415HP from 318ci IS POSSABLE!!
I havent built a 318 in years because no one wants me to.
But you still didnt answer my question.. which was once again:
-Given the right tight quench
-Given a piston with very little valve reliefs (see pic)
-Given the cam must be large enough in both lift and duration to put out 500+ horsepower by your own admission, albeit in a confusing hodge podge of scenarios and fuel types...
What do you do about valve to piston clearance?
Because even my small hydraulic cam engines need those valve reliefs when the quench distance is properly set. I'll typically have .200" of piston to valve clearance on the intakes and that's with a valve relief that's .300 deep (apprx twice+ as deep as pictured) in the piston top and a .039 gasket. You're talking about running tighter than that by a bunch. A cam can mimic 12.5:1 in cylinder pressure in a street rpm (say under 5K). But it would require the intake valve to be closed earlier in relation to the piston position and having little overlap for those that might be interested in how that works. A small cam like that will not make 500+hp at higher rpms, nor will it make 500 pound feet plus torque down low. So how does it all fit together and get those numbers? I still can't see how the physics is working there. It's all too rosie smelling. My build starts with a piston that has performance reliefs. This would be why.
I havent built a 318 in years because no one wants me to.
But you still didnt answer my question.. which was once again:
-Given the right tight quench
-Given a piston with very little valve reliefs (see pic)
-Given the cam must be large enough in both lift and duration to put out 500+ horsepower by your own admission, albeit in a confusing hodge podge of scenarios and fuel types...
What do you do about valve to piston clearance?
Because even my small hydraulic cam engines need those valve reliefs when the quench distance is properly set. I'll typically have .200" of piston to valve clearance on the intakes and that's with a valve relief that's .300 deep (apprx twice+ as deep as pictured) in the piston top and a .039 gasket. You're talking about running tighter than that by a bunch. A cam can mimic 12.5:1 in cylinder pressure in a street rpm (say under 5K). But it would require the intake valve to be closed earlier in relation to the piston position and having little overlap for those that might be interested in how that works. A small cam like that will not make 500+hp at higher rpms, nor will it make 500 pound feet plus torque down low. So how does it all fit together and get those numbers? I still can't see how the physics is working there. It's all too rosie smelling. My build starts with a piston that has performance reliefs. This would be why.
