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Power Strokes
6.4 Aftermarket
Exhaust Back Pressure
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[QUOTE="White_monster, post: 83301, member: 594"] K well after talking with multiple mechanics, engineers and failure analysts the consensus is exhaust back pressure doesn't directly cause a head gasket to fail. It can indirectly cause a failure but I'll get to that later. Cylinder pressure on our trucks is incredibly high, I'm talking thousands of psi and while cylinder pressure is high the exhaust valves are closed thus sealing the cylinder from any pressure coming in, which won't happen cause ebp is up to 80psi so that's not going to overcome thousands of psi in the cylinder. So this is why back pressure isn't going to directly cause the hg to fail. Now when the ebp gets high enough to push the valve open, similar to floating valves, the cylinder pressure escapes into the exhaust but again the pressure doesn't spike cause of the volume of the exhaust piping. With the valves are forced open by pressure the piston can hit the valves and damage can occur and the hg can possibly fail for any number of reasons. So to conclude, ebp is from the exhaust valve to the exhaust side of the turbo. Cylinder pressure is it's own thing and that's why we need studs cause adding boost and more fuel will increase the pressure in the cylinder to the point stock bolts can't hold the pressure and they stretch. Hope this clarifies things for everyone and if you want more info just search google and there's pages of info on these subjects. I'd be days typing it or trying to explain it. There are ppl way smarter than me that have figure this stuff out for ms to read and learn from. Good day [/QUOTE]
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