher" <lewgall(at)charter.net> wrote:



 	  Quote: 	
		   

 

 Hey guys,

 

 I need some pilot input here.  I'm helping an RV-8 builder on his cowl intake and airbox. He has a fuel injected four cylinder engine -- same setup as the -10.   He says Van's instructions call for a bypass door on the bottom AND and alternate door in the "snout" of the box (allows engine compartment air to be filtered instead of snorkle air).  On Wes's RV-10 we only installed the emergency door on the bottom.  The thought is  that with fuel injection there is not the icing problem as with a carburated engine ...?

 

 It seems to me that it would be redundant to have two doors (and more gizmos/messier install/things to mess up, etc.) if the reason to have the snout door is to "pull in warm cowling air to defrost the filter" -- if you had ice, bird strike, debris, whatever in through the cowl snorkle, wouldn't you have to open the bypass door anyway?

 

 Are others really installing two doors?  Obviously I'm just the hired help, his plane, he's the pilot, etc. but I'd like some experienced input.

 

 Thanks, - Lew

 

 And congrats, Matt on the quick fix.  Happy holidays to all!

 

 --------

 non-pilot

 crazy about building

 NOW OFICIALLY BUILDER #40549

 Fly off completed !

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=360443#360443

- The Matronics RV10-List Email Forum -

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:

http://www.matronics.com/Navigator?RV10-List

Dick Sipp

Joined: 11 Jan 2006
Posts: 215
Location: Hope, MI

Posted: Thu Dec 08, 2011 7:08 pm Post subject: alternate air/bypass air on fuel injection

I think you hit the nail on the head.  I only installed one door.



Dick Sipp

RV-10



--

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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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