Air filter size & clearance
Posted: Sun Dec 15, 2013 12:20 am
by mike.smith
I was planning to use the larger air filter on the left, but when I try to put on the lower cowl it is WAY too tall and the cowl hits the filter before it ever comes close to closing up.
http://www.mykitlog.com/users/display_l … 3043&row=2
I either have to build a blister in the cowl to fit around the filter, or I have to use the shorter filter. I am afraid the shorter filter will not provide enough air flow to the carb. At least that is what I seem to remember in discussions over the years.
Does anyone have any input or thoughts? I don’t mind building the blister if I have to, but maybe the shorter filter is OK?
Mike Smith
Re: Air filter size & clearance
Posted: Sun Dec 15, 2013 12:50 am
by MichaelFarley56
I used that short filter for a while and had no issues with it. After a while, I switched to a K&N of the exact same size. I can’t remember the size, but a search on the yahoo forums will bring up the correct number. I seem to recall it’s an E-3120 but I’m not positive. Either way they work fine. like you said, any larger of a filter and you’ll have to modify the cowling, which I had no interest in doing.
Re: Air filter size & clearance
Posted: Sun Dec 15, 2013 1:55 am
by daleandee
Re: Air filter size & clearance
Posted: Sun Dec 15, 2013 2:25 am
by mike.smith
So for Mike and Dale, you thought the smaller (shorter) filter was adequate and did not choke off air volume?
Mike Smith
Re: Air filter size & clearance
Posted: Sun Dec 15, 2013 3:21 am
by daleandee
Re: Air filter size & clearance
Posted: Sun Dec 15, 2013 7:31 am
by Onex77
While tuning my Aerovee engine I found the stock paper filter and the K&N filter E-3120 restricted air flow. Like several other builders with Aerovee engines I installed a K&N RC-1980. To prove this out run your engine with your current filter then without,see how much your max takeoff RPM increases. I believe you will see the need to increase fuel flow (adjust needle) during max RPM requirements such as takeoff. I’m currently running a #3 needle with excellent idle. It only took me about 60 hours of flying the Aerovee to fiqure this out. I have a like new E-3120 and Aerovee filter assembly if some one needs I will make them a deal.
Brent
Onex #77
Re: Air filter size & clearance
Posted: Sun Dec 15, 2013 9:50 am
by MichaelFarley56
Hi Brent,
How did you fit that filter under your cowling? I know I barely have enough room with the stock setup. Does the bigger filter rub the cowling at all?
Re: Air filter size & clearance
Posted: Sun Dec 15, 2013 12:36 pm
by mike.smith
Thanks everyone. I’m going to try the K&N E-3120 since that seems to be working for most everyone. It was only $27 on Amazon with free shipping.
Mike Smith
Re: Air filter size & clearance
Posted: Sun Dec 15, 2013 1:21 pm
by Onex77
Same thickness as E-3120 filter,oval shape, twice the surface area so less air restriction. This only matters on takeoff, full power. I just clamp my RC-1980 filter to Aeroinjector inlet.
Re: Air filter size & clearance
Posted: Sun Dec 15, 2013 9:33 pm
by daleandee
Re: Air filter size & clearance
Posted: Sat Aug 27, 2022 5:37 pm
by Bryan Cotton
My RC-1980 met its demise. Safety your filter!
So I’m playing with another option, a K&N RD-0720 and a silicone 2.25" elbow:
https://www.amazon.com/AUTOHAUX-Silicon … B09DGMYXLH
RC-1980 has 31.7 square inches. The RD-0720 has 66 square inches.
Re: Air filter size & clearance
Posted: Mon Sep 05, 2022 1:38 pm
by Bryan Cotton
I screwed/riveted this thing on the air filter end for safety wire.
Inside there is backup for the screws. It was too long for rivets.
The tube jams nicely into the filter. Still it could work out, so I put 4 little brass flush screws around the perimeter.
The hose clamp keeps them captive.
I tie-wrapped a short piece of fuel line on the X of the motor mount, and ran a safety wire bridle through it - from the tab I riveted onto the end to the hose clamp.
Re: Air filter size & clearance
Posted: Mon Sep 05, 2022 10:24 pm
by Bryan Cotton
Here is a picture from the front, showing the clearance on the exhaust. In hindsight, one of those cone shaped filters would have been better for clearance on the exhaust.
