Gasket cylinder base for 50/63cc cylinder (th) 0,8mm

for PIAGGIO CIAO/PX/SI/Bravo/Superbravo/Grillo/Boss/Boxer 50ccm 2T AC
46 mm
aluminium

for tuned engines Product description
Push it to the limit C Cylinder head and base spacers for long stroke crankshafts

Thick base and head gaskets / spacers are required for raised cylinders and crankshafts that have a longer stroke.
Available as cylinder base or head gasket
Different thicknesses (0.5mm / 0.8mm / 1.0mm)
Suitable for different diameters for racing cylinders
When using a long stroke crankshaft, the half lengths of the additional stroke has to be compensated for by a head and/or base gasket. With compensation by a base gasket, the outlet times are lengthened and the transfer times are also clearly longer. If the outlet is also lifted somewhat by milling, it is possible to optimise the engine for higher revs. Compensation with a head gasket lengthens the outlet and transfer times only slightly, with the transfer timing changing more than the outlet timing (= less blow down). This represents an optimisation for more torque at middling revs.
If you install a cylinder and crankshaft with 46mm instead of a usual 43mm crankshaft, the 3mm further stroke have to be compensated for a 1.5mm gasket. The following then applies: 1.5mm compensation, base: Wide revs range and high HP, but limited torque and boost to performance that is both late and only occurs suddenly. 1.5mm compensation, head: Extreme torque and risk of wheelies in the lower rev ranges but lower top speeds.

Our cylinderhead spacers are available in 0.5mm / 0.8mm / 1.0mm / 1.5mm, the base gaskets in 0.5mm / 0.8mm. There are head-spacers for 43mm racing cylinders with 63cc as well as spacers with 47.4mm for all cylinders with 73 C 74.6cc. The base-spacers with 46.0mm are suitable for all 50-63cc cylinders, the 50.0mm spacers for cylinders up to 73cc. Depending on the type of cylinder we require to work the base gaskets to match exactly with the boost ports.

Conclusion
: Long stroke crankshaft tuning with different spacer combinations is the performance increasing trend of recent years. This is where the wheat is separated from the chaff.

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