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Corvette
Corvette Performance
Project "WHPLASH"
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<blockquote data-quote="Riley P" data-source="post: 13022" data-attributes="member: 2"><p>Where is Manny to explain this? Since I am here, let me butcher it and Manny can clean it up later. </p><p></p><p>The lost Torque is due to valve overlap meaning that at times, the exhaust and intake valves are open at the same time. Not so good at low rpms as the cylinder is not sealed and some of the intake charge goes with the exhaust making less torque but at higher rpms, the open exhaust valve helps to actually suck the intake charge into the cylinder. Plus, When you keep the valves open longer to get more air in or let more air out, at some point they are going to be open at the same time. That is also why if you go to too radical of a cam it won't idle at the normal rpm so you have to raise it. Enough intake charge goes out of the exhaust that there is not enough fuel/air in there to keep it running. Lumpity, lump, lump. Love the lumpy idle.</p></blockquote><p></p>
[QUOTE="Riley P, post: 13022, member: 2"] Where is Manny to explain this? Since I am here, let me butcher it and Manny can clean it up later. The lost Torque is due to valve overlap meaning that at times, the exhaust and intake valves are open at the same time. Not so good at low rpms as the cylinder is not sealed and some of the intake charge goes with the exhaust making less torque but at higher rpms, the open exhaust valve helps to actually suck the intake charge into the cylinder. Plus, When you keep the valves open longer to get more air in or let more air out, at some point they are going to be open at the same time. That is also why if you go to too radical of a cam it won't idle at the normal rpm so you have to raise it. Enough intake charge goes out of the exhaust that there is not enough fuel/air in there to keep it running. Lumpity, lump, lump. Love the lumpy idle. [/QUOTE]
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Corvette
Corvette Performance
Project "WHPLASH"
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