| Hi Guys
I realised I made a mistake with reading the timing. I was adding the 5 deg ATDC, instead of adding -5 deg.
Today I sought to check the maximum advance of the timing. Nearly blew Dad of the front of the Glasair! With the prop pitch full fine the manifold pressure was only 14.5’ At 5000 rpm it appeared the advance had maxed out at approx 23 deg BTDC. At 1750rpm idle timing was approx 8 deg BTDC
I will now try and fine tune the timing in flight and see if can take any further advance. Can anyone comment on their maximum advance of their timing?
Thanks
Steve Izett
Thanks Dave.I’m guessing a feature like that adjusts the flash and enables you to dial in what you want and then your just looking for the reference marks to line up.I would imagine that makes it easier instead of having to mark out whatever your reading from.I’d still like to have a definitive process to move forward with from Tracy as the designer.CheersSteveOn 26 Feb 2022, at 8:00 am, Pam & Dave Williams padajute@idcnet.com <flyrotary@lancaironline.net> wrote:
Hello Steve,
I used the stock timing marks with a timing light. My timing light has an advance\retard feature. Yes very windy!!!
Thanks,
Dave Williams
-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
Sent: Thursday, February 24, 2022 4:43 PM
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: [FlyRotary] Re: Timing
Thanks guys.
Dave, did your measure the timing with a timing light and with the prop on?
Must have been pretty windy getting that data!
I’ll mark up the ring gear with a TDC mark this morning and measure the current EC2 base Mode timing
Which method do people prefer to get TDC? I think I have read about these 3 methods.
1. Rotor #1 equal Screwdriver depth to rotor face through both plug holes 2. Rotor #1 volume null using water in a tube - I think this might be from Lynn H 3. Rotor #2 bisecting Apex seal across T & L spark plug hole
Can anyone else tell us their nominal timing at idle. Ours is ~1800rpm.
And particularly anyone running a 4 port renesis like Tracy’s RV4.
Cheers
Steve
On 25 Feb 2022, at 6:07 am, Pam & Dave Williams padajute@idcnet.com <flyrotary@lancaironline.net> wrote:
Hello Steve,
My timing is locked in at 35 degrees before top dead center from idle to 6500 RPM. You are on the right track because retarded timing will raise exhaust temperature. I have a 13b with Tracy's EC2\EM2 and the RD-1AB redrive.
Thanks
Dave Williams
-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
Sent: Wednesday, February 23, 2022 6:45 PM
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: [FlyRotary] Timing
Hi friends
On my last flight I experienced high indicated EGT’s so as part of looking into this I would like to check my timing.
I have a Renesis engine and Tracy’s EC2.
In his A8 (Renesis) version of the handbook under Mode#8 Timing Adjustment it says to refer to ‘Initial Timing Adjustment’, however I can’t find any such instructions in this version, probably because it has a fixed position CAS.
Can anyone enlighten me on what the static timing should at a given idle rpm?
Much appreciated.
Steve Izett
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