RE: Zenith-List: 912 hard start when hot

[<george.pinneo@xxxxxxx>]

--> Zenith-List message posted by: <george.pinneo@xxxxxxx>

Were you to examine a Kitana with the certified Rotax 912, much understanding of how this engine was certified would be obvious.  

The version originally certified in this country used a metal intake chamber across the engine from Bing to Bing, fed by a separate air scoop on the left side.  The Bing overflow tubes are connected into this intake chamber, above the pans. A separate air filter is placed in the air scoop to filter debris from intake air.  

The fuel lines were metal-to-metal until breakage at the Pierburg fuel-pump forced in-field mods to allow some flex.

The Kitana has only a SINGLE, right-side, 4" diam. air intake for the cylinders (!) 

The certified engine comes with a ceramic/epoxy air "shield" that forces air down through the cast fins on each cylinder.  For us homebuilt exp. people this cerarmic shield is kinda pricey @ $1,000.  I built my version of it of .016" alum. for pennies; it works just fine after 470. hours. I feed air into my alum. down-draft shield from dual intakes on each side of the spinner. You can find some descriptions of this in the archives, or call me @ (310)545-5951, for a more complete description/discussion.

I've only seen fuel overflowing the Bings once when I had my Bing overflow drains connected to a tee in an attempt make a neater drain.  DON'T DO THIS!  It will cause wild and random engine rev and idle cycles.  I did make it back to the runway, but I did NOT enjoy learning about this!  I've made small alum. tubing drains to carry fuel out of the engine compartment, but they are separate drains.

GGP


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