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Hi Mike, FWIW I have the same cut-down (Mazda) throttle body as you do and a similar looking intake - mine differs in that it sits ontop of the dynamic chamber and there is a RAM air scoop for cold
air. When I first started running my engine, the top end static rpm was also limited, IIRC it was 5700 rpm; I did not repitch my ground-adjustable prop. I suspected that my ignition timing was not quite right, so I follwed the manaul setup supplied by Lynn
and found the timing to be way off - after resetting it to 35 BTDC as per the EC2 instructions the top end rpm was now 6130 rpm, with RD1C.
Jeff
From: Rotary motors in aircraft [flyrotary@lancaironline.net] On Behalf Of Mike Wills [rv-4mike@cox.net]
Sent: Thursday, October 15, 2009 11:21 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: where's the missing power?
Sorry for my absence on a topic I started. My nephew had a skateboarding accident last weekend and is in the hospital in a chemically induced coma until his brain swelling is under control. And I thought car powered airplanes
were dangerous. Stay away from skateboards.
Tracy - My mixture monitor shows stoich at full throttle. I suspect an airflow issue rather than fuel.
Al - my vacuum gauge is located in the plenum directly behind the throttle plates.
Lynn - I agree that the TB inlet is horrible and needs a bell mouth. The inlet is also pretty obstructed by the cowl which isnt visible in the pics I sent. I think I'll make an attempt to clean this up some and see if it gets
me anywhere. If not I'll live with it for a while.
Kelly - always tough to determine if the problem is an engine issue or if the load is simply too much for the engine to overcome. I'm going to experiment with the shallow dive several have suggested and see what happens.
Mike
----- Original Message -----
Sent: Tuesday, October 13, 2009 4:21 PM
Subject: [FlyRotary] Re: where's the missing power?
From: Rotary
motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of
Al Gietzen
Sent: Tuesday, October 13, 2009 7:22 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: where's the missing power?
I dont have a regular manifold pressure gauge, just an industrial type vacuum gauge ( I really gotta get an MP gauge). Anyway, the
vacuum gauge was indicating 4" of vacuum.
Where are you measuring the 4” vacuum? If it is near the ports it is no unusual; if it is out before the runners; something is
wrong.
Al
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