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Steve,
Tracy's manual uses 35 BTDC at the place where the hall sensor matches up with the trigger in the CAS. This does not mean that the spark will fire at this point, and indeed it should not. Its just where the EC2 should get an approximate initial signal, leaving it time to calculate and actually send the signal to fire. If your timing light is showing 35 BTDC, then you are too far advanced. Actual advance should be closer to 20-25 deg (variable) when using the timing light.
Dave Leonard
Hello, 35 degrees BTDC all the time verified via timing light. Info from Tracy’s manual and tested by me for most power in flight. 100 LL gas with 2 cycle oil @ 1 oz. per gallon. 6,300 RPM stock 13b. Thanks, Dave Williams From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
Sent: Tuesday, October 20, 2020 9:38 AM
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: [FlyRotary] Re: Tuning Steve = Using Megasquirt for ECU. How is your flight testing going?
Jeff = I meant prop rpm. Using Neil's PSRU, which is 3.17. I just bumped up my idle to around 800prop (2500engine). I forgot to add, I am P-Port which causes a need for higher idle.
Lynn = Idle can be that high? Usually I see rotary idle around the 10-18 range, but that is for a car. Little different with a prop on 100% of the time. Neil = That is a nice idle. I forget, are you P-Port? What is your timing at?
Dave = 35 all time? Doesn't that seem really high for rotary. Pump gas? Lynn was saying 24 degrees for 87 octane.
Hi there Matt and all
What computer is controlling your fuel and spark Matt?
Ive left the timing of the EC2 on the Renesis 4 port at Tracy’s default and haven’t changed it but was wanting to do some experimenting.
I take it that the timing setting in the EC2/3 will vary the whole timing curve over the rpm/load envelope.
Cheers
Steve Izett
Renesis 4 port EC2 EM3 RD1-C
> On 19 Oct 2020, at 10:21 am, Matt Boiteau mattboiteau@gmail.com <flyrotary@lancaironline.net> wrote:
>
> Split table.
>
> - Matt Boiteau
>
>
> On Sun, Oct 18, 2020 at 10:17 PM Matt Boiteau mattboiteau@gmail.com <flyrotary@lancaironline.net> wrote:
>
> What AFR and timing are people running for idle, taxi, takeoff, climb, cruise, descent?
>
> idle = 11afr, 20 timing
> I seem to have to be around 11afr for it to stay alive. Still trying to get it to idle around 600rpm, maybe bump it up to 700rpm to be smoother without dieing and shaking apart.
>
> taxi / takeoff / climb = 13.2afr, 28 timing
>
> cruise - not sure aft, 28 timing
>
> decent - not sure aft, 32 timing
> Not sure what the plane likes. I tried 14afr, but the MAP really get's low and engine shakes. Guessing it should be more rich?
>
> I attached the timing table and split rotary table (second email). Not sure how to tune timing, I just want safe values for now.
>
>
> - Matt Boiteau
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