1929 Atlas Imperial diesel.

Originally installed in a tugboat which operated on the Columbia river, this engine was saved from the scrap pile and restored to magnificent condition for all of us to enjoy.
This engine now resides at Berthused Memorial Park in Lynde, WA. and is run every year during the annual Puget Sound Antique Tractor Assn. Threshing "B".

Category:

Autos & Vehicles

Tags:

• 1929
• Atlas
• Imperial
• Diesel

[scotty2307]

Thanks Connor!

[scotty2307]

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]

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!

[SuperKONR]

awesome!!! Theres one of these at the borax museum in death valley callifornia, I just came back from there.

[scotty2307]

@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.

[tpvalley]

@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!

[scotty2307]

@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. ?

[mopar43v3r]

@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.

[scotty2307]

@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

[mopar43v3r]

@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.