Quote:
Originally Posted by Jordo!
Based on what?
So long as the diameter is neither too wide nor too narrow (2.5" sounds about right, N/A for this engine), the bends are mandrel, the path is reasonablly straight, and the flanges seal well, why wouldn't make just about as much power? 
Seriously, how much R&D really goes into one of these CBE's? Does it go through more than 2 iterations and a few dyno runs? 
The only issue I see in the set up is the flange right at the x-join. A straighter path with a nice 2-1 Y merge collector before adding a flange might make a few whp difference, but so long as that flange doesn't leak or isn't a bottle neck, it should be fine. |
based on the bends, size of the mufflers, and they might be chambered too to keep to volume low all this will keep from getting max gains. R&D is for getting the right look and fit for ease of installment and for getting the right tone they want. Also testing with different resontaors and mufflers to get the desired results so to answer your eye rolling question yes it can take more than two iterations to get it the way they want. You will see alot of companies come out now that look like all the ones that came out first. Its easy to copy someone elses work. The ones that make the most gains have little bends and use straight thru mufflers with no bends but this will cause some drone.
But if its so easy build one yourself and market it for sale.