Wednesday, July 13, 2022

7/13/2022 update

 We took a family break and am back to toasty hot Texas.  Typically it's over 90 in the hangar and 100+ outside.  Good post curing weather.

The new NACA  diffuser was glassed in last night.   The new Cablecraft throttle cable is installed and is buttery smooth.

For now, I decided to forego cuffs for the #3 and 4 cylinders and put Titanium heat wrap on the exhaust pipes, test and then decide what to do next.  Commentary on the Internet about exhaust pipe wraps varies.  Some people have had no issues for years and others have had problems, usually attributed to having mild steel pipes rather than stainless, over wrapping the pipes, getting the wraps wet and not getting enough heat into the engine to dry the moisture out of the wraps.  Galvanic corrosion seems to be an issue with some types of wraps as well. 

The directions for the DEI Titanium wrap advise to put the wrap's stitched edge exposed and overlap only 1/4".  The #3 exhaust pipe has to be contributing quite a bit of heat to the air flowing through the engine.  #4 is shielded a little with the cabin heat muff so will be interesting to see the results.

I've also peered over the Dynon EFIS data quite a bit and realized that I should be using the heading, VSI and altitude bugs to make it easier to correlate the data with the test being performed.  A remaining task for the HDX system is to calibrate the magnetic compass.

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