On the test bench, Polini210, Polini velocity stacks, SI26
Today a very nice Rally 200 was presented on our test bench.
The project to get an everyday tractor engine was well met here.
A serves as the basis PX200 motor, the rotary valve in the housing has been subtly expanded for more inlet angles before TDC. An original Piaggio comes as the crankshaft PX200 shaft used that was not processed.
The new 210 Polini will have a SI26 carburetor with Polini velocity stacks ventilated.
By the Polini velocity stacks the available torque increases very clearly in the lower speed range. For a comparable engine with Malossi cylinder Without the Polini funnel, almost 4Nm are “missing” in the same speed range!
On the outlet side, the Alu-Polini is fed by a SIP Road Exhaust supports.
From idle speed, there is a lot of torque and power.
18PS at 6000rpm and 23Nm from 4500rpm speak a clear language.
With a long Primary translation the torque, which is practically in abundance, can be stretched and high speeds can be achieved at relatively low speeds.
Very nice device!
I have a question. On my px200 built in 1988 with original 12 HP I mounted a Polini 210 alu. On recommendation I installed a 125 main jet in the original carburetor. As recommended by Polini, I have expanded the overflowers a little. Furthermore, I also previously drove a BGM Big Box on the original engine, which is now also mounted on the Polini again. Now my realization: The original engine ran better with the BigBox than it does now with the Polini210. I tighten significantly better and the engine doesn't turn as fast as it did before. Why is that? Greetings Richard
Which cylinder head is installed on the engine? The Polini 210 requires its own cylinder head, which is adapted to the diameter of the bore and the geometry of the piston crown.
Please check the nozzles in the carburettor, the following should be installed here: auxiliary nozzle 55-160, air nozzle 160, mixing tube BE3, main nozzle 125-135. The size of the main jet is always individually dependent on the engine, hence the specification of the main jet over a wide range. The Polini requires less pre-ignition than the 12HP cylinder. Please check your ignition timing, this should be 18 ° -19 ° for the Polini.