Posted by David G on December 26, 2013 at 11:53:11 from (98.195.55.212):
Modern car engine heads are designed so that the fuel injector can squirt directly at the intake valve.
A typical four cylinder tractor will share intake ports (Siamese) between two cylinders. This makes it difficult to ensure that the fuel is delivered to a specific cylinder. The problem is worse on injection, but does exist somewhat on carburated engines also.
Moving the injectors up close to the head will increase torque by providing fuel quicker upon change in throttle plate. There is a starvation in the cylinders when the throttle plate opens until the additional fuel can get to the cylinder. It will also decrease the warmup fuel required that would condense in the cold manifold.
There may be times when the adjacent cylinders have both intake valves open. I need to make sure and inject at the exact time when I can insure the correct amount of fuel goes to the correct cylinder.
I need to profile my CAM to find out these positions. Has anyone profiled their CAMS?
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