Dual pipes for the F600 two cycle engines?

[reddevilsix]

QUESTION:
Is there an advantage to having two pipes for a 2 cylinder 2 cycle engine?

AI Overview
Yes, using two separate exhaust pipes (or independent expansion chambers) for a 2-cylinder, 2-cycle engine offers significant advantages, primarily focused on improved scavenging, reduced backpressure, and higher peak power. Each cylinder can be tuned independently to maximize performance, whereas a shared system can cause one cylinder to interfere with the other.

Key Advantages:
Optimal Scavenging: Two-stroke engines rely on pressure waves for proper scavenging (pushing out exhaust and bringing in fresh fuel). Separate pipes allow each cylinder’s exhaust pulse to be tuned, preventing the exhaust from one cylinder from interfering with the next.

Reduced Backpressure:
Two pipes provide a larger, freer exit path, allowing for higher, more consistent engine speeds, as each cylinder does not share one pipe, which could become a bottleneck.
Improved Efficiency/Power: By reducing backpressure and ensuring proper pressure waves, engines can breathe better, leading to improved, higher RPM horsepower and better cylinder filling.

Design Symmetry:
In many twin-cylinder configurations, having dedicated, independent, or properly balanced pipes allows for better engine balancing and performance symmetry.

Disadvantages:
Increased Weight & Complexity: Two exhaust systems are heavier and more complex to design and install than a single pipe.

Cost:
Two pipes/chambers are more expensive to manufacture.

Low-end Torque:
In some cases, a single, properly designed 2-into-1 system can produce better, consistent low-end torque compared to dual pipes.

For maximum high-RPM performance, separate pipes are generally superior, but they must be properly designed to work with the engine's timing.


WHAT DO YOU THINK:
It may be possible to put two expansion chambers inside of one larger pipe. The Y-pipe can be fixed with a divider in it to create two separate looking tubes. This can then be continued into the expansion chamber with two D-shaped chambers.
More performance? Illegal? Downside, AI thinks that it is possible that twin pipes may decrease the torque?

OK let the remarks fly.