To be continued. (Time to expose bad production exhausts.)
Years and years ago, we were running a big bore bike on a Dyno (a customer brought to us)
He said it didn't have the power he expected and he had all the good stuff in the motor.
Turns out he had a bad piston, but that's not the point we are about to make.
With cylinder head temperature gauges, exhaust temperature gauges and fuel and air gauges we noticed it was lean and the gauges were reading nuclear hot.
After jetting up a bunch, some power was starting to be seen. But, the temp gauges were reading extremely hot. (Ignition timing was good)
Scratching our heads a bit, we started looking at the exhaust system. We were fooled a bit by the appearance of the exhaust. It was a double wall system with a very small inside diameter (for the bore size), and was hard to see from the outside.
Anyway, we changed the exhaust system to a larger (proven size) inside diameter system. The power jumped, cylinder head temp and exhaust temp dropped tremendously.
We suspect this same observation could happen with ill designed baffles.




Check this out

The photographs show examples of a few production exhaust merge collectors. We went in our salvage yards and cut up about 12 exhaust systems for you to see what some "BIG" name exhaust systems look like on the inside.
You might be a little surprised by the names and the unimpressive quality we are showing you. It might be a little impolite to mention names of some of these manufactures. But, oh well.
Muzzy, Kerker, Jardine, Yosimura copies, Vance & Hines and others are examples we have cut-up or probed to see the workmanship.
Many exhaust suppliers sell merge collectors that are more refined than the above mentioned manufactures. But, most of them do not offer the correct length we have mathematically calculated and tested.
 

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