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Date: Sun, 03 Jun 2007 22:03:28 -0500
From: Charlie England <ceengland@bellsouth.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Houston, we have a problem...
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David Staten wrote:
> Chris got it running again today.. and he is 'getting the feel' for the 
> engine, and starting it.
> 
> This is still no-load, no instrumentation engine operation.. 
> Instrumentation is probably the next focus: EGT on the exhaust.. 
> calibrate oil temp and pressure probes, as well as obtaining fuel 
> pressure senders.
> 
> May take the radiator drain fitting out and use that as a temp sensing 
> point, or have the radiator tapped at its discharge point for that 
> purposes.
> 
> 
> Ok....
> What we know:
> 
> One of the secondaries had a poor connection and broken wire inside a 
> crimp. This caused an intermittent power condition within one of the 
> secondary fuel injectors.
> 
> This is the only repair made, and starting was possible after this. This 
> is a very concerning failure mode. I will await Tracy's return to see 
> what he thinks..
> 
> B runs smoother than A. The only diff is an intake air temp probe on A 
> and non-temp adjusted values on B.
> 
> The EC2, as programmed to defaults, is somewhat rich in the no-load 
> condition of our street ported (by us) engine. We are getting very good 
> results with manual leaning and estimated revs in the 3-4000 range with 
> a closed throttle, simply by using mixture to control the engine.
> 
> None of our runs have been substantial enough to cause the thermostat to 
> open on the coolant circuit. Engine makes hot oil and hot water, and 
> sends the hot oil through the oil cooling system.
> 
> Our RD1-B has oil circulation, and is warm to the touch from the hot oil 
> being circulated in it. There is minimal to no discernable drainage from 
> the aft oil drain hole on the RD1-B. We have good oil in, and good oil 
> out from the lower/forward drain hole, but none from the upper/aft one. 
> I have aluminum tubing and tube nuts on this run. I will make a short 
> "soft line" for this run, as well as for the oil feed (which is 
> currently a stainless "hard line" run from the stock oil pressure sensor 
> port to the redrive inlet port.
> 
> Anyone have any thoughts on the injector power being a possible point of 
> failure? Has anyone else had a single secondary injector (presumably 
> staged) unpowered before and had a problem?
> 
> Dave
> 
Simple test: break it again & try to start it. If that really was the 
problem (seems unlikely) then you won't be able to start it next time, 
either.

Basic 'scientific method' stuff.

Charlie