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Home » Topics » Main Forum » PIPER MODELS » PA-34 » Seneca 2 with Merlyn Black Magic wast gate overboots

Seneca 2 with Merlyn Black Magic wast gate overboots

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Posted In: PA-34

  • Participant
    Stephen Murphy on April 8, 2018 at 6:19 am #18618

    Thanks for the response. Being new to the plane I’ll take any information I can get my hands on!

    Participant
    STEVE on April 5, 2018 at 10:38 am #18616

    Hi,
    Mouse Milk is applied to the shaft ends of the turbocharger wastegate butterfly. Just squirt a little on each end of the shaft where it projects out of the housing.
    I’m going to try to get Piper Flyer member David McKenna to weigh in on your questions. He flies a Seneca with the Black Magic turbo controllers.

    Participant
    Stephen Murphy on April 4, 2018 at 10:55 am #18608

    Hello all. Just picked up my 1980 Seneca 2 with Merlyn wast gates. New to turbos so I have some questions about the Merlyns behavior. I just want to make sure they are behaving the way they were designed. I should mention that I have the Pressure Limiter (POP off valve for overboots protection).

    My questions are these.
    1) Seems these throttles are VERY sensitive and I’ve never had them anywhere near full open. IS this normal operation or do they turbos need to be adjusted a bit. I have pretty good control of the boost all the way cup to 16K (that’s as high as I’ve gone).
    2) What are sings that the Merlyn wast gates are “sticking”? I pulled the RPM back to 2300 and WHAM! one of the engine overboots and the engine were set at 32. One of them “Jumped”. Is this a sign of a sticky wast gate? What can I do to ensure they work smoothly? I have heard mouse milk is good but I have no idea where to put it if that is the case.
    3) Aslo, any help on climb and cruise setting for your engines. I wold love to hear how people fly their planes, but only then ones that didn’t need a top overhaul at 400 hours! LOL. Power cruise setting I’m curious about. I’m thinking the 65% rout to save the engines but I’ve heard that 75% run right is fine. Any thoughts?

    4) What kind of numbers are you getting at cruise, (KTS, TIT, CHT’s, EGT)

    I have to say, I love this plane but taking some time to get to know her so to speak. Treat her carefully or else she’ll end up like a bad girlfriend, high maintenance.

    Attachments:
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