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GM Detroit 6-71 Delco Generator


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  #21  
Old 02-26-2017, 02:05:18 PM
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Default Re: GM Detroit 6-71 Delco Generator

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Detroit Diesel.....the most efficient method of converting diesel fuel to noise.
Smoke too, don't forget the smoke!!!!
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  #22  
Old 02-26-2017, 02:25:27 PM
BHoward BHoward is offline
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Default Re: GM Detroit 6-71 Delco Generator

Vanman ,I'm prity sure it was,nt running 3600 , just sounded like 3600. Cheers Bill H.
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  #23  
Old 02-26-2017, 02:56:03 PM
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Default Re: GM Detroit 6-71 Delco Generator

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Vanman ,I'm prity sure it was,nt running 3600 , just sounded like 3600. Cheers Bill H.
Exactly! That was the point at which I grinned and told him about two stroke Detroits, and that it was probably running right around 1800 rpm.

Indeed it's a matter of what the ear is used to. A friend bought a five ton military truck that had been fitted with a 671. I followed behind as he got on the road and went through the gears, topping out at 25 mph. After a few minutes of this he pulled off and said that's as fast as it goes! I grinned and said, "did you look at the tach???"

Even though the 671 was his favorite engine, he had never actually operated one, and his ear was telling him that he was turning around 2,000 rpm. Nope!
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Old 02-26-2017, 03:07:24 PM
Wayne 440 Wayne 440 is online now
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Default Re: GM Detroit 6-71 Delco Generator

How to drive a 2 stroke Detroit-

(1) Kick tires, stubbing toe on at least one rim.

(2) Get in cab, slam hand or finger in door.

(3) Drive away.
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  #25  
Old 02-26-2017, 05:02:30 PM
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Default Re: GM Detroit 6-71 Delco Generator

My friend has a Feed and Grain mill just north of me. Before he bought the Kenworth that he has now, he had a 1975 Freightliner with a 440HP, turboed and supercharged, 8V92. He taught me how to drive truck with it. The MAJOR rule was that the engine HAD to be kept between 1800 and 2100 RPM.... PERIOD. It was a runner! He retired it and bought TWO brand new 2001 Kenworths with the 550HP, 60 series, 6 cylinder Detroit engines. It was weird riding in them after the 8V92 because we would be pulling small grades and the RPM was between 1200 and 1400. You could feel the rumble in the floor boards. He still has both of them other than he had to do the exhaust retrofit.
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Old 02-26-2017, 05:53:24 PM
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Default Re: GM Detroit 6-71 Delco Generator

It actually is not possible to supercharge a Detroit, as the exhaust valves close after the inlet ports are closed. The blower is only for scavenging. Functionally- and elegantly- replacing the exhaust and intake strokes of a four stroke engine.

The turbo works because the exhaust back pressure of the turbine gives the compressor something to "push" against.

Keeping the rpm high is a bit of a myth. More accurately the rpm and throttle should be in proportion to each other. But that is true of most any engine, and especially those with fixed timing like a Detroit. And indeed if you look at the performance specs for some of them, peak torque might be as low as 1200 rpm.

I recall riding in EMD locomotives (just big Detroits) that the engine speed is proportional to load. In the lowest power setting, Run 1, the engine loads at idle speed and actually slows down a bit as it takes the load.

When I used to drive a bus with a 671 I would shift up at just over idle when the load was light and the need for more power was not anticipated. Like driving in traffic or a neighborhood.

The 671 idled at 500, no reason to suddenly increase that to 1800 just because a slight load is applied.

I believe that the myth of keeping them revved up was started by people used to driving four strokes trying to drive them by ear. Like happened to my friend and his truck that "would only go 25 mph".
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Old 02-26-2017, 06:35:32 PM
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Default Re: GM Detroit 6-71 Delco Generator

Isn't any smoother generator engine than a two stroke Detroit V-12 due to the power pulses sent to the crankshaft every revolution.
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  #28  
Old 02-26-2017, 08:22:39 PM
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Default Re: GM Detroit 6-71 Delco Generator

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Originally Posted by Vanman View Post
It actually is not possible to supercharge a Detroit, as the exhaust valves close after the inlet ports are closed. The blower is only for scavenging. Functionally- and elegantly- replacing the exhaust and intake strokes of a four stroke engine.

The turbo works because the exhaust back pressure of the turbine gives the compressor something to "push" against.

Keeping the rpm high is a bit of a myth. More accurately the rpm and throttle should be in proportion to each other. But that is true of most any engine, and especially those with fixed timing like a Detroit. And indeed if you look at the performance specs for some of them, peak torque might be as low as 1200 rpm.

I recall riding in EMD locomotives (just big Detroits) that the engine speed is proportional to load. In the lowest power setting, Run 1, the engine loads at idle speed and actually slows down a bit as it takes the load.

When I used to drive a bus with a 671 I would shift up at just over idle when the load was light and the need for more power was not anticipated. Like driving in traffic or a neighborhood.

The 671 idled at 500, no reason to suddenly increase that to 1800 just because a slight load is applied.

I believe that the myth of keeping them revved up was started by people used to driving four strokes trying to drive them by ear. Like happened to my friend and his truck that "would only go 25 mph".
Supercharger and blower mean the same thing to me.... This friend that had the two stroke Detroits is 74 yrs old now and until 2001 when he bought the KW's, all he had were two stroke Detroits. His Dad opened up the feed mill in 1946. Also, when ever I drove the rig, we were at 80,000 pounds gross.
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Old 02-26-2017, 11:41:41 PM
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Default Re: GM Detroit 6-71 Delco Generator

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Originally Posted by Vanman View Post
Oh, this was a long time ago. I wish I had more details, but I was an electrician on the job and would not have noticed the welder at all were it not for the sweet music it was making.

But there's no mistaking the sound of a two stroke six. The thing was big too. I'm sure it was on a two axle trailer. Funny, I asked a fellow I was working with, what rpm he'd guess it was running. He said 3600?
I'm researching and looking for all the info of manufacturers that ganged dc welding generators together and their power units. Seems not a lot of info about these twin units out there. thanks for responding.
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Old 03-03-2017, 11:45:38 PM
Seafarer12 Seafarer12 is offline
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Default Re: GM Detroit 6-71 Delco Generator

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Originally Posted by Vanman View Post

I recall riding in EMD locomotives (just big Detroits) that the engine speed is proportional to load. In the lowest power setting, Run 1, the engine loads at idle speed and actually slows down a bit as it takes the load.
There isn't anything as sweet sounding as a EMD V16 running at 720 rpm fully loaded. I use to run two 1250kw gen sets with EMD's they had 4, 4 to 6 inch exhaust pipes about 4 ft long with clappers on top. They were side by side. you get both of them screaming it was an experience even with ear plugs and muffs.
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