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Gasket Cylinder Base (th) 1.5mm,

for Lambretta 125 LI/LIS/DL/GP
/150 LI/LIS/SX/DL/GP/175 TV
2°-3°
aluminium

Thick base and head gaskets / spacers are required for raised cylinders and crankshafts that have a longer stroke. When using a long stroke crankshaft, the half length 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 timeing changing more than the outlet timeing (= less blow down). This represents an optimisation for more torque at middling revs.

If you install a 60mm instead of a 57mm crankshaft on a MALOSSI 210cc, 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. On the 210cc, this is SIP's favourite touring combination, also in combination with long transmissions.

The raising of the POLINI 130cc in combination with a 54mm crankshaft is also popular, and rewareds with power, durability and winning positions. With a longer con-rod, the stroke does not change, but the cylinder has to be raised accordingly by the difference of the con-rod lengths. The base gaskets are available in 0.5mm - 10.0mm, the head gaskets are available from 0.5mm - 2.0mm. They are mostly made from aluminium.

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.

 

SIP-TIP: Do not forget the suitable long stroke crankshaft! With thick spacers, longer stud bolts are also required as well.


Customers also searched for this article with:  packing cylinder base, packing cylinderbase, spacer, aluminum, alluminium, ally, ally, aloy, alloy


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Engine, Gaskets & Exhaust

 
$7.64
7.64
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This item is in stock in sufficient quantity.
Art.No.
90778300

15g / piece
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icon scootermodels This product fits the following models
  LAMBRETTA
divider Producer/Model divider cc divider Type divider Engine divider Yr. of Const. divider Extra
LAMBRETTA DL/ GP 125 125 22/1 2T AC 1969-1971
LAMBRETTA DL/ GP 150 150 22/0 2T AC 1969-1971
LAMBRETTA GP 150 SIL 150 22/0 2T AC
LAMBRETTA LI 125 Serie 1 125 125LI 2T AC 1958-1959
LAMBRETTA LI 125 Serie 2 125 125LI 2T AC 1959-1961
LAMBRETTA LI 125 Serie 3 125 125LI3 2T AC 1961-1967
LAMBRETTA LI 125 Serie 4 125 125LI4 2T AC
LAMBRETTA LI 125 SERVETA 125 125LI 2T AC 1961-1965
LAMBRETTA LI 125 Special Serie 3/LiS 125 125LIS 2T AC 1965-1969
LAMBRETTA LI 150 Serie 1 150 150LI 2T AC 1958-1959
LAMBRETTA LI 150 Serie 2 150 150LI 2T AC 1959-1961
LAMBRETTA LI 150 Serie 3 150 150LI3 2T AC 1962-1967
LAMBRETTA LI 150 SERVETA 150 150LI 2T AC 1960-1965
LAMBRETTA LI 150 Special Serie 3/ LiS 150 150LIS 2T AC 1963-1966
LAMBRETTA SX 150 Serie 3/ X 150 Special 150 150SX 2T AC 1966-1969
LAMBRETTA TV 175 Serie 1 175 175TV 2T AC 1957-1958
LAMBRETTA TV 175 Serie 2/ SS 175 175TV 2T AC 1959-1961
LAMBRETTA TV 175 Serie 3 175 175TV3 2T AC 1962-1965
LAMBRETTA TV 175 SERVETA 175 175TV 2T AC 1963-1965

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