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01-02-2014, 02:18 PM
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Join Date: Jan 2007
Location: Picton, Ont., Ft. Myers, Fl
Posts: 294
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update
Got a chance to look behind the panel today.
My mag selector switch is very simple with a shielded lead running from each of the 2 terminals to each mag.
There is a shower of sparks vibrator on the firewall with power supplied from the toggle start switch via the starter solenoid. Repeated attempts to make it vibrate were unsuccessful. Power verified to the unit but no noise or vibration.
The left mag has 2 P leads and the right has one.
I'm thinking the vibrator is toast.... for the moment undecided as to replace ($450 new) or go Pmag which of course is more.......
__________________
Dave Main
Membership due Oct., 2020
RV-4 0-360-188 Catto 3-blade C-FTDQ...
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01-02-2014, 02:31 PM
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Join Date: Jan 2005
Location: Peoria, AZ
Posts: 1,053
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another option
Hi Dave,
I had the same setup on my RV with the same problem. I replaced the one bendix mag with an impulse coupled mag and eliminated the shower of sparks.
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Regards,
Thomas Velvick
Goodyear, AZ (KGYR)
2020 Donation sent.
N53KT RV-6a finished 2018, Flying
N7053L RV-4 Wife's RV
N56KT RV-4 Finishing
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01-02-2014, 05:13 PM
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Join Date: Jan 2007
Location: Picton, Ont., Ft. Myers, Fl
Posts: 294
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impulse
Quote:
Originally Posted by rvator51
Hi Dave,
I had the same setup on my RV with the same problem. I replaced the one bendix mag with an impulse coupled mag and eliminated the shower of sparks.
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That's another possibility for sure Tom. The SOS mag (left) that I am running is S4LS-200 BL600614-1 Any idea of the impulse coupled model I would replace it with? Looking at a rebuilt Bendix.
__________________
Dave Main
Membership due Oct., 2020
RV-4 0-360-188 Catto 3-blade C-FTDQ...
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01-02-2014, 05:40 PM
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Join Date: Feb 2006
Location: Valley Forge, Pa
Posts: 636
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The shaft length may be different,you will need to change the studs to long on the left side,acquire the impulse gear and housing. Makes more sense to go one p mag on the left side,you will use the same gear and studs,eliminate the shower of sparks stuff and have the benefits of EI for the same cost as repairing/rebuilding what you have.In time you can acquire a second P Mag.
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01-17-2014, 06:01 PM
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Join Date: Jan 2007
Location: Picton, Ont., Ft. Myers, Fl
Posts: 294
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further SOS troubleshooting
So I've had a chance now to do a bit of further investigation and testing of my Shower of sparks system.
Spoke to a magneto repair shop and was advised to check the vibrator by grounding the "BO" terminal on the vibrator and activating the start switch. Did so and the vibrator activated! So it seems to work fine.
Then checked the shielded lead that leads from the BO terminal on the vibrator to the retard terminal on the left mag... good continuity. The magneto was removed and serviced and all normal, points included.
Now advised to remove #1 plug lead, select Left mag and pull prop through TDC to see if there is a strong spark but if the vibrator won't activate, how can the SOS system provide spark at TDC like it is supposed to during starting?
I have decided to try to sort this system out without changing major components...
Thanks
__________________
Dave Main
Membership due Oct., 2020
RV-4 0-360-188 Catto 3-blade C-FTDQ...
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01-17-2014, 06:38 PM
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Join Date: Nov 2010
Location: Australia
Posts: 53
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We had a similar problem on our Yak (with a similar switch/mag setup to you). Turned out to be a bad HT lead from the starting coil to the left magneto. From memory, the lead tested ok with a meter, so was not found initially. When replaced spark was fine. Not saying this is your problem, but sometimes the cheap things (HT leads) are easier to swap than expensive (mag, coil etc).
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01-18-2014, 08:41 AM
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Join Date: Jan 2007
Location: Picton, Ont., Ft. Myers, Fl
Posts: 294
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Can you clarify what you mean by "coil". My system only has the SOS vibrator leading to the Magneto....
__________________
Dave Main
Membership due Oct., 2020
RV-4 0-360-188 Catto 3-blade C-FTDQ...
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