REFLECTOR: starter trouble

Lou Stedman stedmanlou at roadrunner.com
Wed Oct 8 20:08:04 CDT 2008


Thanks Dave

Lou Stedman
Velocity N7044Q
Olean, NY
----- Original Message ----- 
From: "Dave Philipsen" <velocity at davebiz.com>
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
Sent: Wednesday, October 08, 2008 5:28 PM
Subject: Re: REFLECTOR: starter trouble


> Lou,
>
> Instead of using your meter to read voltage as referenced to ground,
> start checking voltage drops on the various components.  From the
> numbers you quoted, there probably is not an appreciable drop across
> either of the solenoids.  But, you could check it by simply placing your
> meter across the solenoid while trying to start the engine.  If you
> fashion some sort of extension wire for your meter, you can read the
> voltage drop across any of the wires including the one that connects the
> output of your starter solenoid to the starter and the one that connects
> your battery ground to the engine. As was brought out before, there are
> very few cases where the voltage drop should exceed a volt.
>
> You definitely have an excessive voltage drop on the order of 4 volts in
> there somewhere.  For starters (no pun intended), it sounds like you
> have about a 2 volt drop between the +batt and the input side of the
> master relay (assuming that your "voltage from power in of master" was
> referenced to battery ground). You should have very little there since,
> assuming your battery and master solenoid are in the nose like most
> everyone else's, the cable is very short...should be more on the order
> of less than .1 volts.
>
>
>
> Lou Stedman wrote:
>> I agree Brian but there is very little drop across the solenoids. I am
>> thinking wire connectors.
>>
>> Lou Stedman
>> Velocity N7044Q
>> Olean, NY
>> ----- Original Message ----- 
>> From: "Brian Michalk" <michalk at awpi.com>
>> To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
>> Sent: Wednesday, October 08, 2008 3:41 PM
>> Subject: Re: REFLECTOR: starter trouble
>>
>>
>>
>>> Batt- to engine block: .6v
>>> That's probably the best case scenario for voltage drop with the current
>>> for that test.
>>> Measure from Batt+ to starter+.  From your data, that number should be
>>> close to 3.4v.
>>> Try to get that 3.4v drop as close as possible to your ideal .6 volt 
>>> drop.
>>>
>>> Your ground return probably has two connections, and one wire.   Battery
>>> to wire connection, and wire to engine connection.  That's close to the
>>> ideal.
>>> Your positive side has more connections: batt-wire-solenoid,
>>> solenoid-wire-starter.  Four connections, two wires, and the wire length
>>> is probably longer.  From your data, it looks like you need to look at
>>> the batt to solenoid section.
>>>
>>> Try minimizing your voltage drops.
>>>
>>> Lou Stedman wrote:
>>>
>>>> Well I finally ran all of the tests on my starting system to find out
>>>> why my started is having so much trouble turning over this engine. As
>>>> I discussed before, I have a IO-360 on my VEL. My starter is a SkyTec
>>>> LS. When I hold my key to start the starter will begin to turn , then
>>>> hesitate and I let off on the key. Eventfully it will turn over. When
>>>> it does it spins the prop fine and the engine starts at once. I
>>>> downloaded the troubleshooting guide that SkyTec has and I wanted to
>>>> share my findings. All of the voltage readings are taken when the
>>>> started begins to loge down.
>>>>
>>>> 1.Voltage from plus and minus posts of battery while in failure
>>>> mode           9.9 volts
>>>> 2. voltage from ground on engine and + post of
>>>> starter                                     5.9 volts
>>>> 3. voltage from power in of master
>>>> solenoid                                                      8.0 volts
>>>> voltage from out side of master
>>>> solenoid                                                       8.0 
>>>> volts
>>>> voltage from power in of starter
>>>> solenoid                                                       8.0 
>>>> volts
>>>> Voltage from power out side of starter
>>>> solenoid                                           8.0 volts
>>>> 4. Voltage from minus side of battery to engine
>>>> block                                  0.6 volts
>>>> 5. Voltage at battery before starter
>>>> engage                                                   13.2 volts
>>>>
>>>> Things I have tied:
>>>>
>>>> Removed and cleaned all connections.                           Results: 
>>>> 0
>>>> Replaced my existing battery (Interstate 462 C.A.)
>>>> Installed new Power Sonic Battery PS12400 (40AH, 435 C.A.) Results: 0
>>>> Starter was returned to SkyTec for new housing and check.
>>>> Results: OK
>>>>
>>>> My next step is to replace all of my connections with new copper
>>>> connectors and solder them on.
>>>>
>>>> Your input is greatly appreciated.
>>>>
>>>>
>>>> Lou Stedman
>>>> Velocity N7044Q
>>>> Olean, NY
>>>> ------------------------------------------------------------------------
>>>>
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>>
>>
>> --------------------------------------------------------------------------------
>>
>>
>>
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>
> -- 
> Dave Philipsen
> Velocity STD-FG
> N83DP
>
> _______________________________________________
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>
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