Heated manifold

Claim 2

A heated manifold assembly for use in evaporating fuel particles during cold engine starts comprising an intake manifold having a carburetor riser bore therein, an induction passage within said intake manifold for receiving air-fuel mixture from the carburetor riser bore, transverse runners in said manifold for directing air-fuel mixture from the induction passageway to intake valves of the engine, means including a box having openings for collecting liquid fuel droplets from said riser bore, a heat transfer plate located in said box below the intake riser bores in the floor of the intake manifold, means for heating the heat transfer plate with exhaust flow for raising the temperature thereof upon cold engine start, valve means located in said induction passage between said riser bore and said box openings for diverting intake air-fuel mixture into said box and against said heated plate during cold engine start, said valve means including means responsive to engine temperatuRe for closing said box openings to reduce flow of air-fuel mixture across said heated plate and diverting said flow from the induction passage to the transverse runners when the engine reaches a predetermined temperature thereby to prevent excessive heating of the air-fuel mixture passing from the carburetor to the intake valves of the engine when it is heated to a predetermined temperature level.

Claim 3

A heated manifold assembly for use in evaporating fuel particles during cold engine starts comprising an intake manifold having a carburetor riser bore therein, an induction passage within said intake manifold for receiving air-fuel mixture from the carburetor riser bore, transverse runners in said manifold for directing air-fuel mixture from the induction passageway to intake valves of the engine, means including a box having openings for collecting liquid fuel droplets from said riser bore, a heat transfer plate located in said box below the intake riser bores in the floor of the intake manifold, means for heating the heat transfer plate with exhaust flow for raising the temperature thereof upon cold engine start, valve means located in said induction passage between said riser bore and said box openings for diverting intake air-fuel mixture into said box and against said heated plate during cold engine start, said valve means including means responsive to engine temperatuRe for closing said box openings to reduce flow of air-fuel mixture across said heated plate and diverting said flow from the induction passage to the transverse runners when the engine reaches a predetermined temperature thereby to prevent excessive heating of the air-fuel mixture passing from the carburetor to the intake valves of the engine when it is heated to a predetermined temperature level.

Claim 4

A heated manifold assembly for use in evaporating fuel particles during cold engine starts comprising an intake manifold having a carburetor riser bore therein, an induction passage within said intake manifold for receiving air-fuel mixture from the carburetor riser bore, transverse runners in said manifold for directing air-fuel mixture from the induction passageway to intake valves of the engine, means including a box having openings for collecting liquid fuel droplets from said riser bore, a heat transfer plate located in said box below the intake riser bores in the floor of the intake manifold, means for heating the heat transfer plate with exhaust flow for raising the temperature thereof upon cold engine start, valve means located in said induction passage between said riser bore and said box openings for diverting intake air-fuel mixture into said box and against said heated plate during cold engine start, said valve means including means responsive to engine temperatuRe for closing said box openings to reduce flow of air-fuel mixture across said heated plate and diverting said flow from the induction passage to the transverse runners when the engine reaches a predetermined temperature thereby to prevent excessive heating of the air-fuel mixture passing from the carburetor to the intake valves of the engine when it is heated to a predetermined temperature level.

Claim 5

A heated manifold assembly for use in evaporating fuel particles supplied from a carburetor to an engine during cold engine starts comprising an intake manifold having carburetor riser bores therein for receiving an air-fuel mixture from a carburetor, an induction passage in said intake manifold in communication with said riser bores and including a floor located immediately below said riser bores, transverse runners for directing air-fuel mixture from said induction passage to the intake valves of the engine, an opening in said floor, an enclosure supported in said floor and including a base portion thereon and a cover portion thereon forming a fuel evaporation chamber, means surrounding said base portion of said box for directing exhaust flow in heat transfer relationship with said box to heat the interior of said evaporation chamber, said cover including an opening therein for receiving fuel droplets from the riser bore during cold engine starts, valve means on said cover for diverting downward flow through the riser bores into the evaporation chamber through said opening so as to prevent flow of fuel droplets into the transverse bores during cold engine start, said fuel droplets being heated within the evaporation chamber to be evaporated for return flow through said cover opening and the transverse runners into the engine cylinders, said valve means being responsive to engine temperature to control flow through said cover opening to prevent excess heating of the air-fuel mixture as it pases through said induction passage once the engine has reached a predetermined temperature.

