Hey folks, it's a bit OT, but I was hoping the PM community might have the experience and technical rigor to give me a good answer.
The item under discussion is a "fluid flywheel" which is used in the Ferret scout car from the 1950s.
Basically it's like a torque converter but without the third member so it just acts as a variable coupling. The usual fluid is in the ISO 10-15 range, and should tolerate a fair bit of heat.
I've looked at MSC/McMaster and seen several options around light hydraulic fluid and spindle oil. I also notice some air tool oil that is in the viscosity range and has a bit higher operating temperature than most of the other oils listed. I need a couple gallons and it could be I'll have to change it out fairly soon, so more like a 5-gallon pail ideally. I'm wondering what would be ideal but also what won't break me financially.
McMaster has this:
Mobil DTE21 ISO15 $180/5-gallon with temp range 0 to 150F and supposedly protects against wear
Spindle/bearing oil jugs of ISO-10 of the house brand for just $20 and is rated from -10 to 150F
Mobil Velocite No6. is $30/gallon and is rated from 25F to "not rated"
generic ISO 15 bearing/spindle oil for under $18/gallon with a temp range of -10 to 150F
"jack oil" with, I gather some additives to protect against corrosion and wear. Of course it has a lower temperature range of just -30 to +135 and is $64/gallon
Mobil DTE 10 Excel 15—Mineral Base Oil is also supposed to protect against wear and has the usual range of -45 to 150F and is only offered in 5-gallons for $177
"air-tool oil" in ISO 15 is $13 for just 20-OZ but supposedly has a temperature range of -15 to 250F and will absorb moisture, not sure if that's an asset or liability in this use.
MSC has similar offerings, the first several I checked were more expensive but found some comparable options with some digging:
Mineral hydraulic/machine oil in ISO 15 for $60/gallon or $180/5gallons
ISO 10 spindle oil which is only $50/gallon or $200/5 gallons.
ValCool Mineral Spindle Machine Oil ISO-10 is $98/5-Gallons
Below is a description of the device and it's operation:
The flywheel comprises a sealed chamber filled with hydraulic fluid (typically OM13 ISO10 light oil. ISO15 Shell Tellus Tx15 can also be used) containing an impeller(the pump) driven by the engine and a turbine connected to an output shaft. The impeller is a toroid disc connected to the engine's crankshaft.The fluid flywheel is completely automatic in action. The bowl-shaped rear casing, facing forward, is the driving member which completely encases the driven member. The turbine situated at the rear of the flywheel nearest the engine and attached to the input shaft of the gearbox, is the driven member.Sectioned and exploded diagrams can both be downloaded here.As the oil spins upwards and around in a toroidal motion it takes the energy from the driving turbine as it flows from the centre to the rim,delivering energy to the driven member as it passes from the circumference to the centre. By shaping pockets in the driving bowl or pumping turbine, the oil is thrown out as jets at high speed into the driven member.This impact, directed at a tangent, causes the driven member to turn in the same direction as its neighbour. The fluid flywheel forms a flexible coupling between the engine and gearbox.
The item under discussion is a "fluid flywheel" which is used in the Ferret scout car from the 1950s.
Basically it's like a torque converter but without the third member so it just acts as a variable coupling. The usual fluid is in the ISO 10-15 range, and should tolerate a fair bit of heat.
I've looked at MSC/McMaster and seen several options around light hydraulic fluid and spindle oil. I also notice some air tool oil that is in the viscosity range and has a bit higher operating temperature than most of the other oils listed. I need a couple gallons and it could be I'll have to change it out fairly soon, so more like a 5-gallon pail ideally. I'm wondering what would be ideal but also what won't break me financially.
McMaster has this:
Mobil DTE21 ISO15 $180/5-gallon with temp range 0 to 150F and supposedly protects against wear
Spindle/bearing oil jugs of ISO-10 of the house brand for just $20 and is rated from -10 to 150F
Mobil Velocite No6. is $30/gallon and is rated from 25F to "not rated"
generic ISO 15 bearing/spindle oil for under $18/gallon with a temp range of -10 to 150F
"jack oil" with, I gather some additives to protect against corrosion and wear. Of course it has a lower temperature range of just -30 to +135 and is $64/gallon
Mobil DTE 10 Excel 15—Mineral Base Oil is also supposed to protect against wear and has the usual range of -45 to 150F and is only offered in 5-gallons for $177
"air-tool oil" in ISO 15 is $13 for just 20-OZ but supposedly has a temperature range of -15 to 250F and will absorb moisture, not sure if that's an asset or liability in this use.
MSC has similar offerings, the first several I checked were more expensive but found some comparable options with some digging:
Mineral hydraulic/machine oil in ISO 15 for $60/gallon or $180/5gallons
ISO 10 spindle oil which is only $50/gallon or $200/5 gallons.
ValCool Mineral Spindle Machine Oil ISO-10 is $98/5-Gallons
Below is a description of the device and it's operation:
The flywheel comprises a sealed chamber filled with hydraulic fluid (typically OM13 ISO10 light oil. ISO15 Shell Tellus Tx15 can also be used) containing an impeller(the pump) driven by the engine and a turbine connected to an output shaft. The impeller is a toroid disc connected to the engine's crankshaft.The fluid flywheel is completely automatic in action. The bowl-shaped rear casing, facing forward, is the driving member which completely encases the driven member. The turbine situated at the rear of the flywheel nearest the engine and attached to the input shaft of the gearbox, is the driven member.Sectioned and exploded diagrams can both be downloaded here.As the oil spins upwards and around in a toroidal motion it takes the energy from the driving turbine as it flows from the centre to the rim,delivering energy to the driven member as it passes from the circumference to the centre. By shaping pockets in the driving bowl or pumping turbine, the oil is thrown out as jets at high speed into the driven member.This impact, directed at a tangent, causes the driven member to turn in the same direction as its neighbour. The fluid flywheel forms a flexible coupling between the engine and gearbox.