Racing crankshaft for rotary valve engines - longer intake time for more revs, more agility and more power.

Racing Crankshafts are a simple and effective tuning step for any rotary valve engine. A Racing Crankshaft enables higher revs - the Engine becomes more lively and agile. The result is better acceleration and a higher top speed. Compared to the original Crankshaft, a Racing Crankshaft has a significantly longer intake time, which increases the degree of filling. The crank webs are streamlined and polished, reducing turbulence and stalling. Depending on the version, a polished knife-edge connecting rod is inserted and the lower connecting rod bearing is designed as a silver bearing. All Crankshafts are supplied with upper connecting rod bearings.

• More power thanks to extended intake timing and higher filling level
• Flow-optimized, polished cheeks and Conrods reduce turbulence
• High stability thanks to high-quality production and speed-resistant design

The high-quality racing crankshafts from the Italian company MAZZUCCHELLI impress with their minimal manufacturing tolerances, low bearing play and excellent value for money. The design is engineered for high revs and offers high load-bearing capacity. A version that has been precision-balanced at a later stage is also available: in this version, the connecting rod is balanced at the 12 o’clock position, ensuring exceptionally smooth running.

Racing Crankshafts from TAMENI offer a very good interference fit - another important basis for high speed stability and a long service life.

PINASCO and JASIL Racing Crankshafts have streamlined, polished cheeks and a high-quality, forged and polished Conrod. Both shafts are supplied with silver bearings and have additional lubrication holes or lubrication channels/slots for optimum lubrication.

PINASCO also offers the Competizione Racing Crankshaft, a sporty variant with sharper timing, flow-optimized surface, tungsten balancing weights and innovative PTFE inlays that ensure higher compression at low engine speeds - ideal for potent touring or racing set-ups. PINASCO recommends using the Crankshaft in combination with a lighter Flywheel or an electronic Ignition such as PINASCO Flytech, SIP Performance, PARMAKIT, MALOSSI or POLINI.

The JASIL Super Racing Crankshafts are considered an insider tip: in addition to the advantages mentioned, they offer polished lip cheeks with an intake timing of 124°/6° after TDC.

Another highlight comes from POLINI: Flowed Racing Crankshafts with an intake timing of 141°/6° after TDC, precisely balanced and with flow-optimized (= lipped), polished intake cheeks.

Conclusion: Not only useful in combination with a tuning cylinder - a significant increase in performance can be achieved even with an original cylinder.