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Old 09-17-2016, 11:10 PM   #21
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Dmg-6

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Originally Posted by RickB View Post
My tug had a DMG-6 (direct reversing - 400HP @ 400 RPM) for power. I used to start it sometimes just to listen to it run.

Sigh ...
by chance, do you remember how many gallons per hour it burned?
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Old 09-18-2016, 05:14 AM   #22
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Quote:
Originally Posted by charles View Post
According to the article 1,660 GPH with %50 efficiency, automobile engines abt %35
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Originally Posted by meesterpearson View Post
by chance, do you remember how many gallons per hour it burned?
it's a very old thread, but the answer was here in post 8.

You're welcome...
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Old 09-18-2016, 01:38 PM   #23
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it's a very old thread, but the answer was here in post 8.

You're welcome...
I was referring to the DMG-6 in your old tug. I am looking at an old tug with one. Thanks!
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Old 09-18-2016, 01:57 PM   #24
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5.6M ft Lbs, I would be scared if the prop got stuck the boat would start spinning!! That is very impressive, here is some more fun facts for gear heads!!


TOP FUEL DRAGSTER FAST FACTS:
ACCELERATION PUT INTO PERSPECTIVE
  • One Top Fuel dragster 500 cubic inch Hemi engine makes more horsepower than the first 4 rows at the Daytona 500.
  • Under full throttle, a dragster engine consumes 1-1/2 gallons of nitromethane per second; a fully loaded 747 consumes about the same amount of jet fuel with 25% less energy being produced.
  • A stock Dodge Hemi V8 engine cannot produce enough power to merely drive the dragster's supercharger.
  • With 3000 CFM of air being rammed in by the supercharger on overdrive, the fuel mixture is compressed into a near-solid form before ignition. Cylinders run on the verge of hydraulic lock at full throttle.
  • At the stoichiometric 1.7:1 air/fuel mixture for nitromethane, the flame front temperature measures 7050 degrees F.
  • Nitro methane burns yellow. The spectacular white flame seen above the stacks at night is raw burning hydrogen, dissociated from atmospheric water vapor by the searing exhaust gases.
  • Dual magnetos supply 44 amps to each spark plug. This is the output of an arc welder in each cylinder.
  • Spark plug electrodes are totally consumed during a pass. After halfway, the engine is dieseling from compression plus the glow of exhaust valves at 1400 degrees F. The engine can only be shut down by cutting the fuel flow.
  • If spark momentarily fails early in the run, unburned nitro builds up in the affected cylinders and then explodes with sufficient force to blow cylinder heads off the block in pieces or split the block in half.
  • Dragsters reach over 300 MPH before you have completed reading this sentence.
  • In order to exceed 300 MPH in 4.5 seconds, dragsters must accelerate an average of over 4 G's. In order to reach 200 MPH well before half-track, the launch acceleration approaches 8 G's.
  • Top Fuel engines turn approximately 540 revolutions from light to light!
  • Including the burnout, the engine must only survive 900 revolutions under load.
  • The redline is actually quite high at 9500 RPM.
  • THE BOTTOM LINE: Assuming all the equipment is paid off, the crew worked for free, and for once, NOTHING BLOWS UP, each run costs an estimated $1,000 per second.
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Old 09-18-2016, 02:11 PM   #25
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Can anyone calculate the gallons of fuel used in a single cylinder for one power stroke?
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Old 09-18-2016, 02:24 PM   #26
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14 cyl, 1660 GPH at 102 RPM
118.57 GPH per cyl


two stroke 102 RPM = 51 power strokes per min or 3060 PH


118.57 / 3060 = .0387 Gallons per stroke?


Math is not my strong point so all of that is suspect!!




So for all 14 cyl that would be .542 Gallons per stroke for the engine I think
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Old 09-18-2016, 06:11 PM   #27
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Doesn't a 2 stroke fire every rev?
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Old 09-18-2016, 06:17 PM   #28
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Not sure, i know its 2 strokes per revolution, so i guess your right. So got to double my numbers then.
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Old 09-19-2016, 06:12 AM   #29
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For folks with Detroit 2 strokes , the injectors come with a "CC" rating.

It is the amount of fuel pumped in 1,000 injections not just one.
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Old 09-19-2016, 10:37 AM   #30
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1660gph/14 cyl is 118gph per cyl

102rpm is 6120 hits per hour

118gph/6120hits per hour is 0.019gal/hit

128oz per gal x 0.019gal/hit is 2.48oz per hit.

An old crusty ships engr told me it was a shot glass per hit on his engine. Being old, it was a smaller but similar engine. So the numbers seem to jive.
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