INTAKE MANIFOLDS
Intake manifold conveys the air-fuel mixture to the engine by means of reed valve.
The total efficiency of an engine is calculated as the product of various partial efficiencies, such as:
- volumetric efficiency
- thermodynamic efficiency
- mechanical efficiency
Volumetric efficiency is the ratio between the quantity of fuel that can enter the combustion chamber and the displacement of the engine.
One of the main factors affecting volumetric efficiency is loss due to friction that the fluid encounters (air-fuel mix) when feeding from the air filter to the combustion chamber. Therefore, one of the components that greatly influences this loss is the intake manifold, since all of the mix has to travel through it with the minimum possible loss. For this reason, sudden increases in section and corners along the mix path must absolutely be avoided.
The intake manifold also acts as an accumulation tank for the fresh load, since the mix, travelling at a certain speed, requires time to stop when the reed valve closes. Therefore, mix collects in the manifold and exerts pressure against the reeds. For this reason, each manifold has a well-defined range of revolutions within which it provided maximum efficiency (tuned manifold).
In addition, the manifold supports the carburettor by connecting it to the engine casing or to the cylinder, damping vibrations between casing and carburettor and preventing emulsion of gas and air in the carburettor tank.
This apparently simple component therefore requires a great deal of study in order to take full advantage of all of its qualities.
Malossi engineers have achieved this to perfection. Malossi, with decades of experience in engine fuelling systems, has created a new line of manifolds in rubber and aluminium alloy for the new generation of scooters, and has tested and developed the line on roads and race tracks.
Malossi rubber manifolds feature a composite structure. Their construction begins with an aluminium insert that is encased in a special plastic material that is impervious to oils and fuels, guaranteeing increased rigidity at the point of attachment to the casing and greater flexibility of the manifold body.
Derbi - Minarelli engines : APRILIA - HONDA - PIAGGIO
| Code | Material | INTER-AXIS mm | Ø hole | Ø manifolds | Ø inlet | total lenght | carburettor applications | Note |
| 02 6639B | NBR | 61x40 | 6,5 | 30 | 35 | 27 | PHBH 26-30 VHST 26-30 | Not suitable for original air box filter |
Piaggio - Gilera 2T 50 engines : APRILIA - DERBI - GILERA - ITALJET - PIAGGIO
| Code | Material | INTER-AXIS mm | Ø hole | Ø manifolds | Ø inlet | total lenght | carburettor applications | Note |
| 02 7528B | NBR | 52 | 6,5 | 26 | 30 | 31,5 | PHBL | Not suitable for original air box filter |
| 02 8480B | NBR | 52 | 6,5 | 22 | 28 | 26 | PHVB 22 | For original air box filter |
| 02 5733B | NBR | 52 | 6,5 | 20,5 | 23 | 26 | ORIGINALS PHVA 12-17,5 PHBG 15-21 | Original spare Ø 20: for original air box filter |
