OS 1.60 Issues

[JonLowe at aol.com]

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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