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03-05-2013, 07:57 PM
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Join Date: Nov 2005
Location: Snohomish, Washington
Posts: 699
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Quote:
Originally Posted by LifeofReiley
This change happened after the install? Seem like you're in slow cruise mode? 
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No, cooling has always been marginal. It's a Sam James cowl and plenum.
I left too much spinner gap and think it's pressurizing the lower cowl. I have the baffles tight and sealed up. It was actually worse before the mod was installed. Wheel pants will fix the speed 
__________________
Don Jones
Technical Support Manager
Dynon Avionics
CFI-IA, AGI, IGI
RV9-A
Last edited by Don Jones : 03-06-2013 at 01:09 AM.
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03-05-2013, 08:48 PM
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Join Date: Jan 2005
Location: MN
Posts: 2,269
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Carb heat?
Hi Don,
This is very interesting - I had similar issues until I started playing with Carb heat - I know your airbox set up is different, but it might be worth exploring. I "think" my carb heat sets up turbulence in the the airflow that helps balance the mixture - the heat might help atomize the fuel, too.
I run LOP almost all the time with carb heat fully or partially on. 150+KTAS on 6GPH at 7500. I love it!
My only concern would be if the grid breaks up and gets sucked up. That said, I love the innovation! Good luck!
__________________
Cheers,
Pete
Amateur Plane - RV-9A N789PH - 2350+ Hrs
Amateur Radio - KD0CVN
Doggies Delivered - 25+
St. Paul, MN
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03-05-2013, 09:18 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Quote:
Originally Posted by billnaz
You may have a game changer here if your results are repeatable. I'd given up on anything close to lean of peak with my carb'd 0360. I'd understood that the problem with fuel distribution in carbs was uneven fuel mixing down stream from the venturi. How does this straightener effect that? Any expert opinions?
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Install dual electronic ignition and you can run LOP with a stock LOP w/o carb heat.
I typically run my O-360 this way with no issues and get between 100 and 50* LOP.
Now to try this mod and see how that improves things.
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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03-05-2013, 09:45 PM
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Join Date: Mar 2008
Location: Seattle
Posts: 1,412
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If the grid breaks up and gets sucked it, then the material and thickness would be significant.
Thin aluminum hex would probably break up, get sucked into the cylinder, smoosh around and fly out the exhaust without much damage...
If made of steel, it still might break up, but once inside the cylinder, could do more damage.
On the other hand, the material used in mass airflow sensors is proven to NOT break up, so there is value in that approach.
One thing for sure; on a single engine plane, the big fan must not stop until you say so!!
__________________
Scott Emery
http://gallery.eaa326.org/v/members/semery/
EAA 668340, chapter 326 & IAC chapter 67
RV-8 N89SE first flight 12/26/2013
Yak55M, and the wife has an RV-4
There is nothing-absolute nothing-half so much worth doing as simply messing around with Aeroplanes
(with apologies to Ratty)
2019
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03-06-2013, 05:11 AM
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Join Date: Oct 2005
Location: 08A
Posts: 9,500
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Don,
Have a micrometer handy? Can you measure the thickness of the aluminum cell wall?
__________________
Dan Horton
RV-8 SS
Barrett IO-390
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03-06-2013, 07:44 AM
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Join Date: Nov 2005
Location: Snohomish, Washington
Posts: 699
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Quote:
Originally Posted by DanH
Don,
Have a micrometer handy? Can you measure the thickness of the aluminum cell wall?
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I will have to find some of the scrap or measure next time I have the thing in my hand. Just a guess, but it's around .005 or so.
__________________
Don Jones
Technical Support Manager
Dynon Avionics
CFI-IA, AGI, IGI
RV9-A
Last edited by Don Jones : 03-06-2013 at 07:47 AM.
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03-13-2013, 08:54 PM
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Join Date: Sep 2007
Location: Los Angeles CA
Posts: 25
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Bump
Don-
Great work! Got any pics of your airbox, and the installed straightener?
Thanks,
Craig
__________________
Donated 2013.
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03-13-2013, 09:53 PM
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Join Date: Apr 2011
Location: Cincinnati, OH
Posts: 2,791
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how about polyimide honeycomb?
http://www.hexcel.com/Resources/Data.../HRH327_us.pdf
high temp, fatigue resistant
if it does get sucked up, minor damage
__________________
Steve Melton
Cincinnati, OH
RV-9A, Tip-up, Superior O-320, roller lifters, 160HP, WW 200RV, dual impulse slick mags, oil pressure = 65 psi, EGT = 1300F, flight hours = 800+ for all
Simplicity is the art in design.
My Artwork is freely given and published and cannot be patented.
www.rvplasticparts.com
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03-13-2013, 11:17 PM
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Join Date: Nov 2005
Location: Snohomish, Washington
Posts: 699
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Quote:
Originally Posted by Steve Melton
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Looks like a good choice. Wonder how expensive and what quantities it can be bought?
__________________
Don Jones
Technical Support Manager
Dynon Avionics
CFI-IA, AGI, IGI
RV9-A
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03-13-2013, 11:24 PM
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Join Date: Nov 2005
Location: Snohomish, Washington
Posts: 699
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Quote:
Originally Posted by BD4Guy
Don-
Great work! Got any pics of your airbox, and the installed straightener?
Thanks,
Craig
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I don't have pics right now. I am actually working on a replacement for the airbox. I am replacing it with a piece of 3" mandrel bent aluminum tubing. It should clean up the air entering the carb even more. I will post more info and pictures as my experiments progress. I just finished painting the wheel pants so I can get them on this weekend. I will also post some before and after engine monitor graphs when I get a chance. I have been working on cooling. It's still running warmer than I would like in cruise and climb. It's been like that since before the carb air straightener. The straightener evened the temps out, but hasn't lowered them, well not much anyway.
__________________
Don Jones
Technical Support Manager
Dynon Avionics
CFI-IA, AGI, IGI
RV9-A
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