Brooking 850
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- Oct 3, 2011
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Here are acouple of pics of exhaust progress
Chris said:Hi Brooking
Nice work. Will they be coming back this way?
Chris
acotrel said:The outlet of the collector looks too small. I found years ago that if the cross-sectional area of the outlet is smaller than the total cross-sectional area of the header pipes it knocks too much off the top end of the rev range. Even so you will probably lose 1000 RPM off the top - it will probably drop the top from 8000 RPM to 7000 RPM. My header pipes have an ID to exactly match the stub and port in the head. I use a rev limit of 7000 RPM, which is probably still too much.
The exercise of cutting the tail pipe and collector back sequentially and fitting a short intermediate piece, progressively getting larger is worth doing - note the effect on torque and top end.
Best regards,
Al
hobot said:I for one is fascinated by Al 2-1 insights so will pow wow with him and online calculators to try to defeat Maney system for Peel. Peel will follow more alone Burt Munroe systems and just put up with the initial tire spin on easing out clutch to get going.