Hi Guys,

I am putting an OS 160 in a Extreme Flight Yak (160 size) & want to place the fuel tank as close to the CG as possible. The distance from the tank plug to the carb. is 10". I am looking to put in a Perry Pump but I have never done anything like this & could use all the help I can get.

Thanks,

Slim56

Slim,

A gentleman named Jon Lowe has developed a method that works great with the OS 1.60. If the engine is going to be soft mounted like in a 2 meter pattern plane I would follow all of his instructions. I did and the engine worked great. I have also have done just parts of his method and it worked great for that application too. If you just going to hard mount the engine to the firewall and run just standard or pitts style muffer then just install the pump per Jon's method and fly. You will need an OS pressure fitting #29407300 / Tower #LXWY11, and the Perry VP30 pump / Tower #LXDG59. Remove the rear engine cover from the engine and look at the upper left bolt hole in the engine case and there you will drill a 1/16 hole into the crank case. Make sure you use and oilly rag stuffed inside the engine to prevent metal shavings from getting up in you engine. The 1/16th bit will pass right by the threads in the crank case and not hurt them at all. This hole will provide the crank case pressure to operate the pump. One you have drilled the hole and made sure there are no metal shavings in the engine then reinsatll the engine back plate (cover). The pressure nipple now will replace the bolt that was there to hold the back plate in place. Use a little locktite around the upper threads of the pressure fitting and do not over tighten the fitting. It will get plenty tight to hold the back plate in and there is no stress there anyway. Mount the pump to the firewall and make sure you fill your tank from behind the pump. We ran and 18.1x10 APC prop, but we were running it on a tuned pipe. But for just sport flying the APC 18x6 worked great for me and the engine performed quit well. When you run the engine for the first time you will have to turn the highend needle in more than you would expect. Set the top end for the condition the engine is in, new slightly rich, broke in where you perfer. Once the top is adjusted start lowering the throttle down till the carb start to transition to the low end. It should just below or around half throttle. If the engine becomes rich and sputtering then start leaning the low end. The lower you go you may have to lean it some more. This will help you rough in the low end so you can fine tune get the engine to idel. Once you get the low end set correct will never have to adjust except for summer or winter flying. My OS 160 would idel a long time before even before it would show any signs of loading up and I talking minutes. One other thing is to slowly bring the engine up to full and pause in areas of the mid-range and make sure the engine is not too lean in those areas, make the engine run all the throttle area settings. You don't want to be too lean anywhere. I hoped I helped a little

Larry

How would I plumb a Perry pump on my GP Extra with a O.S. 160FX that already has a Dubro Quick fuel valve in it?

Toss the quick fuel valve and replace with fuel dots and plumb per the Perry Pump instructions.

Richard