Guest Will Posted June 29, 2002 Share Posted June 29, 2002 I guess I need to come at this from another direction. I asked about header equations in this thread: http://www.hybridz.org/ubb/ultimatebb.php?ubb=get_topic;f=1;t=002357 But I've decided that I'll just derive my own equations. However, I need to know the exact effect I'm calculating. An old book I read on the topic said that when the exhaust valve opens a high pressure pulse travels down the primary, reflects off the change in cross sectional area going into the collector as a low presssure pulse and travels back up the primary toward the exhaust valve. At the tuning RPM the low pressure pulse arrives as the exhaust valve is closing and helps scavenge the last bit of exhaust from the cylinder. However, I've read a passing reference in a magazine article to the concept of using the 2nd harmonic of the tube for the greatest benefit, but I don't understand how this would work. Also, I've never read a theoretical explanation covering ideal flow velocity, etc. for determining primary diameter and collector diameter and length. Any help? Grumpyvette's probably got 16 links in his library on this topic. Quote Link to comment Share on other sites More sharing options...
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