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08-29-2012, 07:17 PM
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Join Date: Dec 2006
Location: Greensboro,NC
Posts: 152
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Lightspeed sensor wires
Has anyone tried to cut and reconnect the crank sensor wiring on a Lightspeed unit. I know the factory does not approve, but how have you "successfully"  accomplished this.
Thanks,David
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08-29-2012, 07:41 PM
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Join Date: Jan 2005
Location: West Chester, Pa
Posts: 583
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I cut a notch down from the top of the flange on the firewall about three inches. This allowed me to slide the wire down the slit. At the bottom of the slit I drilled a hole that intersected the slot. This is where the grommet goes.
I slit a grommet and slipped it on to the wire and pushed it into the hole. The slot was then filled with firestop. I may have some photos.
__________________
Jeff Vaughan
RV 12 N237VW ELSA
RV 7A N561EV Sold
West Chester Pa
2020 donation current
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08-29-2012, 07:57 PM
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Join Date: May 2010
Location: Ft Laudedale FL
Posts: 180
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Yes
I had a dual crank sensor and was only using one ignition initially. When I went to connect a 2nd unit a few years later I found that 2 of the wires were worn thru by rubbing the flywheel. I used normal crimp style butt connectors to fix. Worked perfect. Of course I did a better job of securing the wires this time. That was about 8 months and 120 flight hours ago. I also have the new feature that has 2 led lights to warn if either unit goes off. Don't know when that came out, but believe it may have come out after 2007.
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Dale
ATP, dreamer and maintainer; but not a builder
RV6a N18XP 960TT (builder: Jerry Cochran)
RV6a flight experience 2100 hrs
Superior IO-360 2007
Hartzell Blended Airfoil Prop
Dual LS EI, Dual Battery
GRT HX efis & RAIM GPS, 2 axis GRT autopilot
G696, GDL39 WX, Traffic
Dynon D10
Gear Leg Stiffeners from Woodmanrog
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08-29-2012, 09:31 PM
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Join Date: Dec 2005
Location: Mahomet, Illinois
Posts: 2,195
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If I recall correctly ...
... Chad unsoldered the wires on the factory D-sub for his Lightspeed, ran the wires thru a small hole in the firewall, and then resoldered the D-sub. It worked fine. Personally, I did not have that much confidence in my soldering skills ... I just cut a near-one-inch opening in the f'wall, and then used a SS shield.
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Terry Ruprecht
RV-9A Tip-up; IO-320 D2A
S. James cowl/plenum
(Dues paid thru Nov '18)
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08-30-2012, 04:21 AM
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Join Date: Jan 2005
Location: Martinsville, IN
Posts: 2,326
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Yes, I used crimped d-sub pins. Takes all the angst out of trying to solder those little suckers. I thought is was more important to have small holes in the firewall.
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Randy Pflanzer
Greenwood, IN
www.pflanzer-aviation.com
Paid through 2043!
Lund fishing Boat, 2017, GONE FISHING
RV-12 - Completed 2014, Sold
427 Shelby Cobra - Completed 2012, Sold
F1 EVO - partially completed, Sold
F1 Rocket - Completed 2005, Sold
RV-7A - Partially completed, Sold
RV-6 - Completed 2000, Sold
Long-EZ - Completed 1987, Sold
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08-30-2012, 06:26 AM
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Join Date: Oct 2005
Posts: 1,516
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Exactly what Randy did.
Mark the wires before you cut them, they are all white.
Besides, if you are ever going to add a second Lightspeed or like me, connect the outgoing RPM wire on the wrong Dsub, it'll be much easier to push a crimped pin into the correct slot vs soldering under the instrument panel.
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Ernst Freitag
RV-8 finished (sold)
RV-10 Flyer 600 plus hours
Running on E10 mogas
Don't believe everything you know.
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08-30-2012, 09:39 AM
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Join Date: Dec 2007
Location: Flagstaff, AZ
Posts: 2,653
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I am going to be using firewall CPCs for all my sensor wires, including the LSE sensors, on my RV-10. The LSE wires will be cut and pinned at the CPC. It's a high-quality connection, so I am not particularly worried - from a design point of view - about problems with the system, but I will be testing carefully to make sure that the installed system operates normally.
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Patrick Kelley - Flagstaff, AZ
RV-6A N156PK - Flying too much to paint
RV-10 14MX(reserved) - Fuselage on gear
http://www.mykitlog.com/flion/
EAA Technical Counselor #5357
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08-30-2012, 10:08 AM
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Join Date: Apr 2006
Location: Vancouver island, BC Canada
Posts: 385
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Patrick, what's a CPC?
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Jim Green
RV7 tip up
IO360 Whirlwind 200RV
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08-31-2012, 09:06 AM
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Join Date: Dec 2007
Location: Flagstaff, AZ
Posts: 2,653
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CPC = Cannon Plug Connector. The ones that Aerotronics has located for my firewall are designed to withstand high temps, as opposed to the plastic-bodied ones in use elsewhere in my airframe. They cost a lot more, though.
__________________
Patrick Kelley - Flagstaff, AZ
RV-6A N156PK - Flying too much to paint
RV-10 14MX(reserved) - Fuselage on gear
http://www.mykitlog.com/flion/
EAA Technical Counselor #5357
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