Picked up a pile of MC22 CBR250rr spares off a bloke recently, which included a modified set of OEM headers with crossover pipes installed. Briefly did a little online research on them, but am happy to defer to others' knowledge or experience on the matter if anyone has something to offer. Has anyone used them and noted pre and post-modification performance changes for better or worse? What sort of performance characteristics or improvements might they offer (if any), judging by the size of the linking pipe and position along the length of the header?
cannot answer but bmw bikes have them standard. theory as i know it is to even out the gas flow. does it work- i defer to someone who knows.
The cross over pipes were fitted standard to the cbr250rr r models , the earlier l and n models didn't have them. Not sure what value they bring
Here is one answer. http://www.cycleworld.com/2015/06/26/ask-kevin-why-do-my-exhaust-headers-have-crossover-tubes Another view here. https://www.physicsforums.com/threads/4-cylinder-header-design.625212/
Thanks, I had come across one of those links before. Was aware of the general concept of gas scavenging. Didn't know that. The RR r example I had didn't have these though.
Indeed. The spares I picked up were from an OZ delivered RRr, so possibly the crossover pipes are original from factory, and not a modification as I was told. If that's the case, I would trust Honda R & D.
Might have something to do with the slightly increased torque the later models have over the older 45HP models.
Old Triumphs use balance pipes .... I bought a new set of headers for mine and it had the pipe whereas my originals didnt
A.C I would be interested in testing them on my racebike, need every skerrick of HP I can find Sent from my SM-G920I using Tapatalk
