Engine Bearing Air Scoops

[Henderson,Eric]

The laser temp gauge lets you measure the crankcase and head temps. with the engines running.

I have scoop and non scoop configurations. The air scoop versions run cooler (Around 70-80F) and in the case of 4-c's have shown 200 rpm increases. In the case of 2-c's I got better bearing life. Much less rusting and wearing out prematurely. Hard to tell on power but did not lose any.

Regards,

Eric. 

-----Original Message-----
From: discussion-request at nsrca.org
[mailto:discussion-request at nsrca.org]On Behalf Of Jerry Budd
Sent: Tuesday, June 24, 2003 10:20 AM
To: discussion at nsrca.org
Subject: Re: Engine Bearing Air Scoops


>In a message dated 6/23/2003 7:01:23 PM Eastern Daylight Time, 
>patterndude at attbi.com writes:
>
>>Subj:Re: Engine Bearing Air Scoops
>>Date:6/23/2003 7:01:23 PM Eastern Daylight Time
>>From:<mailto:patterndude at attbi.com>patterndude at attbi.com
>>Reply-to:<mailto:discussion at nsrca.org>discussion at nsrca.org
>>To:<mailto:discussion at nsrca.org>discussion at nsrca.org
>>Sent from the Internet
>>
>>
>>
>>Randy,
>>Be careful of your info.  That may appear true in cooler areas, but in TExas
>>the WEbras can't be idled long on the ground or they will over heat and die. 
>>Then it takes a long time for them to cool enough to run them.  It is common
>>for owners to keep the engine at mid throttle while walking it out to the
>>runway just to keep it cool before takeoff.  THis is not necesarily a major
>>problem as long as you deal with it.
>>
>
>
>Geez Lance,
>
>maybe my Webra doesn't know it's a webra then. Mine will idle as 
>long as I want in sunny FLA in the summer heat. And have flown it in 
>"cold" weather also (45 deg) and it does fine; I change nothing to 
>the cooling set-up of the engine.
>
>It's not north TX for sure but is close to south TX


Same here in the California Mojave desert.  I've flown in over 100 
degree heat and had no problems.

I think using air scoops to provide cooling air to the lower case 
doesn't so much do that but could possibly result in a slight 
increase in base pressure in that area of the cowling.  That might 
allow the airflow to more easily flow around the head instead of 
seeking a low pressure area elsewhere in the cowling.  And if that's 
the case, using cylinder head baffles would work a lot better.  This 
would likely be more a prevalent problem in planes with oversize 
cowls such as the Gator G-202, Smaragd, Excellence, etc. (I don't 
know about an Aries, I've never seen one).

I know that when I land my carb/spinner are cool and sometimes even cold.

Jerry



-- 
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Jerry Budd
mailto:jbudd at qnet.com
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