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  #41  
Old 03-18-2013, 05:52 PM
BD4Guy BD4Guy is offline
 
Join Date: Sep 2007
Location: Los Angeles CA
Posts: 25
Default Airbox Picture

Don-

Is the current airbox the one pictured in your thread about getting the airplane's pink slip?

Thanks,

Craig
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  #42  
Old 03-18-2013, 07:35 PM
Don Jones's Avatar
Don Jones Don Jones is offline
 
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Location: Snohomish, Washington
Posts: 699
Default

Quote:
Originally Posted by BD4Guy View Post
Don-

Is the current airbox the one pictured in your thread about getting the airplane's pink slip?

Thanks,

Craig
Yes, it is.
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  #43  
Old 03-29-2013, 11:34 AM
badmrb badmrb is offline
 
Join Date: Oct 2009
Location: Pomona, ks
Posts: 77
Default Honeycomb source

I found this thread extremely interesting and have been thinking about giving it a try my next annual when I pull everything apart. The posted results were pretty impressive.

Im running an O-360 and have found I can run LOP at some low power settings but never any higher. Right now for putting around depending on the day I'll run 2000 to 2150 rpm and can run LOP down to 4.5gph to maybe 5gph and still do 120kts to 135kts. Great for just boring holes. It would be nice to expand that LOP window some.

I ordered some honeycomb to try from www.saxonpc.com

I saved my old airbox plate that was cracking so I have a perfect template to try and make a couple different versions. The one round piece with the small honeycombs is just how I received it. FIts perfectly. Its the default one on their site for MAF. It was $12.48.

The second, larger one I ordered at 120mm and 1/2in thick. It was $9.85. Just to try a larger honeycomb and maybe compare results down the road.

With shipping it was 26.52 total! for two different pieces to try. Ive got some left over plate from the replacement airbox plate I made and I've got some proseal that should still be good from resealing the fuel sending units last year.


I wont be installing one for months but just thought I'd share a good source in case anyone else was thinking of making one.







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  #44  
Old 03-29-2013, 12:22 PM
Fred.Stucklen's Avatar
Fred.Stucklen Fred.Stucklen is offline
 
Join Date: Oct 2006
Location: Brooksville, FL
Posts: 356
Default LOP with a Carb

I'll venture to say that you would have similar LOP results when running the throttle wide open at high altitudes (without the honeycone). Let us know the results after you run with the honeycone, especially when running around the 2250 RPM area at lower altitudes. I think that is where you will see the greatest help from the honeycone air straightener.


Quote:
Originally Posted by badmrb View Post
I found this thread extremely interesting and have been thinking about giving it a try my next annual when I pull everything apart. The posted results were pretty impressive.

Im running an O-360 and have found I can run LOP at some low power settings but never any higher. Right now for putting around depending on the day I'll run 2000 to 2150 rpm and can run LOP down to 4.5gph to maybe 5gph and still do 120kts to 135kts. Great for just boring holes. It would be nice to expand that LOP window some.

I ordered some honeycomb to try from www.saxonpc.com

I saved my old airbox plate that was cracking so I have a perfect template to try and make a couple different versions. The one round piece with the small honeycombs is just how I received it. FIts perfectly. Its the default one on their site for MAF. It was $12.48.

The second, larger one I ordered at 120mm and 1/2in thick. It was $9.85. Just to try a larger honeycomb and maybe compare results down the road.

With shipping it was 26.52 total! for two different pieces to try. Ive got some left over plate from the replacement airbox plate I made and I've got some proseal that should still be good from resealing the fuel sending units last year.


I wont be installing one for months but just thought I'd share a good source in case anyone else was thinking of making one.







