fbpx
Login

 

Jump to Forum..

Air filters

in General Tech Discussion 9 years ago

  • Re: Air filters

    by » 9 years ago

    "Providing you have properly sized inlet ram air openings and more importantly outlet openings"

    Your sentence here says it all.


    The top of the engine area is the warmest point and the #3-#4 exhaust are right under the air intakes for an air filter mount on the carb.
    heat stays in quite a bit and that's most likely why Vans has a very high incident rate of VR failures because of their location under the cowl and that's why they approved a relocation to inside the cockpit.
    Open air engines tend to run too cool and dump a lot of heat due to no cowling, but there are many that run hotter and can overheat with a cowl at 100 mph.

    Your sentence still says it all. Each plane is different.

    Not so much as a matter of the air heating up, but not as much air moving through as you may think. Cowls and their openings play a huge part here. Baffling that people put in usually doesn't direct the airflow many times where they think and sometimes actual hinder the flow. The only way to know this is a smoke flow test.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell

      
    Report

  • Re: Air filters

    by » 8 years ago

    Hi guys,
    I was curious myself what the temp difference actually was on my C42A (80hp). So I installed an arduino temp logger to messure outside temp with one sensor and the temp of the air flowing through the filter fitted right at the carb.
    During normal flight the temp difference floats around 5 Celsius. Whole crusing it never reached a double digit level.
    Only after long full throttle steep climbs temp difference got to 15 to 17 Celsius.
    Of course this is only true data for this particular installation and Cowling but it proves the point that "it's less than one would think".
    If dashing about with absolute max rev and power was "the standard to look at" we would loose approx 8% of power. Or we'd be able to save about 1,5 l of gas per hour, theoretically speaking.
    Practically I didn't care enough to change anything.
    Regards
    Peter
      
    Report
You do not have permissions to reply to this topic.
Related Topics
Title Category Replies
Replacement K&N air filter part number? 915iS Technical Questions 4
Rotax 912 80hp Is the gascolator on my airplane enough of a fuel filter 912 / 914 Technical Questions 20
Best jets for 914 in open air 912 / 914 Technical Questions 1
Service Bulletin: Inspection and maintenance after an overload clutch slipping event on ROTAX® 915 i and 916 i (Series) Aircraft Engines 915iS Technical Questions 6
Mechanical Fuel Pump & High Wing Aircraft 912 / 914 Technical Questions 2
Follow Us

Recent Videos

Safety First!

 

To receive critical-to-safety information on your ROTAX Engine, please subscribe to
ROTAX-OWNER.COM

Prize Giveaway!


SUBSCRIBE NOW
to automatically enter this years draw!

Login