It advances based on MAP (and RPM). According to the advance map diagram once provided by Surely, there is no advance at all above 25". At WOT that happens around 5,000 ft. Of course throttling back the and reducing the MAP below 25" should produce advancing. FWIW I was flying at 6,500 ft. today. At 2400 RPM WOT MAP WAS 23.5", so presumably a modest advance. Conversely, cruising at 2400 RPM, the SF will not go to the maximum possible advance regardless of MAP. Basically my max advance (2400 RPM) happens WOT at around 8,000 ft.
IRAN Right Magneto or Install SureFly?
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- Rich
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Re: IRAN Right Magneto or Install SureFly?
2002 DA40-180: MT, PowerFlow, 530W/430W, KAP140, ext. baggage, 1090 ES out, 2646 MTOW, 40gal., Surefly, Flightstream 210, Orion 600 LED, XeVision, Aspen E5
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Re: IRAN Right Magneto or Install SureFly?
According to the ignition map I pulled off the SF site way back, below 400 RPM the SF retards to 0 deg BTDC for starting. from 400-~1550 RPM it will be at the "normal" advance (for us, 25 Deg BTDC). The actual starts as one moves above 1550 RPM and MAP below 25".
It's possible that the actual mapping has been tweaked a bit from this illustration - which SF no longer seems to publish. But the basic design philosophy is likely the same. I do note that when shlepping around locally (6-7K ft.) my EGT/CHT behavior is as I remember it pre-SF. It's at higher altitudes where the peak EGTs fall off and CHTs get higher. Also, this rev 2 I have seems to behave differently in this respect than the earlier, non-28V-friendly one. Another difference that's more obvious is that it resets much more quickly. This is obvious during runup, as the switch between the mag and the SIM produces no detectable stumble.2002 DA40-180: MT, PowerFlow, 530W/430W, KAP140, ext. baggage, 1090 ES out, 2646 MTOW, 40gal., Surefly, Flightstream 210, Orion 600 LED, XeVision, Aspen E5
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Re: IRAN Right Magneto or Install SureFly?
Thanks for the info on advance Rich! Very thorough.
Also thanks to all for the comments on replacing the left vs right magneto.
Where did you guys source the power from, battery terminal or solenoid ? Surefly says "Uninterrupted power may be sourced directly from the aircraft battery positive (+) terminal or from the battery (+) input terminal of the aircraft master solenoid."
I'm curious because of the challenge to remove the "relay box cover" guarding the solenoid...
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Bruce
Also thanks to all for the comments on replacing the left vs right magneto.
Where did you guys source the power from, battery terminal or solenoid ? Surefly says "Uninterrupted power may be sourced directly from the aircraft battery positive (+) terminal or from the battery (+) input terminal of the aircraft master solenoid."
I'm curious because of the challenge to remove the "relay box cover" guarding the solenoid...
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Bruce
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Re: IRAN Right Magneto or Install SureFly?
On my installation the fused + wire goes directly to the + terminal on the battery and the ground wire just goes to a convenient ground location.
2010 DA40 XLS, N123MZ, KHIO
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Re: IRAN Right Magneto or Install SureFly?
Same here for the power. The battery terminal is easier to get to. There isn’t actually a ground wire. The SF grounds through its frame to the engine.
2002 DA40-180: MT, PowerFlow, 530W/430W, KAP140, ext. baggage, 1090 ES out, 2646 MTOW, 40gal., Surefly, Flightstream 210, Orion 600 LED, XeVision, Aspen E5
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Re: IRAN Right Magneto or Install SureFly?
The unit has increased quite a bit in price since I installed mine. Installation for the left mag was something like 2 hours.
1. Remove mag (left more easily accessible than right)
2. Remove mag drive gear from mag and install onto the SIM.
3. Set SIM dip switches
4. Install and time Sim (at 0 deg BTDC).
5. Connect power lead to battery
6. Install MAP tap to MAP hose (one needs to source the appropriate "T" fitting).
7. Disconnect (and optionally remove) the SlickStart.
For the right mag: Add in the removal of the ignition switch grounding jumper and moving the RPM pickup to the left mag. Another Hour? Other than the jumper, everything is in the engine compartment and in any case you don't add anything going through the firewall. Another hour?
NOTE: We left the SS leads capped off and tied back in place should we want to revert. The SS power lead still goes hot during start but has no effect.
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Re: IRAN Right Magneto or Install SureFly?
Two years ago I replaced the right mag in my 2002 DA40 with a SureFly. No timing adjustment based on MP (not permitted by SureFly for my plane because it has the Forced Aeromotive supercharger). Very pleased with the SureFly; makes engine starts much easier. Had the removed right mag checked out and all set as a quick drop-in replacement for the left mag.
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Re: IRAN Right Magneto or Install SureFly?
The right and left mags are different models.BuzzB wrote: ↑Thu May 18, 2023 8:32 pm Two years ago I replaced the right mag in my 2002 DA40 with a SureFly. No timing adjustment based on MP (not permitted by SureFly for my plane because it has the Forced Aeromotive supercharger). Very pleased with the SureFly; makes engine starts much easier. Had the removed right mag checked out and all set as a quick drop-in replacement for the left mag.
EDIT: to clarify, the differences are obviously to accommodate the SlickStart. You could probably mount the right mag in the left position but would lose SS function.
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Re: IRAN Right Magneto or Install SureFly?
Random question: I usually do the garmin DB updates while the engine is warming up to save a bit of time and battery, which requires cycling the battery/alternator to get the G1000 to reboot. I'm assuming this would have the effect of doing a "mag check", forcing the engine to run on the classic magneto?