Claim 6

A heated manifold assembly for use in evaporating fuel particles supplied from a carburetor to an engine during cold engine starts comprising an intake manifold having carburetor riser bores therein for receiving an air-fuel mixture from a carburetor, an induction passage in said intake manifold in communication with said riser bores and including a floor located immediately below said riser bores, transverse runners for directing air-fuel mixture from said induction passage to the intake valves of the engine, an opening in said floor, an enclosure supported in said floor and including a base portion thereon and a cover portion thereon forming a fuel evaporation chamber, means surrounding said base portion of said box for directing exhaust flow in heat transfer relationship with said box to heat the interior of said evaporation chamber, said cover including an opening therein for receiving fuel droplets from the riser bore during cold engine starts, valve means on said cover for diverting downward flow through the riser bores into the evaporation chamber through said opening so as to prevent flow of fuel droplets into the transverse bores during cold engine start, said fuel droplets being heated within the evaporation chamber to be evaporated for return flow through said cover opening and the transverse runners into the engine cylinders, said valve means being responsive to engine temperature to control flow through said cover opening to prevent excess heating of the air-fuel mixture as it pases through said induction passage once the engine has reached a predetermined temperature.

Claim 7

A heated manifold assembly for use in evaporating fuel particles during cold engine starts comprising an intake manifold having carburetor riser bores therein and an induction passage for receiving air-fuel mixture from a carburetor, transverse runners in communication with said induction passage for directing the air-fuel mixture from the carburetor to the intake valves of the engine, a heat transfer box located below said riser bores in the floor of the intake manifold defining a fuel evaporation chamber, means forming a crossover passageway in said manifold for directing exhaust from the engine in heat transfer relationship with said box to raise the temperature thereof on cold engine start, means forming a cover over said box including a central opening therein underlying said riser bores, said cover including a pair of outlet openings therein for directing evaporated fuel from said evaporation chamber into said transverse runners, bimetallic valve means supported on said cover having a first operative position when the engine is cold to direct air-fuel mixture from the riser bores through the central opening of said cover into said evaporation chamber, thence outwardly of said cover outlets into said transverse runners whereby fuel droplets in the air-fuel mixture during cold engine start are evaporated prior to passage to the transverse runners, said valve means being responsive to a predetermined increase in engine temperature to assume a second operative position to close said outlet openings and to open direct communication between said induction passage and said transverse runners for reducing heat transfer from said box to the air-fuel mixture thereby to prevent excessive temperature increases therein following engine warm-up.

Claim 8

A heated manifold assembly for use in evaporating fuel particles during cold engine starts comprising an intake manifold having carburetor riser bores therein and an induction passage for receiving air-fuel mixture from a carburetor, transverse runners in communication with said induction passage for directing the air-fuel mixture from the carburetor to the intake valves of the engine, a heat transfer box located below said riser bores in the floor of the intake manifold defining a fuel evaporation chamber, means forming a crossover passageway in said manifold for directing exhaust from the engine in heat transfer relationship with said box to raise the temperature thereof on cold engine start, means forming a cover over said box including a central opening therein underlying said riser bores, said cover including a pair of outlet openings therein for directing evaporated fuel from said evaporation chamber into said transverse runners, bimetallic valve means supported on said cover having a first operative position when the engine is cold to direct air-fuel mixture from the riser bores through the central opening of said cover into said evaporation chamber, thence outwardly of said cover outlets into said transverse runners whereby fuel droplets in the air-fuel mixture during cold engine start are evaporated prior to passage to the transverse runners, said valve means being responsive to a predetermined increase in engine temperature to assume a second operative position to close said outlet openings and to open direct communication between said induction passage and said transverse runners for reducing heat transfer from said box to the air-fuel mixture thereby to prevent excessive temperature increases therein following engine warm-up.