Uploaded with ImageShack.us
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  #45  
Old 04-08-2013, 10:52 PM
SHIPCHIEF SHIPCHIEF is offline
 
Join Date: Mar 2008
Location: Seattle
Posts: 1,412
Default

Thanks for the ideas. I just got a Rotec throttle body, and I understand they benefit from inlet air straightening.
My Lycoming 4 banger has much higher EGT on cylinders 1 & 2, as many do. I understand the Ellison & Rotec units can provide better mixture distribution than the MA-4, so I went with it.
With the Marvel Shebler, I noticed more even exhaust temps when using carb heat and part throttle. Perhaps the heat & turbulence improved the mixture distribution with the updraft sump? I understand that this is not the way you are going but perhaps pre-Venturi straightening is valid like post Venturi mixing is, but greater power output should be expected using your techinque, if the honeycomb has negligible pressure drop...
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  #46  
Old 03-24-2014, 06:40 AM
pa38112 pa38112 is offline
 
Join Date: Mar 2008
Location: Clarksboro, NJ
Posts: 829
Default

It has been a while since anyone has posted an up-date on their results... Is the original honeycomb still in-service and working well? Have any of the other attempts shown similar improvement ? Please post if you have made this modification.

Thanks !
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  #47  
Old 03-24-2014, 09:50 AM
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Don Jones Don Jones is offline
 
Join Date: Nov 2005
Location: Snohomish, Washington
Posts: 699
Default

I still have mine in service. It is still working well, though I feel I need to upgrade to electronic ignition to consistently run it lean of peak. The honeycomb still looks like the day I put it in.
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Last edited by Don Jones : 03-24-2014 at 09:52 AM.
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  #48  
Old 03-24-2014, 06:26 PM
rv4ator rv4ator is offline
 
Join Date: Apr 2008
Location: Northern CA
Posts: 73
Default

I tried this set up on my -4 with 0-320 carb & did not find any difference at all with or without the honeycomb. Removed the honeycomb.
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  #49  
Old 03-29-2014, 03:01 AM
TIPSYNIPPER TIPSYNIPPER is offline
 
Join Date: Jan 2014
Location: Ardleigh, Essex, UK
Posts: 55
Default Progress please?

Hi Guys,
Thank you for those posting on this subject.
I have just bought an RV4 (O320 160hp) which I want to fit inverted systems to. Some Q's please?
1. Any further comment on carb' orientation (across or fwd/aft)?
2. Service difficulties/problems?
3. Suggestions?
4. Ellison or Rotec?
5. Mogas or Avgas?
Thanks in advance.
Neil
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  #50  
Old 03-31-2014, 09:26 AM
RV7AV8R's Avatar
RV7AV8R RV7AV8R is offline
 
Join Date: Feb 2005
Posts: 426
Default Inside the FAB

Quote:
Originally Posted by badmrb View Post
I found this thread extremely interesting and have been thinking about giving it a try my next annual when I pull everything apart. The posted results were pretty impressive.

Im running an O-360 and have found I can run LOP at some low power settings but never any higher. Right now for putting around depending on the day I'll run 2000 to 2150 rpm and can run LOP down to 4.5gph to maybe 5gph and still do 120kts to 135kts. Great for just boring holes. It would be nice to expand that LOP window some.

I ordered some honeycomb to try from www.saxonpc.com

I saved my old airbox plate that was cracking so I have a perfect template to try and make a couple different versions. The one round piece with the small honeycombs is just how I received it. FIts perfectly. Its the default one on their site for MAF. It was $12.48.

The second, larger one I ordered at 120mm and 1/2in thick. It was $9.85. Just to try a larger honeycomb and maybe compare results down the road.

With shipping it was 26.52 total! for two different pieces to try. Ive got some left over plate from the replacement airbox plate I made and I've got some proseal that should still be good from resealing the fuel sending units last year.


I wont be installing one for months but just thought I'd share a good source in case anyone else was thinking of making one.







Uploaded with ImageShack.us
Don put his air straightener between the carb and FAB but it seems inside the FAB would be an easier installation. You could mount it with a new set of bolts so as to not interfere with any of the original FAB installation. Any one try this? So far Don reports great success and an RV4 owner reports no effect. Any other updates?
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