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 minimal manufacturing tolerances, low bearing play and a very good price-performance ratio. This guarantees high speed stability and a long service life. In addition, a subsequently fine-balanced version is also available: In this version, the Conrod oscillates at 12 Clock, which ensures very 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.