Triton firing order
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From: Windsor,Ontario,Canada
Triton firing order
There is something that I cannot get my head around. The triton crank rod journals are spaced 90° apart and 2 rods share the same journal. Rods 1 and 5 share the first journal, 2 and 6 share the second, 3 and 7 share the third and finally 4 and 8 share the fourth. The firing order is 1-3-7-2-6-5-4-8. A v8 engine fires every ¼ turn of the crank or 90° of revolution. 8 cylinders times 90° equals 720° or two revolutions. So if we follow the firing order #1 fires at 0° then #3 at 90° then #7 at 180°. But wait #3 and #7 share the same rod journal. How can #7 fire only 90° after #3. The same thing happens with #2 and #6 and #4 and #8. Opposing cylinders must fire 360° apart if they share the same journal. 
Regards
Jean Marc Chartier
Regards
Jean Marc Chartier
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Joined: Apr 2008
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From: central Ontario
ok, finish the thought now.
When #3 fires, where is the journal carrying #3 and #7 rods pointing? So when #7 fires, where is the journal pointing? How many degrees are the two banks apart? Hmmm, so many questions...
When #3 fires, where is the journal carrying #3 and #7 rods pointing? So when #7 fires, where is the journal pointing? How many degrees are the two banks apart? Hmmm, so many questions...
I was visualizing an inline engine. Because the banks are 90° apart..........
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Joined: Aug 2006
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From: Summerville, SC
dont the two banks come together at a 90?
a 4 stroke engine means, 3 is firing, 7 is in intake stroke?
its not like an opposite bank firing? to explain (since i dont know the correct terminology), while 1 and 4 are in ignition so are 6 and 7. then next stroke 2 and 3 fire along with 5 and 8?
im trying to picture it myself.
a 4 stroke engine means, 3 is firing, 7 is in intake stroke?
its not like an opposite bank firing? to explain (since i dont know the correct terminology), while 1 and 4 are in ignition so are 6 and 7. then next stroke 2 and 3 fire along with 5 and 8?
im trying to picture it myself.
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From: Windsor,Ontario,Canada
You have to think of where the journal is in relation to TDC of the other bank.
Because the the banks are 90° apart TDC for #3 is ½ way up the cylinder for #7. Remember the engine fires every ¼ turn or 90° of rotation. So when the crank shaft rotates 90° because of the power stroke of #3 the journal has traveled 90° and is at TDC for #7. Remember the cylinders are not in line nor are they opposing.
On every journal you get two power strokes, one from each cylinder. First you get #1 firing. 90° later on the third journal you get two power strokes that are 90° apart. That occurs when #3 and #7 fire 90° apart. Then the second journal gets 2 power strokes 90° after that from #2 and #6. Turn 90° more and #5 fires on the first journal. 90° after that the 4th journal gets two shots when #4 and #8 fire.
Hope this helps.
Regards
Jean Marc Chartier
Because the the banks are 90° apart TDC for #3 is ½ way up the cylinder for #7. Remember the engine fires every ¼ turn or 90° of rotation. So when the crank shaft rotates 90° because of the power stroke of #3 the journal has traveled 90° and is at TDC for #7. Remember the cylinders are not in line nor are they opposing.
On every journal you get two power strokes, one from each cylinder. First you get #1 firing. 90° later on the third journal you get two power strokes that are 90° apart. That occurs when #3 and #7 fire 90° apart. Then the second journal gets 2 power strokes 90° after that from #2 and #6. Turn 90° more and #5 fires on the first journal. 90° after that the 4th journal gets two shots when #4 and #8 fire.
Hope this helps.
Regards
Jean Marc Chartier