OS 1.60 Issues

[Rcmaster199 at aol.com]

Jon, I am using the same set-up as Karl with excellent results with this 
sport engine. The only thing different on mine is the prop (bigger) and slightly 
longer on the pipe. The idle is easy to get lean: symptoms are extended time to 
settle down to low rpms for landing. I had to back mine off about 1/2 turn 
from where it gave me that symptom, and it works really well now. 

The only negative on this topper tank set-up is the first start of the day on 
the inverted engine--choking it tends to be tough because of minimal prop 
clearance. I hate starters so getting fuel to the carb can be tricky, but once 
it's there, a quick flip of the spinner against compression and she's kicked off

Matt K


> Subj:Re: OS 1.60 Issues 
> Date:6/1/2004 10:31:42 AM Eastern Daylight Time
> From:kgamueller at rogers.com
> Reply-to:discussion at nsrca.org
> To:discussion at nsrca.org
> Sent from the Internet 
> 
> 
> 
> Re O.S. 160FX issues.
>  
> Engines with remote needle valves don't like to run with pumps or regulators 
> very well. I went through all of these setups and none were satisfactory.
> This is the least troublesome setup. No pump or regulator or check valve.
> I have my two engines running and pulling better than a DZ.
> The speed is actually too fast and I have to try to load them up with more 
> prop.
> At the moment I am using a 16.5 x 12 APC.  A heavier prop might change the 
> pipe length a little. 
> I'm using a 3" header extension between my header, which meassures
> about 6" straight back from the glow plug, to a Mac's 15cc quiet pipe. 
> I also did some mod's on the exhaust timing to allow for running on the
> pipe. A 4oz header (or hopper ) tank behind the firewall, which I use on all 
> 
> setups now, and the main tank just in front of the wing tube. Had to move it 
> down
> on the floor of the fuselage because of siphoning. Pressure line from the 
> high
> point of the pipe into the main tank. Good idle and midrange as well as 
> transition
> to high speed.  Actually too much power.
> But than again too much is just enough!!!
>  
> Karl G. Mueller
> kgamueller at rogers.com
> 
>  
> 
> >> ----- Original Message ----- 
>> From: JonLowe at aol.com 
>> To: discussion at nsrca.org 
>> Sent: Tuesday, June 01, 2004 8:09 AM
>> Subject: OS 1.60 Issues
>> 
>> 
>> I have a Titan, OS 1.60, Mueller header, Greve pipe, Ironbay regulator 
>> before the needle valve, OS #8 plug, running a 17x13 with 15%.   Tank is monted 
>> over the CG.  Hyde mount.  As near as I can measure around the header, I am 
>> at the length that Piedmont recommends for these pipes on their site.  Good 
>> power at full throttle, but midrange stinks, wanting to load up at 3/4 
>> throttle, and not transition to full throttle.  Also, the mixture changes in the 
>> air, upright to inverted, going rich inverted.  I have the regulator mounted 
>> horizontally about 1.5 inches from the needle, do I need to mount it 
>> fore-aft like a Cline?  Do you think I need to extend the length of the pipe?  Any 
>> carb adjustment tricks?  I'm new to pipes, so any info will help.
>>  
>> BTW, the original  pressure check valve went bad before I even got to fly 
>> it.  I got a check valve (Foremost) from my local hobby shop that seems to 
>> work, developing pressure and holding it well.  Have others had problems with 
>> the Ironbay valves?
>>  
>> Thanks.
>>  
>> Jon Lowe
>> 
>> 
> 

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