Post by lowtechguy on Mar 23, 2007 16:20:08 GMT
We know that the conrods are weak at a certain point (120+bhp) however seeing as the hardest force on them is the exhaust stroke why don't we make modifications to aid this.
Example, longer duration overlap on the exhaust, the exhaust valve can be opened earlier potentially allowing a more powerful primary pulse and superior cylinder evacuation. This has the dual benefit of enhancing beneficial pressure waves inlet-exhaust and also reducing the pumping work the piston has to do on the ex stroke. Closing the ex later helps with scavenge by allowing incoming charge to purge the cylinder. Etc etc
Example, over porting on the exhaust ports? Over porting on the exhaust manifold creating a larger step than normal (we know it is good to have a step to the manifold for pulsing)
What do you think oldschool? Others?
Example, longer duration overlap on the exhaust, the exhaust valve can be opened earlier potentially allowing a more powerful primary pulse and superior cylinder evacuation. This has the dual benefit of enhancing beneficial pressure waves inlet-exhaust and also reducing the pumping work the piston has to do on the ex stroke. Closing the ex later helps with scavenge by allowing incoming charge to purge the cylinder. Etc etc
Example, over porting on the exhaust ports? Over porting on the exhaust manifold creating a larger step than normal (we know it is good to have a step to the manifold for pulsing)
What do you think oldschool? Others?
