 During the 2005 season the most evident gap consisted in the power output of the engine and this is why in 2006 most of the job has been focused on it.
In these articles we will illustrate part of the work done by CRP Technology in the development of the engine exploiting the rapid prototyping technology and the Windform materials.
Airbox 2005 performance’s analysis
The 2005 250cc engine set up is a 90° 2 cylinders, with reed valve and two 40mm carburettors.
Two air intakes on the side of the cowling bring fresh air to the two separated air boxes.
During the 2005 season, several tests have been made to study the configuration of the two separated air boxes but, due to the overall dimensions it hasn’t been possible to have 2 air boxes of the same dimensions. This would have brought to a similar functionality of the two cylinders.
2006 development
From the analysis of the tests done on the dyno and from the behaviour of the engine in the different conditions, static, dynamic and combined (accelerative with progressive load) there has been a certain difficulty of fuel supply. These problems were different from cylinder to cylinder.
In particular the lower cylinder’s carburettor is very critical because the venturi is very close to the side of the air box.
The carburettor has therefore been rotated respecting the limits of the fuel level. Realizing a new structural (it means it supports the carburettor) induction insulator in Windform XT it has been possible to improve the functionality of the cylinder nr. 2
A one-piece air box in Windform has been realized in order to exploit in the better way the space inside the frame with the front air intake under the lower triple clamp
This has permitted to reach a similar behaviour of the two cylinders, therefore making the set up of the engine easier.
The engine has immediately improved and the setting of the two carburettors was similar.
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MotoGP 250R (1.7 MB)
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