Gallery, Projects and General > The Design Shop
insight into V4 design and operation
andyf:
--- Quote from: cuog on March 08, 2011, 10:44:48 AM ---
--- Quote from: John Hill on March 07, 2011, 07:12:12 PM ---
--- Quote from: cuog on March 07, 2011, 11:18:40 AM ---ACVW firing order is 1-4-3-2(both cylinders on each head fire one after the other then it goes to the other head)
--- End quote ---
Now I am confused, how did they number the cylinders? :doh:
--- End quote ---
front of car
3 0--||--0 1
4 0--||--0 2
back of car
--- End quote ---
Now I'm confused too :scratch: . Applying 1-4-3-2 to that diagram wouldn't give you "both cylinders on each head fire one after the other then it goes to the other head".
On my Javelin, the cylinders were numbered in the same order as their respective big ends were in on the crankshaft. It was as if you had taken a straight four and made it into a flat four by swinging cylinders 1 and 3 to one side and 2 and 4 to the other side.
Andy
foozer:
front of car
2 0--||--0 1
4 0--||--0 3
back of car
Looks better, just half of a V8
Robert
cuog:
VW likes to be erm different. Part of the reasoning for this is simplicity, because of the VW firing order they need a simpler to make camshaft: Since opposing cylinders are 180deg out of rotation with one another they can use the same lobe of the cam reducing the number of lobes that must be machined in half.
Here's a photo of the crankshaft:
And some engine tins with the cylinder numbers on it:
The 1/2 side should be easily readable at least.
While it would be cool to turn this into a 90deg V it would require more work since you couldn't just use a flat crank like the VW and you would have more lobes on the crank. If you were to use a flat crank you would get a little bit of that harley surging from firing at odd fractions of a rotation instead of every 90deg.
Some more info on the workings of the silly little VW: http://www.vct2.nl/vwtech/Pages/How%20Engine%20Works/How%20Components%20work/How%20the%20Boxer%20Engine%20Works.htm
Using the VW diagram to fire on the opposing head each time you would need a firing order of 1-3-2-4
To the OP sorry to derail your thread, I hope some of this information is at least useful to you in some way.
cuog:
--- Quote from: andyf on March 08, 2011, 12:16:58 PM ---
--- Quote from: cuog on March 08, 2011, 10:44:48 AM ---front of car
3 0--||--0 1
4 0--||--0 2
back of car
--- End quote ---
Now I'm confused too :scratch: . Applying 1-4-3-2 to that diagram wouldn't give you "both cylinders on each head fire one after the other then it goes to the other head".
Andy
--- End quote ---
Would it make more sense if I told you the firing order was 4-3-2-1?
andyf:
Yes, Cuog.
:lol: :lol: I'm laughing at myself, not you!
Andy
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