NBR tilted intake manifold Ø 21-23 L.24 for Yamaha - MBK - Minarelli horizontal 2T engines

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	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	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	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	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

 

 

 

Modellek:

• AEON MOTOR COBRA 50 2T (AT70)
• APRILIA SR 50 2T 1994->
• APRILIA AREA 51 50 2T LC
• APRILIA GULLIVER 50 2T LC
• APRILIA GULLIVER 50 2T
• APRILIA HABANA 50 2T
• APRILIA RALLY 50 2T (MINARELLI)
• APRILIA SR NETSCAPER 50 2T LC (MINARELLI)
• APRILIA RALLY 50 2T LC (MINARELLI)
• APRILIA SCARABEO 100 2T (Original spare Ø 20: for original air box filter)
• APRILIA SCARABEO 50 2T (MINARELLI)
• APRILIA SR RACING 50 2T LC (MINARELLI)
• APRILIA SONIC 50 2T
• APRILIA SONIC 50 2T LC
• APRILIA SR REPLICA 50 2T LC 2000-> (APRILIA)
• APRILIA SR REPLICA 50 2T LC <-1999
• APRILIA SR STEALTH 50 2T LC (MINARELLI)
• APRILIA SR WWW 50 2T
• ATALA CAROSELLO 50 2T
• BENELLI 491 SPORT 50 2T LC (MINARELLI)
• BETA ARK 50 2T
• BETA ARK 50 2T LC
• BETA CHRONO 50 2T
• BETA EIKON 50 2T LC
• BENELLI 491 GT 50 2T (MINARELLI)
• BENELLI K2 100 2T (Original spare Ø 20: for original air box filter)
• BENELLI K2 50 2T
• BENELLI K2 50 2T LC
• BENELLI NAKED 50 2T
• BENELLI PEPE 50 2T
• BENELLI PEPE LX 50 2T euro 2 (QJ1E40QMB-4)
• BETA QUADRA 50 2T
• BENELLI QuattronoveX 50 2T euro 2
• BETA TEMPO 50 2T
• BSV AX 50
• BSV GZ 50
• CPI ARAGON GP 50 2T
• CPI HUSSAR 50 2T <-2002 (50 C)
• CPI HUSSAR 50 2T 2003->
• CPI OLIVER 50 2T <-2002 (50 C)
• CPI OLIVER 50 2T 2003->
• CPI POPCORN 50 2T <-2002 (50 C)
• CPI POPCORN 50 2T 2003->
• EXPLORER CRACKER 50 2T 2003-> (GE 1E 400 MB)
• GARELLI GSP 50 2T LC euro 2 (1PE40MB)
• HUPPER MONTECARLO 30 50 2T (1E40QMB)
• ITALJET DRAGSTER 50 2T LC
• ITALJET MILLENNIUM 100 2T (Original spare Ø 20: for original air box filter)
• MALAGUTI F10 50 2T
• MALAGUTI F10 WAP 50 2T euro 2 (QJ*CMA03C*)
• MALAGUTI F12-PHANTOM 50 2T
• MALAGUTI CENTRO 50 2T
• MALAGUTI CIAK 50 2T
• MALAGUTI F15 FIREFOX 50 2T LC
• MALAGUTI F12 DIGIT KAT-PHANTOM 50 2T LC
• MALAGUTI F12 DIGIT KAT-PHANTOM 50 2T LC euro 2
• MALAGUTI F12-PHANTOM 50 2T LC
• MALAGUTI F12 R ARIA 50 2T euro 2 (QJ*CMA02C*)
• MALAGUTI F12 R LC 50 2T LC euro 2
• MALAGUTI YESTERDAY 50 2T
• MBK BOOSTER 100 2T (Original spare Ø 20: for original air box filter)
• MBK EVOLIS 50 2T
• MBK EV 50
• MBK FIZZ 50 2T
• MBK FLIPPER 50 2T
• MBK FORTE 50 2T
• MBK HOT CHAMP 50 2T
• MBK MACH G 50 2T
• MBK MACH G 50 2T LC
• MBK NITRO 100 2T (Original spare Ø 20: for original air box filter)
• MBK NITRO 50 2T LC
• MBK OVETTO 100 2T (Original spare Ø 20: for original air box filter)
• MBK OVETTO 50 2T
• MBK SORRISO 50 2T 1996->
• MOTRON SYNCRO 50
• MOTRON THUNDER'S 50
• YAMAHA AEROX 100 2T (Original spare Ø 20: for original air box filter)
• YAMAHA AEROX 50 2T LC euro 0-1
• YAMAHA AEROX 50 2T LC euro 2
• YAMAHA AXIS 50 2T
• YAMAHA BREEZE 50 2T
• YAMAHA BW'S 100 2T (Original spare Ø 20: for original air box filter)
• YAMAHA JOG ER 50 2T
• YAMAHA JOG 50 2T
• YAMAHA JOG R 50 2T
• YAMAHA JOGRR 50 2T LC euro 2
• YAMAHA JOG Z 50 2T
• YAMAHA NEO'S 100 2T (Original spare Ø 20: for original air box filter)
• YAMAHA NEO'S 50 2T
• YAMAHA VINO 50 2T
• YAMAHA WHY 50 2T
• YAMAHA ZEST 50 2T