iansane
iansane SuperDork
12/20/24 1:47 p.m.

So I have car that is currently carbureted and I'm thinking about converting it to EFI. My first thought was just weld an injector bung in the stock intake because I have a spare. Well, it has two intake valves that are split into separate ports on the head and consequently the intake manifold is split too.

The topside of the intake runner would be an insanely convenient place to mount an injector bung but what are the drawbacks to firing the injector directly at the divider between the ports?

j_tso
j_tso SuperDork
12/20/24 1:55 p.m.

Are you going to retain the carburetor for the throttle body? A lot of EFI conversions have the injectors on or near the swapped throttle body.

iansane
iansane SuperDork
12/20/24 2:06 p.m.

I figured a TB pulled from another car of similar hp/displacement and an adapter or new flange welded to the intake. I wouldn't image a carb would do well as throttle body but I may be wrong.

Paul_VR6 (Forum Supporter)
Paul_VR6 (Forum Supporter) UltraDork
12/20/24 2:12 p.m.

Most injectors point right at the divider in the head. Likely a little further back. You could remove the divider in the manifold and port the head to have a sharp divider. There are some injectors that have a split pattern that may be able to deal with all this better but would need to know hp per cyl to make a recommendation. 

Paul_VR6 (Forum Supporter)
Paul_VR6 (Forum Supporter) UltraDork
12/20/24 2:12 p.m.

Most injectors point right at the divider in the head. Likely a little further back. You could remove the divider in the manifold and port the head to have a sharp divider. There are some injectors that have a split pattern that may be able to deal with all this better but would need to know hp per cyl to make a recommendation. 

alfadriver
alfadriver MegaDork
12/20/24 2:24 p.m.
Paul_VR6 (Forum Supporter) said:

Most injectors point right at the divider in the head. Likely a little further back. You could remove the divider in the manifold and port the head to have a sharp divider. There are some injectors that have a split pattern that may be able to deal with all this better but would need to know hp per cyl to make a recommendation. 

Such a good post, I'll make sure it's repeated a third time. 

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