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Only a few more steps separate us from hooking the engine into a test vehicle. As a test victim for our Polini engine, we use the well-known Silver Fern. When assembling the pole wheel, make sure that the groove hits the crescent wedge exactly. Then the flywheel nut is tightened to 65Nm. Don't forget the washer! The rear brake drum [...]
Only a few steps left untill we can dyno test our new engine. The engine will go into the Silver Fern and be tested for Rally going and daily commuting then. While fitting the flywheel care must be taken that the slot in the flywheel cone aligns with the woodruf key. Afterwards the flywheel nut […]
Now it starts with measuring the timing and the final steps before the first test bench runs. With a 1mm cylinder base gasket, the degree disc tells us an overflow angle of 125 ° and an outlet angle of 172 °. Values with which you should definitely try a few times. We also try 3 different cylinder heads directly [...]
Today we found the time to have a look at the port timings of the Polini kit. With a 1mm base gasket one look at the degree disc shows us transfer port timings of 125° and exhaust timing of 172°. This results in a blow down timing of 23.5°. Figures that really worth to try […]
With the appearance of the new Polini Evolution cylinder, the well-known Polini gray cast iron cylinder has also received an upgrade and from now on has the addition “Racing” in the name. A really massive cylinder head with an enlarged cooling surface, CNC machined combustion chamber and a copper gasket. Due to the greatly increased material thickness and the use of a head gasket as in the Evolution [...]
With appearance of the Polini Evolution cylinder kits at the scene, the cast iron barrels got updated as well. From then on the Polini cast iron barrel is labeled as Polini 133cc Racing. The most innovative feature is the new Polini 133 Racing cylinder head. A massive head with enlarged cooling fin area, CNC machined […]
The carburetor and intake area are prepared. Now we can fill the engine with the parts we still need. The 4 speed levels are built in in the form of a Px200 gearbox. Shift cross and gear wheels are mounted accordingly. The switch cross should be inserted with a little screw lock. Gear wheels, circlips and shoulder rings can then be draped to create a pretty overall picture. The game […]
Carb and rotary valve inlet are prepared and ready! Now the bare casings can be filled up with all the internals that make a good engine. For the gear box we opted for a complete P200 gearbox with layshaft, pre-assembled and in Original Equipment Manufacturer quality. Not a good idea to cut corners here. Because […]
We also take a closer look at the Polini intake trumpet and the Dellorto SI 26. Why do you even need this funnel? In the end, it simply helps the carburetor to suck in more air and to ensure a better filling with fresh gases. More ignitable fresh gases in the cylinder ensure more available power. A larger volume of air must of course [...]
Today we took a closer look at the Air intake filter / bellmouth from Polini as well as for the Dellorto SI 26 carb. And we will answer the question what the glory hole on top of the carb is good for? In the end it has a good effect on the working of the […]
With the arrival of the Polini 210, a dream has come true for many scooter riders. Proven Polini torque in an aluminum dress from the lowest revs with little effort. On the first "test engine" with 57mm stroke, this assumption was consistently confirmed. Polini has recently been offering other interesting toys to increase performance and, above all, to increase driving fun. Next to […]
Lots of scooterists out there and in here Scooter Center to, dreamt about a Polini 207 kit made of alloy with the hard wearing Nicasil plating. This dream already came true! We had one of the first kits fitted to a 10 hp standard P-range engine on our P4 dyno. The bullet proof Polini layout […]
Polini's plan to bring the well-known 210cc aluminum cylinder for the PX to the market in a long-stroke version (we reported) is finally taking shape. The new cylinder, the layout of which is presumably the familiar 210ccm cylinder (but with a longer raceway), is fitted with a special cylinder head [...]
Polinis project to launch the well known 210cc aluminum cylinder for the PX as a long-stroke version (as reported), is finally in the last steps. The new cylinder, which is presumably similar to the existing 210cc cylinder (but with a long aluminum bore), will be available with a special cylinder head to fit the stroke […]
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 PX200 motor serves as the basis, the rotary valve in the housing has been subtly expanded for more inlet angles before TDC. An original Piaggio PX200 shaft that has not been machined is used as the crankshaft. The new […]
Today we had a real beauty on our Dyno. A Vespa Rally 200. The aim of this project was to get a tractor torque engine for daily driving. Base was a Vespa PX200 engine, the rotary valve in the housing has been expanded for more discreet inlet angle before TDC. Crankshaft is a genuine PX200 […]
The ESC season is just around the corner and with it the preparations. This year we will see new engines and vehicles on the racetracks in Germany, France, Austria and Hungary. A typical K1 engine has appeared on our test bench and is checked for its performance and functionality. According to the ESC rules, [...]
The European Scooter Challenge (ESC) is just about to start. New engines and new scooters will be seen across the race tracks in Germany, France, Austria and Hungary. We just had a typical K1 engine on our test rig recently which we tested for its performance and functioning. According to the ESC rules, the stroke […]
“Last minute” Dennis put his Polini Evolution on the P4 with us. The key data of the engine: Carburetor PWK38 Crankshaft BGM 54mm Ignition Vespatronic The Falc exhaust pushes the usable band backwards. The slightly higher peak power of the Falc is offset by the lower speed level and the resulting higher torque of the Big Bertha. [...]
Today Jonas was our guest on our dynamometer. With a Polini 133 in the gray cast iron version, the young man has already achieved a very impressive 28,3 hp with our test fire magic exhaust. In addition to the gray cast iron Polini, which was more than neatly processed by Jonas, a Polini membrane and a 35 mm Keihin PWK carburetor help the engine [...]
