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- Lambretta
- Diaphragm Block - ITALKIT Doble Prisma - Honda CR125, NSR125; also fits Zirri, Falc, and Casa Lambretta cylinders
Double-prism diaphragm block with an enlarged effective diaphragm area for the Honda CR125, NSR125, and numerous Zirri, Falc, Casa Lambretta, and Polini applications.
The Italkit Doble Prisma Diaphragm Block increases the effective diaphragm area and improves air-fuel mixture flow through the intake tract. The 8-valve design is suitable for the Honda CR125 and NSR125, as well as various intake systems from Zirri, Falc, Casa Lambretta, and Polini.
By dividing the membrane into several smaller flaps, each individual flap needs to open less widely. This reduces the flap stroke and supports a quick response to changing pressure conditions in the crankcase. As a result, the engine responds more directly to the throttle and revs more freely across the entire RPM range.
Italkit Doble Prisma 8 valves Carbon valves 71 × 52 mm Polini 215.0469
A diaphragm block is located directly in the intake flow and thus influences the potential air-fuel mixture flow rate. Italkit distributes the required opening area across eight diaphragm blades. As a result, the individual blades respond quickly without having to open particularly wide.
Depending on the engine configuration, the Doble Prisma can improve throttle response, torque, and peak power compared to a conventional diaphragm block. With appropriately high-performance setups, power gains in the range of about 1 to 2 PS are possible.
The mounting hole pattern measures 71 × 52 mm. This allows the diaphragm block to be used, among other things, as an alternative to the Polini 6-valve diaphragm in the Polini intake manifold with manufacturer part number 215.0469.
The carbon diaphragm tongues are secured with Phillips-head screws. This allows worn or damaged tongues to be replaced individually without having to replace the entire diaphragm block.
| Manufacturer | Italkit |
|---|---|
| Series | Doble Prisma |
| Model | Diaphragm block |
| Diaphragm tongues | 8 pieces |
| Tongue Material | Carbon |
| Mounting hole pattern | 71 × 52 mm |
| Compatible with the Polini kit | Polini 215.0469 |
The Italkit Doble Prisma combines a large diaphragm area with eight fast-responding carbon reeds. This improves the potential air-fuel mixture flow rate and can enhance the responsiveness, torque, and power of a properly tuned engine.
