This RRD COMPETITION crankshaft is a long stroke and long connecting rod model, The only long connecting rod / long stroke electronic cone to be released for Peugeot 103 SPX, MVX, RCX and CLIP, The race represents the stroke of the piston, if the crankpin is offset 1.5mm this provides 3mm of additional stroke, as an example:
Ø46mm kit in 39.1mm stroke (original) = real 64.98cc
Ø46mm kit in 42.1mm RRD stroke (this crankshaft) = real 69.96cc
PARMAKIT Ø50mm kit in 39.1mm stroke (original) = 76.77cc real
PARMAKIT Ø50mm kit 42.1mm RRD stroke (this crankshaft) = real 82.66cc
This crankshaft therefore offers additional cubic centimeters of displacement, an enormous gain in torque, while bringing you closer to the so-called "square" engine with your large kits! This model is intended for large kits. The connecting rod has been lengthened by 9mm, so it is an 85mm connecting rod that we put on this crankshaft in order to improve the engine movement, to reduce the forcing on the piston, to avoid the problem of striking the PMB, ... This crankshaft is cut from the best special case-hardened steels and has undergone 3 treatments, case-hardening.
This very high quality crankshaft has been fully studied, designed and tested in our workshops. It is made of high-end materials in Europe. This crankshaft offers many advantages:
-Course increased to 42.1mm instead of 39.1mm, which offers an increase in displacement, the race also makes it possible to approach again the square race (46X42.1) and to have a better behavior engine in relation to a base race 39.1.
-Specific crankshaft balancing for the average piston weights of large kits, calculated on an average MALOSSI / POLINI / AIRSAL ...
- Ultra reinforced connecting rod placed on a 16mm diameter crank pin, ultra reinforced head and foot cage, improved head lubrication. Length pushed to 85mm (+ 9mm) to improve engine movement, have a PMB further away from the masses, less forcing on the piston, more free revs.
-On certain housings, it may be necessary to mill lightly or to pass a blow of abrasive roller type DREMEL for the passage of the small end. A distance of 0.5mm is required between the crankcase and the big end as a precaution.
-Price has been lowered for small, limited quantities, with very high quality of materials and workmanship!
-Cage of connecting rods in 12X16X16mm
The increase in stroke of 3mm as well as the increase in connecting rod + 9mm will require you to use a base shim of about 10mm), we sell the 1.0mm shims with a form of base type origin, to align to your motor transfers. Next, play with your base gaskets to obtain the desired compression ratio (also to be defined according to your diagrams).
The PMB piston goes down an additional 1.5mm, ideally you will align your lights to the PMB. Attention, do not use this crankshaft with a kit already prepared with very large diagrams on a normal race, the diagrams would end up being too high ... We recommend at most, diagrams of 196 / 133. Attention, check that the piston closes the exhaust port by at least 0.5mm at top dead center (TDC). On some kits, it is possible that the piston does not close the light. It will not adapt over a long run! Originally, the ignition of the electronic 103 is set at 0.9mm before TDC. You can put 1.1mm to 1.2mm ahead of this long stroke (on a normal stroke, you can go up to 1.3 to 1.4mm before TDC).
* With this crankshaft and the 10mm shim, plan a set of M7 X 125mm studs !
