Alright guys this has been bothering me since last night and I've been trying to research it as much as possible. The V10 Viper has a unique sound which we're all aware of..I don't quite understand it yet so I thought maybe a few technical members could chime in to help me out
Dodge uses a typical cross-plane crankshaft in their V8 but by adding two cylinders would throw off the 'even-firing'. My understanding is..a 90deg V10 block requires crank pins to be spaced 72deg apart to keep that same 'even-firing'..which helps with balancing/vibration. And from what I've collected online, the Viper crankshaft is NOT designed on the 72deg crank pin design. An 'uneven-firing' order was established using a 90deg and 54deg interval which creates that unique sound. SO, this is where I'm lost. If each journal has shared pins(2 rods per journal) then how is it mathematically possible to reach exactly 720deg crankshaft rotation with every cylinder firing once? :shrug::??::shrug:See math below
Side notes:
4-stroke engines require 720deg to complete every 'stroke'
Viper crankshaft is NOT split-pin design(99% sure)
Example: (1 example of several that could be used)
3 journals(6 rods) 90deg from each other
90 x 6 = 540deg
2 journals(4 rods) 54deg from each other
54 x 4 = 216deg
540 + 216 DOES NOT equal 720deg
NOW, say one bank of 5cylinders is only 90deg and the other bank of 5 is only 54deg..
5pins 90deg from each other
90 x 5 = 450
5pins 54deg from each other
54 x 5 = 270
450 + 270 EQUALS 720deg
So, I have it figured out..right? Wrong. How can a shared pin journal have a 90deg and 54deg pin location? And like I posted before, plus I looked at pictures online, the crankshaft is not split-pin design.
Am I over thinking this? Somebody please help before I rip my hair out :bash: Also, If any technical info. I posted is incorrect, please let me know!
Dodge uses a typical cross-plane crankshaft in their V8 but by adding two cylinders would throw off the 'even-firing'. My understanding is..a 90deg V10 block requires crank pins to be spaced 72deg apart to keep that same 'even-firing'..which helps with balancing/vibration. And from what I've collected online, the Viper crankshaft is NOT designed on the 72deg crank pin design. An 'uneven-firing' order was established using a 90deg and 54deg interval which creates that unique sound. SO, this is where I'm lost. If each journal has shared pins(2 rods per journal) then how is it mathematically possible to reach exactly 720deg crankshaft rotation with every cylinder firing once? :shrug::??::shrug:See math below
Side notes:
4-stroke engines require 720deg to complete every 'stroke'
Viper crankshaft is NOT split-pin design(99% sure)
Example: (1 example of several that could be used)
3 journals(6 rods) 90deg from each other
90 x 6 = 540deg
2 journals(4 rods) 54deg from each other
54 x 4 = 216deg
540 + 216 DOES NOT equal 720deg
NOW, say one bank of 5cylinders is only 90deg and the other bank of 5 is only 54deg..
5pins 90deg from each other
90 x 5 = 450
5pins 54deg from each other
54 x 5 = 270
450 + 270 EQUALS 720deg
So, I have it figured out..right? Wrong. How can a shared pin journal have a 90deg and 54deg pin location? And like I posted before, plus I looked at pictures online, the crankshaft is not split-pin design.
Am I over thinking this? Somebody please help before I rip my hair out :bash: Also, If any technical info. I posted is incorrect, please let me know!
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