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Discussion in 'EFI Topics' started by Jwooky, Jan 27, 2014.
Anyone know who makes the in tank thermister?
Any numbers on the Thermistor
My understanding is the fuel pump setup in the Big Dog is very similar to Victory.
Dont know how, but mine is missing???
The can is was potted in is there, but the thermister/wire/connector is gone.
It is not part of the fuel pump assy.
That is odd
I did some research but couldn't find any under $30.
I'm waiting on a quote from a supplier overseas, seems like America makes almost nothing anymore.
At least they still make Kaptins!!
Thank you, look forward to hearing from you.
Contact Rylan Vos at The Vic Shop. He specializes in rebuilding Victory fuel pump assemblies. He may have a source. email@example.com
S@S sells a replacement thermister for our bikes. Part number 55-5087.
S&S worthless!! Called, even though its in their 2015 Catalog, its obsolete per the rep on the phone..
Needless to say... Called Rylan Vos at the Vic Shop above...
Vic Dealer part number 2520678 about $35 bucks!! BOOM!! Big shout out to Rylan and Tdubb for the info!! The Vic dealer might tell you Vic part numbers are 7 digits, tell him to look it up, its in his IPB if he gives you any grief like the one locally did... If they punch it in, and nothing shows up, chances are they have never ordered one before, which was the case here in AZ with the dealer I called...
Seems like some " dealers" just want to push new bikes, and don't have time to help parts customers. That's how the local H D superstore seems to be. Needed a rear turn lite for a sporty and the parts counter said they couldn't get it. Went 40 miles away to another store and they had 4 in stock, didn't even have to look part number up in the book Well worth the trip!
Ok.................. I need to ask...... WTF is a "thermister"?????
Oh right!!! Silly me....
Assuming, as a first-order approximation, that the relationship between resistance and temperature is linear, then:
, change in resistance
, change in temperature
, first-order temperature coefficient of resistance
Thermistors can be classified into two types, depending on the classification of .
This coefficient should not be confused with the parameter below.
Main article: Steinhart–Hart equation
In practice, the linear approximation (above) works only over a small temperature range. For accurate temperature measurements, the resistance/temperature curve of the device must be described in more detail. The Steinhart–Hart equation is a widely used third-order approximation:
where a, b and c are called the Steinhart–Hart parameters, and must be specified for each device. T is the absolute temperature and R is the resistance. To give resistance as a function of temperature, the above can be rearranged into:
The error in the Steinhart–Hart equation is generally less than 0.02 °C in the measurement of temperature over a 200 °C range. As an example, typical values for a thermistor with a resistance of 3k Ω at room temperature (25 °C = 298.15 K) are:
B or β parameter equation
NTC thermistors can also be characterised with the B (or β) parameter equation, which is essentially the Steinhart–Hart equation with , and ,
Where the temperatures are in kelvin and R0 is the resistance at temperature T0 (25 °C = 298.15 K). Solving for R yields:
This can be solved for the temperature:
etc etc etc........................................
Lol, or in simple terms a resister that changes resistance with temperature.
Same device your car uses to display temperature.
S&S has them but they don't like to sell direct to consumers. You will likely have to go through a S&S dealer.
I knew it, I just knew it! Sven is really Franco in disguise!
Actually, I was expecting Sven to jump in..... @Sven Where are you???? please throw some light in here!
I'll take a 'crack' at it. From one diode to another, there is this 'Doping' of a chemical onto/into a metal/crystal. For a metal, static electricity will take out a blackbox, you needing to ground yourself to the case of the computer tower before you touch internal components. What happens is it raises that doping layer 'magnetically off the part' = Junk.
Liquid wise, 'Hanging with Franco' schooled me on Bariumcobalt fluoride. Basically a crystal with a reaction to being magnetically perfect in crystal form at 'room temp.' Then, you apply current to it, the heat then magnetically uncouples the crystals, breaks down in resistance as temp rises, a.k.a., the curie point.
You can work both actions being AC driven so I could make a water temp sensor, let the heat via water temp rising, magnetically break down the crystal inside the sensor, magnetically contracts back when brought back to room temp. Meanwhile, the gauge is responding to the change in heat.
I could add heat to it, magnetically break it down as it is submerged in fuel. My idea is to run a long toothpick in diameter of a metal probe; up inside the tank. The prob is exposes to air [no longer being cooled in liquid], where this crystal part moves back to room temp. This resistance inside the probe is receiving a new resistance in a different heat change. This change or exposure; reads as a gas gauge showing the more the probe is exposed to air, the more crystal coverts this value to reading less gas.
Something like that... How close am I?
I knew you wouldn´t disappoint me.... Now I understand it!!! (Wikipedia really talks funny sometimes!)
A Thermister - "In simple terms" - Activates the Low Fuel light - HAHAHA
Thanks for the great lead, guys....I just called the local Victory dealer to order part # 2520678 and should have my thermistor Thursday.....just in time to compliment the D O C's ECH install. Now my low fuel light will glow as it should.
Hang on Rick, what did I miss you getting rid of the cold issue EHC? Or did it die?
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