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Jeff.
I have had a similar experience with my LIV-P with the Conti TSIO-550. I had to step climb due to high cylinder head temperatures in the #2 cylinder. It was always 30-40 degrees F hotter than the next hottest cylinder. (#1). My personal limit was a cylinder head temperature of 420 degrees. I tried a couple of things, like to clean and/or change the position of the injectors. Since they were matched flow injectors, I put them back where they belonged and my peak EGT's returned to peaking within 0.2 - 0.3 gal/hr fuel flow.
My resolution was to do 2 things:
1. Properly set up the engine for fuel flow according to Continental Service Information Directive SID97-3E. It is available on the Continental website. Also note that it refers to Maintenance Manual M-18 for the TSIO-550. I have attached the appropriate table from M-18. The engine had been "set up" at least 3 times before I did it myself by people / institutions that should know how to do it. They obviously didn't. The setup requires a "Port-O-Test" calibrated test box. It will take a couple of days, maybe more, to do it right the first time. (At least it did me.) You'll also need some fittings to get the Port-O-Test hooked up. It will also give you an indication whether your on-board instruments are accurate. Mine were OK, just not right on.
2. I put the baffle mod on. Review the document on the LML website by Fred Moreno: "Drag Reduction Part 2A.pdf." You can find it under the link on the LML homepage to "Tips & Tricks." I have attached a photo of my modification. (More photos and high res available...just ask.) You also need to be sure that a "tongue" of baffling extends below the oil box to keep air flow along the fins on the lower back side of the #2 cylinder. (It is usually already there on the Lancair baffling kit.)
The result was that my #2 cylinder is no longer the hottest cylinder. It's either 2nd or 3rd hottest. All the cylinders run much closer temps at all times. My hottest cylinder in climb, even on a hot day, runs about 385 degrees.
I'm now a happy camper and much more confident about how my engine is performing.
Of course, your experience my not be like mine, but the baffle fix really helped the #2 cylinder on my engine.
Barry Knotts
LIV-P, Conti TSIO-550
Perrysburg, Ohio
On 7/18/2010 9:52 AM, Jeffrey Liegner, MD wrote:
I continue to have Cyl 2 CHT temp problems, limiting my climb parameters. Especially with summer ....
Jeff L
LIVP
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