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10-11-2019, 03:10 PM
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Join Date: Dec 2018
Location: NC
Posts: 136
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Good Quality Oil Pressure Sender?
In looking for a replacement for my failed VDO oil pressure sending unit on the IO360 I see that the VDO ones have quite some negative reviews on Aircraft Spruce...so do most of the other sending units...
Is there a consensus on a good quality brand that makes a single terminal unit?
Thx
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10-11-2019, 04:56 PM
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Join Date: Mar 2005
Location: SE Florida
Posts: 1,499
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Quote:
Originally Posted by Kooshball
In looking for a replacement for my failed VDO oil pressure sending unit on the IO360 I see that the VDO ones have quite some negative reviews on Aircraft Spruce...so do most of the other sending units...
Is there a consensus on a good quality brand that makes a single terminal unit?
Thx
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What are the complaints that the reviewers are posting on the ACs site? FYI VDO does not recommend using single post senders. The single post style relies on the body of the sender to make the ground connection. VDO also makes two post senders. You attach a ground wire to the second post to complete the ground independent of the body of the sending unit itself.
Charlie
Last edited by chaskuss : 10-12-2019 at 11:27 AM.
Reason: fixed spelling error
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10-11-2019, 05:27 PM
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Join Date: Dec 2010
Location: Floyds Knobs, IN
Posts: 633
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Is there a Kavlico option with A GRT EIS?
The VDO not only has grounding issues, they wear unpredictably at the normal cruise point as the wiper wears the resistor- yielding false high.
__________________
RV-6, bought from builder.
O-320, slider, carb, mags, FP
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10-12-2019, 04:57 AM
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Join Date: Apr 2010
Location: Clinton, Indiana
Posts: 997
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+1 for 3 wires
I just replaced my fuel pressure gauge and sender with UMA brand. It came with 3 wires to the sender plus a shield, and the gauge gets 12v from the buss. My original Vans sender and gauge varied for no apparent reason as commented by numerous other posts here. Just FWIW, I wonder if the Vans unit would be more stable with a dedicated ground run to the battery ground bus ?
__________________
Larry DeCamp
RV-3B flying w/7:1 0320 / carb / Pmags / Catto 3b / digital steam
RV-4 fastback w/ Superior roller 360/AFP/G3X/CPI/Catto3b
Clinton, IN
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10-12-2019, 11:25 AM
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Join Date: Mar 2005
Location: SE Florida
Posts: 1,499
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VDO also has better senders
Quote:
Originally Posted by moosepileit
Is there a Kavlico option with A GRT EIS?
The VDO not only has grounding issues, they wear unpredictably at the normal cruise point as the wiper wears the resistor- yielding false high.
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The only option on senders is the GRT P/N HS-SS-01 fuel pressure sender for fuel injected engines. Perhaps it's a Kavlico unit??? It sure is pricey, at $156. It also differs from the VDO senders in that it's stainless steel and has 4 wires, rather than 1. The VDO 1 wire senders can be purchases from GRT for $50. The VDO 1 and 2 wire senders are also available for less on Amazon and Jegs Performance [oil temp].
Do you have part numbers for Kavlico sender equivalents? The VDO pressure senders are 10 - 180 ohm units. I have a 20+ year old RMI uMonitor which uses VDO two terminal senders. The original oil pressure sender still works and is accurate. FYI, the uMonitor uses the same 10 - 180 ohm VDO senders, but with two terminals. The second terminal is used to ground the sender. Best methods would be to connect the sender grounds to the "forest of tabs" advocated in the AeroElectric Connection, or directly to the EIS. The two terminal senders are on average about $5 more than the single terminal [ground connection through the sender body] units supplied by GRT.
Below is a list of the VDO part numbers for the single terminal VDO senders supplied by GRT and VDO's two terminal equivalents. VDO recommends using 2 wire senders. The concern is that any sealant used on a 1 wire sender will impair the ground connection. The ground connection will also be affected by the multiple physical connections between the sender and the EIS.
Oil Pressure Transducer 10 bar 1wire VDO P/N 360-004 10 to 180 ohm
Oil Pressure Transducer 10 bar 2 wire VDO P/N 360-430 10 to 180 ohm
I don't know the VDO part number for the 1 wire fuel pressure sender. Below is the info for it's 2 wire equivalent. This is the low pressure sender used for carburetor engines.
Fuel Pressure Transducer 2 bar 2 wire VDO [Carb] P/N 360-043 10 to 180 ohm
OIl & Fuel Pressure Transducer 5 bar 1 wire VDO [FI] P/N 360-003 10 to 180 ohm
Oil & Fuel Pressure Transducer 5 bar 2 wire VDO [FI] P/N 360-410 10 to 180 ohm
All these senders have a 1/8" NPT fitting.
GRT uses both 5 bar [80 PSI] and 10 bar [150 PSI] oil pressure sending units, depending on the EIS's software version.
Download the GRT Troubleshooting guide for the EIS. Read pages 9 -11 regarding the oil pressure. Available at
http://grtavionics.com/media/Troubleshooting-Guide.pdf
Regarding your own problems with the VDO senders, where are/were your senders mounted? False high readings are due to open circuit or poor connections. Bad connection at the wiper would be one of several places that can happen on a 1 wire unit.
