Never heard this before...have you?
09-13-2006, 08:22 AM
#1
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Never heard this before...have you?
In talking to a friend of mine the other day, he made the comment that diesel engines are installed in todays trucks about 8* or 10* off center (read as leaned over), and this helps to "detune" the engine. And that if you could straighten it to closer to 0* in the engine bay that you can realize HP gain from this. Now this sounds kinda like a Ferd owns "Cummings" kinda thing to me, but I just wanted to see if anyone else had ever heard this...?
09-13-2006, 09:31 AM
#2
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Years ago when the 220 cummins (NH series engines I believe, 855 cu. in.) was the thing to have in a truck it was installed at an angle for the simple reason it would not fit any other way, on certain truck cabs, especially the shorter nosed trucks where the engine sat part way into the cab, it was too tall to install @0* and the 'dog house' was too close to the drivers legs so they set it over on its side alittle to make some room in there.
It certainly has nothing to do with "tuning" or "detuning".
It certainly has nothing to do with "tuning" or "detuning".
09-13-2006, 01:01 PM
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No - those are actually slanted for the southern-hemisphere markets - gives more power than in the northern-hemispheres, required due to poor fuel quality down there.
Probably due to the way fuel rotates clockwise as it pours into a tank in the nothern hemisphere, but rotates counter-clockwise in the southern hemisphere.
Same with oil, water, and other liquids.
You must be careful right on the equator, however, because the inclination causes power to vary uncontrollably, depending on which side of the road you're on - 'nuther words, whether you're comin' or goin', or even tryin' to pass.....................
Probably due to the way fuel rotates clockwise as it pours into a tank in the nothern hemisphere, but rotates counter-clockwise in the southern hemisphere.
Same with oil, water, and other liquids.
You must be careful right on the equator, however, because the inclination causes power to vary uncontrollably, depending on which side of the road you're on - 'nuther words, whether you're comin' or goin', or even tryin' to pass.....................
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09-13-2006, 01:18 PM
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Yes! the Coriolis Effect! That's why, when you cross the equator, you must hit it at exactly 90 degrees, or the vehicle will tear itself in half (not on one of our trucks, of course) as the front and rear halves are trying to rotate in opposite directions - and the fuel problem, of course, a small tornado is created in the line when the rotational direction changes!
09-13-2006, 02:55 PM
#9
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I was told that if I drive my straight six Cummins across the equator I would have to do so in reverse and hit it at a 45 degree angle or the truck wouldn't make it across without the pistons falling out the bottom.
It will not matter what angle the engine operates at in relation to power output.....unless you lean her over too far and dump all the oil out the breather - then you can expect a very noticable decrease in power.
It will not matter what angle the engine operates at in relation to power output.....unless you lean her over too far and dump all the oil out the breather - then you can expect a very noticable decrease in power.
09-13-2006, 03:04 PM
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R u sure ? I heard that if the crank didn't have to push the pistons straight up against the pull of gravity, the engine could make a lot more power
That's also why trucks go faster downhill than uphill..............
That's also why trucks go faster downhill than uphill..............
09-13-2006, 03:19 PM
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09-13-2006, 04:13 PM
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Even down there - ever notice how seldom you have to use your brakes goin' uphill?
Yeah - compare that to how much you're on your brakes goin' downhill, right?
It's science 101, man ........can't argue with science.........
Yeah - compare that to how much you're on your brakes goin' downhill, right?
It's science 101, man ........can't argue with science.........