Yamaha - MBK - Minarelli horizontal 2T 100 engines : APRILIA - BENELLI - ITALJET - MBK - YAMAHA
| Code | Material | Ø hole | Ø manifolds | Ø inlet | total lenght | carburettor applications | Note |
| 02 8399B | NBR | 6,7 | 22 | 28 | 24,5 | PHVB 22 | For original air box filter |
| 02 8481B | NBR | 6,7 | 21 | 23 | 24 | ORIGINALS PHVA 12-17,5 PHBG 15-21 | Original spare Ø 20: for original air box filter |
Yamaha - MBK - Minarelli vertical 2T 50 engines : APRILIA - ITALJET - MBK - YAMAHA
| Code | Material | INTER-AXIS mm | Ø hole | Ø manifolds | Ø inlet | total lenght | carburettor applications | Note |
| 02 8400B | NBR | 58x35 | 6,5 | 20,5 | 23 | 19 | ORIGINALS PHVA 12-17,5 PHBG 15-21 | Original spare Ø 20: for original air box filter |
| 02 8479B | NBR | 58x35 | 6,5 | 21 | 27 | 19 | PHVB 22 | Not suitable for original air box filter |
Products reserved exclusively for racing in specifically designed locations according to the provisions of the competent sporting authorities. We disclaim all liability for improper use
Vehicle compatibility (92 vehicles)
Aeon(1)
Aprilia(17)
- AREA 51 50 2T LC
- GULLIVER 50 2T
- GULLIVER 50 2T LC
- HABANA 50 2T
- RALLY 50 2T (MINARELLI)
- RALLY 50 2T LC (MINARELLI)
- SCARABEO 100 2T
- SCARABEO 50 2T (MINARELLI)
- SONIC 50 2T
- SONIC 50 2T LC
- SR 50 2T 1994→
- SR NETSCAPER 50 2T LC (MINARELLI)
- SR RACING 50 2T LC (MINARELLI)
- SR REPLICA 50 2T LC 2000→ (APRILIA)
- SR REPLICA 50 2T LC ←1999
- SR STEALTH 50 2T LC (MINARELLI)
- SR WWW 50 2T
Atala(1)
BSV(2)
Benelli(9)
- 491 GT 50 2T (MINARELLI)
- 491 SPORT 50 2T LC (MINARELLI)
- K2 100 2T
- K2 50 2T
- K2 50 2T LC
- NAKED 50 2T
- PEPE 50 2T
- PEPE LX 50 2T euro 2 (QJ1E40QMB-4)
- QuattronoveX 50 2T euro 2
Beta(6)
- ARK 50 2T
- ARK 50 2T LC
- CHRONO 50 2T
- EIKON 50 2T LC
- QUADRA 50 2T
- TEMPO 50 2T
CPI(7)
- ARAGON GP 50 2T
- HUSSAR 50 2T 2003→
- HUSSAR 50 2T ←2002 (50 C)
- OLIVER 50 2T 2003→
- OLIVER 50 2T ←2002 (50 C)
- POPCORN 50 2T 2003→
- POPCORN 50 2T ←2002 (50 C)
Explorer(1)
- CRACKER 50 2T 2003→ (GE 1E 400 MB)
Garelli(1)
- GSP 50 2T LC euro 2 (1PE40MB)
Hupper(1)
- MONTECARLO 30 50 2T (1E40QMB)
Italjet(2)
- DRAGSTER 50 2T LC
- MILLENNIUM 100 2T
MBK(14)
- BOOSTER 100 2T
- EV 50
- EVOLIS 50 2T
- FIZZ 50 2T
- FLIPPER 50 2T
- FORTE 50 2T
- HOT CHAMP 50 2T
- MACH G 50 2T
- MACH G 50 2T LC
- NITRO 100 2T
- NITRO 50 2T LC
- OVETTO 100 2T
- OVETTO 50 2T
- SORRISO 50 2T 1996→
Malaguti(12)
- CENTRO 50 2T
- CIAK 50 2T
- F10 50 2T
- F10 WAP 50 2T euro 2 (QJ*CMA03C*)
- F12 DIGIT KAT-PHANTOM 50 2T LC
- F12 DIGIT KAT-PHANTOM 50 2T LC euro 2
- F12 R ARIA 50 2T euro 2 (QJ*CMA02C*)
- F12 R LC 50 2T LC euro 2
- F12-PHANTOM 50 2T
- F12-PHANTOM 50 2T LC
- F15 FIREFOX 50 2T LC
- YESTERDAY 50 2T
Motron(2)
Yamaha(16)
- AEROX 100 2T
- AEROX 50 2T LC euro 0-1
- AEROX 50 2T LC euro 2
- AXIS 50 2T
- BREEZE 50 2T
- BW'S 100 2T
- JOG 50 2T
- JOG ER 50 2T
- JOG R 50 2T
- JOG Z 50 2T
- JOGRR 50 2T LC euro 2
- NEO'S 100 2T
- NEO'S 50 2T
- VINO 50 2T
- WHY 50 2T
- ZEST 50 2T
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