ESE's works engine tuner

[wobbly]

The RSW Vs the RSA is not even a close apples for apples comparison regarding the physical layout and many other detail changes - I have serious difficulties attributing
the RSA power increase to simply 25cc of CCR = going from 1.238 to 1.227 = only 8/10ths of 1 % change.
That % would be 0.4 Hp in 54, sure, absolutely worth doing, along with at least 5 other changes with far more significance.
But the RSA had its own downsides - the rear valves gear drive, and the front mounted bent pipe that also negatively affected the bikes weight balance and thus its handling.
Jan has said that given the opportunity to do it again, he would far rather have a valve on each side, not one on the back.

[TZ350]

.

The Dutch are at 20RWHP with their 50's. This is where we are at now. Not even the best for NZ but we are working on it.



This is someone else's but essentially the same motor as I am building. Hopefully with some direction from EngineMod2T we can do a bit better with our Rotary Valve Suzuki RG50 motors.

[Frits Overmars]

The Dutch are at 20RWHP with their 50's.

In 2025 each FreeTech50 bike in the first start row had about 24 rear wheel HP.

[wobbly]

After wasting near on 5 years of his and our time building completely dumb off the wall shit on UTube, Alex is now running a pretty much conventional 50cc 2T
and is achieving 27HP at the sprocket on petrol for his Bonneville LSR project.
During this time I wasted a bunch of time arguing with him about CCR, as he originally had a reed inlet system and by shear chance had close to a 1.3 CCR ratio but then decided to suddenly change to a rotary valve.
As usual that initially made about as much power as a chainsaw, until he finally listened and changed the case to around 1.2 CCR in part by adding a heap of clearance around the crank.
I havnt commented since about his engine, as Im afraid he will go wildly off on another tangent, and automatically start thinking " bigger is better ".

It will be a very interesting and worthwhile exercise to model your rotary 50cc TeeZee in EngMod, try the CCR in increments, then see what happens with the dyno real world tests.
In that case, I dont think absolute power numbers are the goal at all, but seeing the trend will be very informative.