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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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 Posted: Thu Dec 09, 2010 3:44 pm Post subject: FYI on airbox's |
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This is a copy of a post from the www.ctflier.com website. It is a good FYI about airboxes. Jeremy is a good friend and very knowledgeable, plus he has been to the Rotax factory to get qualified for "Overhaul" on the Rotax.
Jeremy(at)CPS
Advanced Member
Group:Members
Posts:10
Joined:19-June 10
LocationTracy CA
Posted Today, 02:16 PM
Only about 10% of the slsa mfgs use the tuned aurbox and even fewer of the experimental's even mention it in there construction Manual. The idea is to stabilize the airflow between booth carbs by first running all intake air into a single filter and then ensuring that both carbs are having identical airpressure entering the venturi. This set up translates to a smoother running engine and thus in turn increases power very slightly. The other added advantage is the ports for the floatbowl vent lines. This ensures even pressure on the fuel in the bowls and allows for more even EGTs. These are two features that FD attempted to copy on the early SWs and there system works well enough.
Exhaust however is more critical. The power an engine can produce is heavily dependant on the amonut of back pressure the exhaust imposes on the cylinder. Too much pressure and the engine will choke down and lose power. Not enough pressure (which is the case in most twin exh. Setups) and you risk burning exh valves becuase the fuel is still burning as it leave the combustion chamber rather than burning completely inside.
The same principle with smooth running applies to the intake are along with the exhaust air exiting. (equal pressures= smoother operation and less oposition the engine had to throttle response.)
A&P
FCCL
Sport Pilot
ROTAX MECHANIC -912 OVERHAUL RATED
Technical Director & Rotax Warranty Rep. for California Power Systems
Nor-Cal Emergency Field Services, LLC -Owner
(209)481-5881 Cell
(510)247-9653 CPS Shop Mon-Fri
Nor_Calefs(at)Yahoo.com
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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056 |
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craig(at)craigandjean.com
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| Posted: Thu Dec 09, 2010 4:02 pm Post subject: FYI on airbox's |
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The other (theoretical) advantage to an airbox (when compared to the usual
pair of filters drawing warmer air from inside the cowl) it that you are
drawing outside, cool air which translates to more power. How much is an
open question. In conventional engines applying carb heat causes a drop in
power. But I doubt the under cowl air is as hot as air drawn from a shroud
around the muffler.
-- Craig
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