Re: Looking for some DOHC horsepower

Posted by Piute on Apr 22, 2012; 5:24pm
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/Looking-for-some-DOHC-horsepower-tp3928486p3930322.html



   I've read most of his write up today this caught my thoughts;
Exhaust systems
When talking about exhausts here, we are speaking about 4-1 or 4-2-1 systems. Four individual exhausts may provide better performance, but at the expense of ground clearance and weight.

A 4-2-1 exhaust (which connects cyl. 1&4 and 2&3 first - this is the only way to do it right!) provides more mid-range and overall power, while a 4-1 exhaust has more peak power, both at the expense of peak power or all-around power, respectively.

Common knowledge seems to have it that the best header length (exhaust valve to collector box) is 70cm (27.5"). The secondary pipe on 4-2-1 systems should be 35cm (13.8").


      Guess thoughs nice loud pipe's going into the works on mine.