Thanks to howstuffwork dotcom I have found that the constant 5252 =33,000/(2*pi). Remember that 1 Hp is defined as the ability to lift 33,000 pounds 1 foot in 1 minute. I just don't know how efficient the torque formula is over a broad range of piston surface areas, piston strokes and RPM ranges. This engine has a 10" bore which gives a piston surface area of roughly 78 sq. inches. Given a peak cyl. pressure of even 500 psi this gives a linear force of 39,000lb at 1.083 inches from center.
Remember though that this is only peak pressure and is acting over only part of a revolution and the rotational force applied to the crank changes not only with cylinder pressure but also with crank angle. I just don't see how such a short formula could resolve all of these variables. Boy, I have a headache!
@SH1974 According to mathematical formulas. If this engine has 200 hp at 325 rpm, It has around 3200 lb ft of torque. seems possible, but I could be wrong.
@mopar43v3r Hey mopar4v3r, I don't know if this is correct or not. I guess you used the formula (HP x 5252) / RPM, I don't know the mathematical basis for the 5252 constant so I don't know if it would apply to a low speed long stroke engine. The most accurate mathematical formula is several pages long and involves cylinder pressures and crank throw etc. I have an e-mail in to a company on Lopez Isl. WA. who may know the torque spec.
@mopar43v3r I just heard back from the local old diesel guy, he doesn't know the torque specs either and just used the words "a lot" to describe the specs. He also stated that low speed diesels are more efficient than the high speed engines. My view is that with large displacement engines you have a larger piston top surface for combustion pressures to act on, you have a longer crank arm for multiplying torque and thus can utilize much lower peak pressures. This means lower fuel consumption. ?
are u sure the long one isn't HP as HP at one time was based on cylinder capacity etc, where as BHP must be measured, be it piezoelectric head bolt washers to measure force like modern ship engines often have or its torque x rpm/ constant. if it were torque x constant/ rpm the figure would be way high.
@tpvalley I believe it was torque. I was certainly searching for torque specs when I found the page. I have however cleared my browser history since viewing the page.
what amazes me is that this beast has six massive cylinders, puts out 200 horse, and only uses three gallons per hour?!? my 45 horse diesel tractor uses 2 GPH... how is that possible?
@themadmailler Can't enplane it as I have not studied thermodynamics. It is possible that the sign is incorrect . I would think that it would be a difference in thermal efficiency. If there are any engineers out there maybe they can help.
Thanks Connor!
scotty2307 1 month ago
awesome!!! Theres one of these at the borax museum in death valley callifornia, I just came back from there.
SuperKONR 1 month ago
Thanks to howstuffwork dotcom I have found that the constant 5252 =33,000/(2*pi). Remember that 1 Hp is defined as the ability to lift 33,000 pounds 1 foot in 1 minute. I just don't know how efficient the torque formula is over a broad range of piston surface areas, piston strokes and RPM ranges. This engine has a 10" bore which gives a piston surface area of roughly 78 sq. inches. Given a peak cyl. pressure of even 500 psi this gives a linear force of 39,000lb at 1.083 inches from center.
scotty2307 3 months ago
Remember though that this is only peak pressure and is acting over only part of a revolution and the rotational force applied to the crank changes not only with cylinder pressure but also with crank angle. I just don't see how such a short formula could resolve all of these variables. Boy, I have a headache!
scotty2307 3 months ago
Wow, that is about 15,6 liters capacity, per cilynder -
and this engine has 6 of them...
So it has about 94l capacity!
Now that is real huge!!!
I wonder how much torque this engine produces,
but I bet, it would be difficult to find a dyno that's strong enough...
;-)
What did it drive in origin? A big ship or a generator, maybe some machines (driven by transmission belts) in a big mecanical manufacture?
SH1974 3 months ago
@SH1974 Yes, a big impressive engine and it starts easily even when cold. It was originally installed in a tug boat.
scotty2307 3 months ago
@SH1974 According to mathematical formulas. If this engine has 200 hp at 325 rpm, It has around 3200 lb ft of torque. seems possible, but I could be wrong.
mopar43v3r 3 months ago
@mopar43v3r Hey mopar4v3r, I don't know if this is correct or not. I guess you used the formula (HP x 5252) / RPM, I don't know the mathematical basis for the 5252 constant so I don't know if it would apply to a low speed long stroke engine. The most accurate mathematical formula is several pages long and involves cylinder pressures and crank throw etc. I have an e-mail in to a company on Lopez Isl. WA. who may know the torque spec.
Regards; SM
scotty2307 3 months ago
@scotty2307 I'm not sure either, just used the formula as a ballpark for what it could be. I'm curious to know the actual torque numbers too.
mopar43v3r 3 months ago
@mopar43v3r I just heard back from the local old diesel guy, he doesn't know the torque specs either and just used the words "a lot" to describe the specs. He also stated that low speed diesels are more efficient than the high speed engines. My view is that with large displacement engines you have a larger piston top surface for combustion pressures to act on, you have a longer crank arm for multiplying torque and thus can utilize much lower peak pressures. This means lower fuel consumption. ?
scotty2307 3 months ago
@scotty2307
are u sure the long one isn't HP as HP at one time was based on cylinder capacity etc, where as BHP must be measured, be it piezoelectric head bolt washers to measure force like modern ship engines often have or its torque x rpm/ constant. if it were torque x constant/ rpm the figure would be way high.
2 x 3 = 6, 2 x 6 = 12!
tpvalley 3 months ago
@tpvalley I believe it was torque. I was certainly searching for torque specs when I found the page. I have however cleared my browser history since viewing the page.
scotty2307 3 months ago
what amazes me is that this beast has six massive cylinders, puts out 200 horse, and only uses three gallons per hour?!? my 45 horse diesel tractor uses 2 GPH... how is that possible?
themadmailler 1 year ago
@themadmailler Can't enplane it as I have not studied thermodynamics. It is possible that the sign is incorrect . I would think that it would be a difference in thermal efficiency. If there are any engineers out there maybe they can help.
Regards; Scotty
scotty2307 1 year ago
Atlas, I could watch them run all day. Really good video. Phil
farmerphil 1 year ago