[PQ]

Originally Posted by SSE 4 2SS

Look at it in my case, if I have a rump rump cam, and lots of overlap, and a restrictive exhaust, then my boost is circulating around and coming out of the exhaust valve as boost enhancement, t there is a point of diminishing returns,.. What I create essentially is a high bypass turbo engine, great for jets, not so much for cars...they force feed themselves through velocity, we force feed through exhaust gases...if my exhaust gas and my boost become the same thing, and it works, then I would have created perpetual energy, which isn't happening...so, I loose power with small LSA, and lots of overlap,,, the trade off to large duration is higher lifts, which create other problems, li,e was mentioned earlier, the valve kissing the piston.... Not good...Tis a fine balancing act we are taking on... Which is why I have such a good and knowledgeable builder...

It's good you try and understand it all too. I try and do the same thing. Of course so far I have done all of my mods myself. But the cam I may let someone do it. Not sure yet.