Quote:
Originally Posted by camshaftgsxr
which makes it run smoother  |
Incorrect sir because you chose to ignore the next sentence that I wrote...
Quote:
Originally Posted by 406 Q-ship
The 4/7 swap does not make the engine smoother, that was done by racers to get rid of the 5 and 7 firing so close together. Does not work because then 4 and 2 are now sequential.
The LS is a 4-3/7-2 swap to make the engine run smother. LS firing order is 1-8-7-2-6-5-4-3. This is the one racers should do to get the cylinders to not fire sequential. If you renumber a Ford 351 (or all later Ford V8s) cylinders to the same way GM does it, you will see that the firing order is the same (so Ford got it right....ouch that hurts to say).
1-8-4-3-6-5-7-2 STD most V8's
1-8-7-3-6-5-4-2 Swaped 4 and 7
1-8-7-2-6-5-4-3 LS V8s
|
then 2 and 4 become sequential which just moves it to the right front corner rather than the left rear corner. So no balance improvement nor a performance gain and the has been tested. I have seen tests that say it works on a race engine and I have seen tests that say it does not work.
Quote:
Originally Posted by 54Caddy
Ford did not get it right, Ford does not use the same cylinder relation as chevy does as far as the left bank being 1 3 5 7 and right bank being 2 4 6 8. Ford is left bank 5 6 7 8 right bank 1 2 3 4. so if you draw a diagram with the two number for the firing order they will not match not even close. GM is totally different than the Ford block. So there is no relation at all between the two
|
Again incorrect, I said number the Ford like a GM engine and start from the GM number one and you will see it is exactly the same as the LS/LQ series. Ford in
red
1
5 2
1
3
6 4
2
5
7 6
3
7
8 8
4
1-8-7-2-6-5-4-3 LS/LQ Firing order
1-3-7-2-6-5-4-8 Ford 351 Firing order
Now if you start both engine on the same cylinder the Ford Firing order becomes
5-4-8-1-3-7-2-6 Oh looky it is the same sequence as the LS.
BTW that diagram does not give the whole issue, you must go throught the whole firing order not just half.