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Old 08-20-2010 | 11:23 PM
  #60  
pattratt
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From: College Station TX
Default RE: YS 170 DZ CDI

Hi All

I receive my original engine back from Richard with a new pump, front seal, and correct rear plate gasket.

I made 8 flights this afternoon and the engine ran perfectly. All the fuel settings were back where they should be. I am doing some testing for Richard on the pump and dropped back to the 19x11 prop and I agreed to use a fan between flights. I flew with as little as 10 minutes between flights and had absolutely no starting issues. I don"t think today was a good test as relates to heat as we had rain early and the temps were in the mid to high 80's. THE REAL TEST WILL BE AFTER 40 TO 50 FLIGHTS IN 100 DEGREE HEAT!!

I have also learned that YS is making some design changes to the pump diaphram and to what I call the pump body plunger. I am not sure if these changes are going to allow what I call "normal operation" or not, meaning being able to run in the heat back to back flights without having a cooling fan between flights? I would preferr to run the 19.5x11.5 prop, but for now Richard wants me to keep engine rpm's above 7300. I do not have the ground clearence on the Valiant to run a 20x10. I am still using the 30% LS fuel for this test. Hopefully this winter I will have over a 100 flights and can try to run the 19.5x11.5 and lean the engine out to make the 7300 rpm. I may be dreaming here. LOL

I will post more results as they become available.

Thanks to all who have provided input to this thread.

Dick