Let's look at when the intake valve opens. In a high performance situation, it will typically open before top dead center and as in my case while the exhaust valve is still closing. The overlap period. I can see how the intake pressure would make it easier for the cam lobe to overcome spring pressure to open the intake. Still, I can't see cylinder pressure being so low (vacuum) that it would help suck the valve open before the cam lobe would act to open the valve.
I'm thinking if the pressure on the intake side is 78.5 lbs. and a vacuum pulse in the cylinder is enough to assist the intake pressure to overcome the force of the valve spring... Well, I just don't think that is a problem.
I'm thinking if the pressure on the intake side is 78.5 lbs. and a vacuum pulse in the cylinder is enough to assist the intake pressure to overcome the force of the valve spring... Well, I just don't think that is a problem.