Originally posted by e30leigh
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the problem is with most peoples understanding of the laws of physics. One of the biggest is bigger is better which doesn't always work out in a transient system (not steady state flow)
A stock 885 flows enough for 260hp but the engine only makes 170 because of the way the rest of system (intake, exhaust, etc) functions. The more flow the more "HP Potential" but not always "more HP". So the fact the 885 flow more is because of the size then it is not usually that efficient unless of course it is a huge bottleneck in the first place. The smaller port of the 731 allows more freedom in shape altering by material removal (885 really needs material added which is harder) and they can be made to flow the same as a stock 885 with a smaller volume (i.e. average cross section) which means more velocity for the same flow. There are a few other reasons one might choosie a modified 731 over a stock 885 but i wont go into it now.
Note i am talking about a modified 731 not a stock one.........a stock 731 is only an upgrade to a stock 200
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