Charlie
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10-12-2019, 12:14 PM
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Join Date: Mar 2005
Location: SE Florida
Posts: 1,499
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Looks promising
Quote:
Originally Posted by moosepileit
Is there a Kavlico option with A GRT EIS?
The VDO not only has grounding issues, they wear unpredictably at the normal cruise point as the wiper wears the resistor- yielding false high.
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Rich,
I just spent a bit of time on the Kavlico web site. Their P4056 series senders look promising. I like the use of Flourosilicone seals and the Packard Metri-Pac 150 electrical connectors. For those of you who aren't gear-heads, the Packard Metri-Pac connectors are used on all GM & Toyota [and other manufacturers] critical engine sensors. I have over 30 years experience with these connectors. They really hold up well. They are also water resistant. It also means that replacement electrical connectors are available at quality auto parts stores. That's a good feature if future replacement is ever necessary.
This series are 0 -5 volt DC, as used by GRT. They are available in the same pressure ratings [2 bar, 5 bar and 10 bar] that GRT uses. The flourosilicone seals mean that you can even use them with E10 unleaded auto fuel. The data sheet says that 1/8" NPT fittings are an available option, like the VDO units GRT uses.
I would really like to hear about your knowledge and experience with the Kavlico brand.
Charlie
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10-12-2019, 12:29 PM
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Join Date: Jan 2005
Location: Medford, NJ USA
Posts: 283
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As of July, 2012, Dynon Avionics supplies the following Kavlico fluid pressure sensors for
monitoring oil pressure, fuel pressure, and coolant pressure:
Dynon Avionics P/N 101715-000 Kavlico Gravity Fed Fuel / Fluid Pressure Sensor ? 5 PSI
Dynon Avionics P/N 101690-000 Kavlico Carbureted Fuel / Fluid Pressure Sensor ? 15 PSI
Dynon Avionics P/N 101716-000 Kavlico Fuel Injected Fuel / Coolant/Fluid Pressure
Sensor ? 50 PSI
Dynon Avionics P/N 101693-000 Kavlico Oil Pressure Sensor ? 150 PSI
https://www.dynonavionics.com/includ...sors-Rev_C.pdf
From Dynon the Oil/Fluid Pressure Sender - Kavlico, 1/8-27 NPT, 150 psi is $85
Don't know if this helps at all.
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10-12-2019, 01:31 PM
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Join Date: Mar 2005
Location: SE Florida
Posts: 1,499
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Quote:
Originally Posted by RV10Pilot
As of July, 2012, Dynon Avionics supplies the following Kavlico fluid pressure sensors for
monitoring oil pressure, fuel pressure, and coolant pressure:
snipped
Dynon Avionics P/N 101690-000 Kavlico Carbureted Fuel / Fluid Pressure Sensor – 15 PSI
Dynon Avionics P/N 101716-000 Kavlico Fuel Injected Fuel / Coolant/Fluid Pressure
Sensor – 50 PSI
Dynon Avionics P/N 101693-000 Kavlico Oil Pressure Sensor – 150 PSI
snipped
From Dynon the Oil/Fluid Pressure Sender - Kavlico, 1/8-27 NPT, 150 psi is $85
Don't know if this helps at all.
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Thanks, that helps, as it shows that Dynon made Kavlico senders work. The 0-5 PSI is irrelevant to RV builders. The 0-15 PSI, would, I think, be more accurate for those with engines with carburetors. That said, GRT has you enter codes so that the EIS knows what pressure or temperature range sender is being attached. Their standard senders are 2 bar [0-30 PSI], 5 bar [0-80 PSI] and 10 bar [0-150 PSI] I strongly suspect that there are other codes which would allow the use of the 0-15 PSI and )-50 PSI senders. You would have to call GRT tech support to verify that.
Those are Dynon part numbers, which is helpful to order the senders from Dynon. Could you check one of your Kavlico senders for a part number? The Kavlico P/N would look like P405x-A-E-4-[A or C].
Upon closer examination of the P4056 data sheet, I learn that the Kavlico sending units are 3 wire [5 volts in, modified voltage out, and ground] units, so can not be used as drop in replacements.  That said, the HS-SS-01 GRT sender is also a 3 wire [albeit 12 volt] sensor. I'd have to call GRT tech support on Monday to find out if they have the capability to use these senders on the auxiliary sensor input circuits.
Charlie
Last edited by chaskuss : 10-13-2019 at 10:44 AM.
Reason: fixed syntax errors in 1st & last sentences
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10-12-2019, 03:30 PM
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Join Date: Dec 2010
Location: Floyds Knobs, IN
Posts: 633
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Thanks, Charlie! That gives me something to work with for an upgrade.
Failure mode always the same. Cruise OP becomes 99psi. Per the GRT guide that's a bad sender. Actual cruise OP is 77psi. Grounding is extra case ground to the main forest of tabs. It shows accurate pressure at startup still. It is on a manifold on the firewall vertically threads down sender terminals on top, the vent on top is clear and free of blockage. 10 bar 360-004. Easy replacement, just a pain having a recurring short 2 year lifespan twice now.
Always checked with a mechanical guage tied in for a ground run, temporarily replacing the sender to make sure it isn't the engine.
__________________
RV-6, bought from builder.
O-320, slider, carb, mags, FP
Last edited by moosepileit : 10-13-2019 at 09:31 AM.
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10-13-2019, 07:47 AM
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Join Date: Dec 2018
Location: NC
Posts: 136
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Lots of good info; thank you.
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