Multi-bore intake manifold with improved fuel distribution

Claim 2

For use with an internal combustion engine having parallel rows of cylinders, a multibore carburetor and an exhaust conduit: an intake manifold having a manifold chamber, a plurality of feed conduits for connecting the manifold chamber with the cylinders, one or more vertical secondary bores open at the bottom to the manifold chamber and open at the top for connection with the carburetor secondary bores, one or more primary bores open at the top for connection with the carburetor primary bores, each manifold primary bore being blocked from direct communication with the manifold chamber by a primary floor but being open to a manifold secondary bore, whereby intake fuel mixture from the carburetor is distributed consistently among the cylinders.

Claim 3

For use with an internal combustion engine having parallel rows of cylinders, a multibore carburetor and an exhaust conduit: an intake manifold having a manifold chamber, a plurality of feed conduits for connecting the manifold chamber with the cylinders, one or more secondary bores open at one end to the manifold chamber and at the other end for communication with the carburetor secondary bores, one or more primary bores open at one end for communication with the carburetor primary bores and at the other end to the manifold secondary bores, a manifold exhaust conduit connecting the engine exhaust conduit with each of the manifold primary bores, whereby exhaust gases and fuel mixture are mixed while flowing through parts of the manifold primary and secondary bores and are distributed consistently among the cylinders.

Claim 4

For use with an internal combustion engine having parallel rows of cylinders, a multibore carburetor and an exhaust conduit: an intake manifold having a manifold chamber, a plurality of feed conduits for connecting the manifold chamber with the cylinders, one or more secondary bores open at one end to the manifold chamber and at the other end for communication with the carburetor secondary bores, one or more primary bores open at one end for communication with the carburetor primary bores and at the other end to the manifold secondary bores, a manifold exhaust conduit connecting the engine exhaust conduit with each of the manifold primary bores, whereby exhaust gases and fuel mixture are mixed while flowing through parts of the manifold primary and secondary bores and are distributed consistently among the cylinders.

Claim 5

For use in an internal combustion engine having parallel rows of cylinders, a multibore carburetor and an exhaust conduit: an intake manifold having a manifold chamber, a plurality of feed conduits for connecting the manifold chamber with the cylinders, one or more secondary bores open at one end for communication with the carburetor secondary bores and at the other end to the manifold chamber, one or more primary bores oriented vertically in the manifold, the manifold primary bores being open at the top for communication with the carburetor primary bores, each manifold primary bore being blocked at the bottom from direct communication with the manifold chamber by a primary floor and open at the primary floor to a manifold secondary bore, each primary floor containing a floor exhaust conduit therethrough, the floor exhaust conduit being connectible to the engine exhaust conduit and adapted to circulate engine exhaust gases through each primary floor for the heating thereof, whereby liquid fuel droplets in a primary bore impinging on a primary floor can be vaporized and the fuel mixture consistently distributed among the cylinders.

Claim 6

For use in an internal combustion engine having parallel rows of cylinders, a multibore carburetor and an exhaust conduit: an intake manifold having a manifold chamber, a plurality of feed conduits for connecting the manifold chamber with the cylinders, one or more secondary bores open at one end for communication with the carburetor secondary bores and at the other end to the manifold chamber, one or more primary bores oriented vertically in the manifold, the manifold primary bores being open at the top for communication with the carburetor primary bores, each manifold primary bore being blocked at the bottom from direct communication with the manifold chamber by a primary floor and open at the primary floor to a manifold secondary bore, each primary floor containing a floor exhaust conduit therethrough, the floor exhaust conduit being connectible to the engine exhaust conduit and adapted to circulate engine exhaust gases through each primary floor for the heating thereof, whereby liquid fuel droplets in a primary bore impinging on a primary floor can be vaporized and the fuel mixture consistently distributed among the cylinders.

Claim 7

An intake manifold for use with an internal combustion engine having two parallel rows of cylinders, a multibore carburetor and an exhaust conduit, the intake manifold including: a manifold chamber, a plurality of feed conduits for connecting the manifold chamber with the cylinders, a carburetor mounting pad above the manifold chamber, a pair of secondary bores extending vertically between the carburetor mounting pad and the manifold chamber to connect the latter to tHe carburetor secondary bores, a pair of primary bores extending vertically downward from the carburetor mounting pad for communication with the carburetor primary bores, each of the manifold primary bores being open to a manifold secondary bore, a primary floor at the lower end of each manifold primary bore to prevent direct communication thereof with the manifold chamber, a first exhaust conduit extending through each primary floor and communicating with the engine exhaust conduit, whereby exhaust gases are brought into contact with the primary floors for the heating thereof and resultant vaporization of liquid fuel deposited thereon, a second exhaust conduit communicating between the engine exhaust conduit and the manifold primary bores for introduction of exhaust gases into the manifold primary bores, whereupon the exhaust gases mix with fuel mixture in the manifold primary and secondary bores before entering the manifold chamber.

Claim 8

An intake manifold for use with an internal combustion engine having two parallel rows of cylinders, a multibore carburetor and an exhaust conduit, the intake manifold including: a manifold chamber, a plurality of feed conduits for connecting the manifold chamber with the cylinders, a carburetor mounting pad above the manifold chamber, a pair of secondary bores extending vertically between the carburetor mounting pad and the manifold chamber to connect the latter to tHe carburetor secondary bores, a pair of primary bores extending vertically downward from the carburetor mounting pad for communication with the carburetor primary bores, each of the manifold primary bores being open to a manifold secondary bore, a primary floor at the lower end of each manifold primary bore to prevent direct communication thereof with the manifold chamber, a first exhaust conduit extending through each primary floor and communicating with the engine exhaust conduit, whereby exhaust gases are brought into contact with the primary floors for the heating thereof and resultant vaporization of liquid fuel deposited thereon, a second exhaust conduit communicating between the engine exhaust conduit and the manifold primary bores for introduction of exhaust gases into the manifold primary bores, whereupon the exhaust gases mix with fuel mixture in the manifold primary and secondary bores before entering the manifold chamber.