One of the differences between the Coyote motor is that it has a firing order of 1-5-4-8-6-3-7-2. I wonder why they chose this firing order.
The Modular firing order is 1-3-7-2-6-5-4-8
The pushrod 5.0 HO (Roller Cam Fuel Injected) pushrod firing order is 1-3-7-2-6-5-4-8.
The pushrod 5.0 non HO (Flat Tappet Cam Carbureted) firing order is 1-5-4-2-6-3-7-8
Notice that the Coyote motor has the same firing order as the old non-HO 5.0 motor. They haven't changed order that the pistons reach TDC by altering the crank, they've just swapped the firing stroke in 4 of the cylinders through the use of cams and ignition.
I had an old 83 T-Top GT that I swapped a "roller motor" HO block into, and I remember having problems getting it to run right, because I overlooked that the roller motor had a different firing order than the non-HO motor, due to the cam. I just swapped the wires on the distributor and it ran fine.
Being that this firing order is the same as the non-HO 5.0 motors (and flathead motors), I wonder why they are touting it as one of the key features of this motor. Did they decide that the older firing order was better after all these years? I remember reading an article about the firing order and the Tri-Y headers that were designed to take advantage of it. It's nothing exotic.
All it takes to change the firing order on a pushrod motor is a different cam and changing the order of the spark plug wires on the distributor.
So, what's the advantage? Why does Ford like to swap around the firing order like this?
Homer
The Modular firing order is 1-3-7-2-6-5-4-8
The pushrod 5.0 HO (Roller Cam Fuel Injected) pushrod firing order is 1-3-7-2-6-5-4-8.
The pushrod 5.0 non HO (Flat Tappet Cam Carbureted) firing order is 1-5-4-2-6-3-7-8
Notice that the Coyote motor has the same firing order as the old non-HO 5.0 motor. They haven't changed order that the pistons reach TDC by altering the crank, they've just swapped the firing stroke in 4 of the cylinders through the use of cams and ignition.
I had an old 83 T-Top GT that I swapped a "roller motor" HO block into, and I remember having problems getting it to run right, because I overlooked that the roller motor had a different firing order than the non-HO motor, due to the cam. I just swapped the wires on the distributor and it ran fine.
Being that this firing order is the same as the non-HO 5.0 motors (and flathead motors), I wonder why they are touting it as one of the key features of this motor. Did they decide that the older firing order was better after all these years? I remember reading an article about the firing order and the Tri-Y headers that were designed to take advantage of it. It's nothing exotic.
All it takes to change the firing order on a pushrod motor is a different cam and changing the order of the spark plug wires on the distributor.
So, what's the advantage? Why does Ford like to swap around the firing order like this?
Homer
