Heres two pics i found so you can see what it looks like- this is the 26b used in the 787b.
Fully extended
http://www.scuderiaciriani.com/rx7/787B/26b_large.jpg
Closed
http://www.scuderiaciriani.com/rx7/787B/26b_1.jpg
Added: Found some info on it ill copy/paste
For induction, the engine employs peripheral ports for good volumetric efficiency, with a sliding throttle value used for low restriction in wide-open throttle (WOT) operation. Another feature is the telescopic intake manifold system (TIMS), the first of its kind over used on a racing engine.
TELESOPIC INTAKE MANIFOLD SYSTEM (TIMS)
It is a well known fact that the dynamic effect of intake airflow can be used to increase volumetric efficiency. The system adopted by Mazda employs telescopically-variable intake pipes, where the length of the pipes varies steplessly to match the engine speed, thus providing a dynamic effect over a wider engine speed range.
The telescopic intake manifold system, schematically shown in Fig. 9, consists of cylindrical pipes inside which air funnels can slide. The length of the four intake pipes is controlled by varying the position of the air funnels. The sliding air funnels are as thin-walled as possible, and there are no protrusions in the air passages so as to minimise chances in airflow.
The sliding air funnels for No.1 and No.2 rotors are interconnected via a linear ball bearing, as are those for rotors No.3 and No.4. The linear ball bearing is arranged such that it slides along a guide projecting from the stationary pipe side, thus positions the air funnels in their appropriate locations.
It is a well known fact that the dynamic effect of intake airflow can be used to increase volumetric efficiency. The system adopted by Mazda employs telescopically-variable intake pipes, where the length of the pipes varies steplessly to match the engine speed, thus providing a dynamic effect over a wider engine speed range.
The telescopic intake manifold system, schematically shown in Fig. 9, consists of cylindrical pipes inside which air funnels can slide. The length of the four intake pipes is controlled by varying the position of the air funnels. The sliding air funnels are as thin-walled as possible, and there are no protrusions in the air passages so as to minimise chances in airflow.
The sliding air funnels for No.1 and No.2 rotors are interconnected via a linear ball bearing, as are those for rotors No.3 and No.4. The linear ball bearing is arranged such that it slides along a guide projecting from the stationary pipe side, thus positions the air funnels in their appropriate locations.
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