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Old 08-04-2018, 01:09 AM
crashley crashley is offline
Join Date: Jun 2009
Location: hazelwood north vic
Posts: 170
Default carby air intake

The RV12 takes is inlet air from under the cowls I have measured this and it is varies from about 40 to 60 degrees celcius ( 100 to 140 fahrenheit) I believe we could get a bit more power with a colder air inlet
Has anyone designed a cold air intake system to suit the RV12
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Old 08-04-2018, 08:19 AM
DHeal DHeal is offline
Join Date: Sep 2006
Location: Windsor, California
Posts: 803

It is my understanding that the warm air within the cowling is an important factor in reducing the potential for carb icing within the two CV carbs. Since there is no additional "carb heat" available for these carbs, it would seem that the ambient heat within the cowling is pretty important.

If you were to install a "cold air" intake system for the carb air some form of effective carb heat would be required. I suppose this carb heat could be provided via a traditional mixer valve set-up or either the electric or water coolant jacket options.

IMHO, not worth the added mechanical complexity and the minimal increase in power -- if any.

ps -- My old Mooney had the Ram Air option which provided an inch or so of additional MP when activated. I suppose one could rig up something like that -- system complexity and minimal benefit again being issues.
David Heal - Windsor, CA (near Santa Rosa)
EAA #23982 (circa 1965) - EAA Technical Counselor and Flight Advisor; CFI - A&I
RV-12 E-LSA #120496 (SV w/ AP and ADS-B 2020) - N124DH flying since March 2014 - 780+ hours (as of June 2019)!
VAF donation through June 2020.

Last edited by DHeal : 08-04-2018 at 08:43 AM.
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Old 08-04-2018, 11:05 AM
Piper J3's Avatar
Piper J3 Piper J3 is offline
Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 1,404

I wouldn't pressurize the carb with ram air. The Bing is a constant velocity design with benefit of altitude compensating mixture. Pressure would do bad things.

As it is, my 12 will out climb a C172 Skyhawk any day of the week regardless of how either plane is loaded. The 12 will also outpace a lightly-loaded Cherokee 180 running at 65% power. Loving it...
Jim Stricker
Hinckley, Ohio (1OA2)
EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
RV-12 E-LSA #120058 AWC July 2012 N633CM
RV-12 Bought Flying Oct 2015 with 48TT - Hobbs now 443

LSRM-A Certificate 2016
Special Thanks... EJ Trucks - Crew Chief A-4 Skyhawk
and MJ Stricker (CFI) - 1st Lt. Captain B-17H
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