Ride The Bull

[Ralphy]

I have a friend wanting to build a Rat Rod diesel truck. I've maybe talked him into a 6V53 Detroit Diesel. Detroit's can run away and I'm viewing YouTube vids and I came across this beast. I think they're using an air starter check out the bottle the guy keeps his foot on.

[ame]http://www.youtube.com/watch?v=WrAeUf7v49g[/ame]

Bad ass 6v53 two stroke DD. Non turbo-ed only supercharged.
[ame]http://www.youtube.com/watch?v=BbDY3GwjrO0&playnext=1&list=PLBC957DA856203C08[/ame]

RUN AWAY Detroit Diesel! 453-T, Happens at app. 1:30 min.
[ame]http://www.youtube.com/watch?v=3NRaqgab0_w[/ame]

Once they get away you cant shut the fuel off. There's a weighted governor that locks open and fully opens the injectors. The only choice is to starve the air or pull the fuel filter and wait. LOL! Beware of putting your hands near any open super or turbo charger opening.

[ame]http://www.youtube.com/watch?v=8M1o2rpO_JY[/ame]
This one gets away at about 2:00 min.


Ralphy

 

[TimAT]

Those 2 stroke Detroit's were interesting. I've seen a couple run away. Saw one run backwards- it kicked back at the starter for some reason, caught and away we went. Sucking oil from the crankcase and running on that. Fuel was shut off. Pulled the cable for the emergency stop when the flapper fell over the supercharger it took forever to die.
I know guys that always kept a 2x3 sheet of 1/2 plywood around- just to throw over the intake.

 

[mrvette]

I have never owned or worked on any diesel, but I have heard they run on direct injection of fuel into the cylinder running some 20-1 compression and obviously the fuel is something like 1.5K lbs pressure....

so what is the problem about shutting down the fuel pump?? and IF it's mechanically driven....just shut it down on the suction side......

what is this big deal about the airflow???


:tomato::shocking::noob:

 

[Ralphy]

They manufacture most of these motors with a butterfly valve that can be tripped like Tim mentioned. The first thought is to shut down the air. However as I said most, some do not have the valve. From what I remember in VOED school there's what's called a buffer. That's what the guy in the third video is messing with. If you mis-adjust the buffer, that's what causes the runaway. It's located in the governor housing. We had one runaway. Mr. Grant my teacher found a 1 by to lay on top of the supercharger. Before that he was yelling take cover. People were running all over to hide. But it was not flat enough to stop off enough air to stall the motor completely. What happened now was the motor sucked the seals out, pulling oil from the crankcase and smoked out the whole shop. It was friggin funny as hell when I look back. It took 20 minutes to shut that beast down. By removing the fuel filter.

The big deal is when it won't shut down. Diesels run at app 2,900 rpm, when the injectors slam full open the motor goes to about 4,000 rpm and being a Detroit two stroke it sounds like it's going 8,000 rpm. Now you need to gather the courage to walk back and deal with it. It's scary as hell, LOL!

If you've ever been inside a truck diesel you can appreciate the quality and strength these motors are built to. Typical compression is about 22 to 1, the air just from compression will reach a 1,000 degrees. I think I saw where that 6V53 T made almost 800 ft. lbs. of torque. Diesels aren't HP motors they're all torque. The 53 in 6V53 is the cubic inch per cylinder. So your getting 800 lbs. from 318 cu. in.

If you've ever driven behind a city bus all noisy and smelly and typically dirty as hell. It's a Detroit Diesel. City buses were big with the DD 6-71 motors.

 

[Ralphy]

Here's a 6-71, 4 exhaust valves since the intake is done by ports in the cylinder liner and supercharger. You can see the governor housing in the bottom right corner. Watch the injector rack bounce the injectors open and closed.

[ame]http://www.youtube.com/watch?v=SSU_7DqNJJY[/ame]

Ralphy

 

[TimAT]

Detroit used all 2 stroke engines for years. The cylinders have slots in the liners that the piston dropped below to charge the cylinder with air. The supercharger pressurized the block around the cylinders. And the whole engine was an oil leak. IF there wasn't a puddle under it, it was out of oil. Even shutting the fuel off didn't always kill the engine. If the injector rack didn't go all the way to cutoff it would keep running. And if it started sucking engine oil into the cylinder charge air the engine was more than happy to burn that on the way to RPM Valhalla.

 

[SuperBuickGuy]

I saw the aftermath of a 6.2 diesel that ran away. If you put the spring in wrong in the injector pump, the valve inside will open WOT and not shut down. This motor ran away, so they vise-gripped the fuel line at the firewall. Problem was by the time the fuel was gone, it had enough heat to ignite the aluminum pistons. Then it went "boom" but it took nearly 10 minutes. All the while they were throwing everything at it to shut it down - at one point, it sucked down a phone book (the air cleaner bolts prevented it from sealing)

Good thing it was in a concrete building.... it threw shrapnel nearly 100'

 

[mrvette]

Hear I thought it was THIS!!!!!:hissyfit::gurney:

 

[Ralphy]

mrvette, very similar! Both smelly and leaky!

I remember Jesse James trying to build a truck diesel bike. I was in joy waiting to see him fall over and snap a leg in two. However it never happened. They turned it into a trike. Funny it's called a Peterbuilt, I don't see any Peterbuilt parts.

 

[TimAT]

That Jesse James thing is an NTC series Cummins. Could be a 350 or 400 horsepower. Either way, it runs close to 1000 ft/lbs. torque. And I bet it weighs close to 2000 pounds without the power steering pump.I do know it holds 11 GALLONS of oil.

 

[mrvette]

mrvette, very similar! Both smelly and leaky!

I remember Jesse James trying to build a truck diesel bike. I was in joy waiting to see him fall over and snap a leg in two. However it never happened. They turned it into a trike. Funny it's called a Peterbuilt, I don't see any Peterbuilt parts.

THAT, right there is a thing of BEAUTY.....it's almost sexy, well, sorta, almost.....

but most guys just GOTTA get off on it.....:devil::crutches:

 

[Ralphy]

That Jesse James thing is an NTC series Cummins. Could be a 350 or 400 horsepower. Either way, it runs close to 1000 ft/lbs. torque. And I bet it weighs close to 2000 pounds without the power steering pump.I do know it holds 11 GALLONS of oil.

:lol: power steering pump :lol:
Looks like the motor may have a Jake Brake installed originally also. Use that on a wet road and watch the fun!


And talking about roll bars and cages on another thread. Hmmm........