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Truckboy
Dodge Dakota
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2/19/2004
13:15:25
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 Subject: Camshaft
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Message:
I know the firing order of the 3.9 but does anybody know the angle between each cylinder fire?
It's an odd fire V6 but haven't found the exact angle between each one.
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nope
Dodge Dakota
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2/19/2004
14:55:43
| RE: Camshaft
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Message:
it's an even fire v6 that fires every 120 degrees of crankshaft rotation.
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gen1dak
Dodge Dakota
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2/19/2004
20:06:04
| RE: Camshaft
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Message:
NOT! Did ya try the math on that? 6 cylinders, 4 cycles, 120 degrees? That doesn't add up.
The crankpins are split, and offset by 22 degrees. This results in firing intervals that alternate between 128 degrees and 112 degrees.
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gestalt
Dodge Dakota
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2/19/2004
21:14:06
| RE: Camshaft
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Message:
How would you know if you had an odd or an even fire? First I've heard of this.
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brandon
Dodge Dakota
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2/19/2004
21:54:15
| RE: Camshaft
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Message:
it would be every 60 because 360 divided by 6 equals 60 duh
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gen1dak
Dodge Dakota
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2/19/2004
22:13:45
| RE: Camshaft
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Message:
Ever heard of the Factory Service Manual?
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J and J Auto
GenII
2/19/2004
22:37:28
| RE: Camshaft
IP: Logged
Message:
crank 120 X 3 = 360
360 degrees is a full circle where did you learn
mathmatics
60 degree dist rotaition for each cyl
60 X 6 = 360 again a full circle or 720 degrees
rotation for all 6 cyls to fire 4 stroke
Larry
J&J Auto
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gestalt
Dodge Dakota
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2/19/2004
23:42:58
| RE: Camshaft
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Message:
Laughs
What goes around comes around...
Just like a CIRCLE. That would be 360 degrees for that unmathamacated peep.
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gen1dak
Dodge Dakota
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2/19/2004
23:48:37
| RE: Camshaft
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Message:
Yes, THAT adds up, but as I have already explained, the 3.9 is not set up as an even-fire system, thus, 120-720 does not add up. This is usually attributed to the misnomer that the 3.9 is simply a 5.2 with 2 cylinders lopped off....it isn't that simple. If one can imagine lopping off the front half of the forward cylinders of the 5.2, and the trailing half of the rear cylinders, then offsetting the crank and re-forming the cylinders on the new center, you have the 3.9. This is why it's an odd fire set-up.
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Wadak
Dodge Dakota
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2/21/2004
07:26:52
| RE: Camshaft
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Message:
All of these are truly revolutionary ideas.
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Truckboy
Dodge Dakota
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3/02/2004
18:04:22
| RE: Camshaft
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Message:
Thanks for the arguments ooops I mean answers. So whats the verdict? degrees in between each fire in the 'odd fire' V6?
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gen1dak
Dodge Dakota
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3/02/2004
22:46:07
| RE: Camshaft
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Message:
I have already answered this question.
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