webra 160 - meticulously clean

Tue Oct 19 06:40:05 AKDT 2004

Hi Tony,

I hope you are doing well in Phoenix.  I purchased and used the Johnson 
header that Central sells and used it at the 23.5" dimension.  The engine 
ran perfectly on the ground, but did not idle down in flight, or for 
landing, like the 160 I have on the MACs setup (24.25" to first baffle). 
This header broke within less than 10 flights.  The pipe portion broke 
cleanly off around the weld joint.  In a bind (right before the Apopka 
contest), I went to a marine store and had them re-weld the header.  After 
the repair, the header broke again (6 or so flights), but this time about 
1.0" above the weld. I then ordered the MACs header as I have used 
previously on 1.45s and one 160.  Central hobbies was very gracious and 
replaced the Johnson header with a Hatori steel header, which at this 
point I have not used.  The Hatori is shorter than the Johnson header. 

Then, the old and much used MACs header I had on the Lazuite broke!  Good 
thing I ordered two MACs headers.  At this point each MACs header has been 
working fine.  Jim Ivey, Ken B., and I bent one of the MACs headers the 
night before the Apopka contest in the hotel room by blocking the header 
in certain positions and using a hammer ting it in place.  Actually, it 
doesn't look that bad, fits perfectly, and definitely beats trying to use 
a torch to heat up the header and then bend somehow (which we tried at 
first).

Thanks,
Jim W.

"Tony Quist" <quist23 at cox.net>
Sent by: discussion-request at nsrca.org
10/19/2004 10:21 AM
Please respond to discussion

        To:     <discussion at nsrca.org>
        cc: 
        Subject:        RE: webra 160 - meticulously clean

Jim,

Are you running the Johnson header that Central Hobbies sells?  If so what 
length are you running it.  I saw that Matt K was running 24 inches to the 
first baffle.  My header at full length only gives me 23.5 inches.

I have test run the engine and there are leaks where you say.  I will rtv 
the areas and put hose clamps on the coupler.

Tony Quist

-----Original Message-----
From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org] On Behalf Of Jim_Woodward at beaerospace.com
Sent: Tuesday, October 19, 2004 7:09 AM
To: discussion at nsrca.org
Subject: RE: webra 160 - meticulously clean

I installed one headshim in the two Webra 160 (Aggressor and Lazulite).  I 
did not notice any difference in running, nor a compression reduction.   

Also, I've gotten mine to be meticulously clean while running.  After a 
day's flying, there is almost no need to clean the plane.  Simple, but 
with some routine checks here are the steps: 
1.  Use RTV between the header and engine (check or redue once a month if 
residue develops on plane) 
2.  Ensure all bolts are tight (no lie) (engine will still run with loose 
headbolt) 
3.  Header & Pipe coupler:  I found zip ties to not adequately seal the 
silicone coupler.  For instance, if you examine the plane and there is 
exhuast residue on the plane before the stinger, then you have a leak 
somewhere.  After installing small hose clamps, and checking every so 
often, there is no "exhaust" residue before the actual exhaust stinger. 
4. Pinch or disconnect fuel line:   If you pinch the fuel line in between 
flights, or just plug the line, there will be little to few fuel drops 
exiting the carburetor while the plane is sitting.   
5.  Run exhaust stinger extension: 

Thanks, 
Jim W.

"Joe Lachowski" <jlachow at hotmail.com> 
Sent by: discussion-request at nsrca.org 
10/19/2004 09:52 AM 
Please respond to discussion 

        To:        discussion at nsrca.org 
        cc:         
        Subject:        RE: webra 160

Motor does not come with head shim. Got 3 motors that way. I haven't had a 

need to use them either.

>From: "George Kolotouros" <georgeman4 at cox.net>
>Reply-To: discussion at nsrca.org
>To: <discussion at nsrca.org>
>CC: "George Kolotouros" <georgeman4 at cox.net>
>Subject: webra 160
>Date: Mon, 18 Oct 2004 18:54:56 -0700
>
>Hello everyone, been having some problems with my new webra. I finally 
have 
>the proper length on my es 160 pipe. 24in from plug to first
>baffle. played with the mixture. Put it in the air. High speed is lean
>richened it a few % on my radio. Later when I got home I decided to pull 
>the head to look at the top of the piston. Looks fine, found out I dont 
>have a head gasket. There parts breakdown shows that ther is one. What 
>gives? George Kolotouros

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