MSefi.com read only forum (Jan.15,2018)

ok, bear with me while i explain what i want to do. I want to put EFI on my 70 cougar with a 351c, but i dont want it to be obvious that i have EFI but dont want TBI. So is it possable and reliable to mount the fuel injectors and rails underneath the manifold? i am going to use a valley pan to keep oil from being splashed up on the bottom of the intake. For my throttle body i would use one of the 4bbl throttle bodies that would mount like a carb. Ignition would be TFI but would be the external unit off of a 460 truck. i know i would have a few things to overcome but do you think that it would work? Fuel injector could be positioned at almost a straight shot to the intake port of the head instead of an angle from top. Thoughts?

I saw it done in "Street Machine" magazine in Australia. It was done in an old Falcon. They also mounted the altinator at the back of the engine and covered the balancer so you couldn't see any moving parts. it looked very cool. If I find the magazine I will try and scan the artical.

cheers

Daniel.

that would be awesome if you could find that article, would love to read it.

do you think that mounting the injectors under the intake would cause any power loss?

What would the downsides to doing that would there be other than the obvious having to remove the intake anytime you upgrade, repair or in anyway change your fuel system.

The good thing about the cleveland is that it has a dry intake so i can r&r it all day long and never have to worry about leaking coolant.

thanks.

I know you said you dont want TBI but have you seen this one?
It looks like a big old holley.
http://www.retrotekspeed.com/products/b ... -quad.html

I have seen that and it is well out of the price range i was wanting to spend, if im going to spend that kind of money, i will have a system i want even if its not hidden, and with that system im using someone else's engineering instead of my own. there is nothing wrong with that system though.

I think they will sell just the throttle body but its still not cheap. That would be the way to go on a streetrod type of thing where you wanted the carb look.

The 351c is like a 302 right? Im not sure how much room you are going to need to get the rail and stuff in there and what angle the injector is going to end up. When they are on top they sort of aim into the port on the head which is more or less pointing to the valve. If you are underneath I dont know that you will be able to get them pointed in the right direction without a lot of work and maybe making bumps up into the runners if you are trying to get them close to the ends. I wonder if you get a single plane intake that kind of stands up a bit if you could line up the injectors sort of down the middle pointing straight out each direction? Maybe even on a single rail?

well a 351 Cleveland is kinda like a 302 in the respect that it shares the same motor mounts and bell housing pattern, but internally its almost a completely different animal than the 302, its more like a 351w than anything, but even still that is a stretch. I would be using a single plain intake so angle wouldn't be a problem because the intake is quite a bit taller than a dual plane, so injector angle could be angled just as good if not almost better than if the injector was on top of the intake because the injector could be laid almost perpendicular with the runner. Would i have any problems with putting them under the manifold like from heat or fuel vapors? What could possably effect the operation or reliability to doing it this?

Most modern cars the injectors are pretty well buried under covers or even the top half of the intake so they already must be running fairly hot. Being sealed in the valley area may be warmer. If you dont have any exhaust crossover in the intake that would help. Could you open up some of the area(s) between the runners to get some possible air flow? Or would that somewhat defeat the look you are going for?

I thought one of the 351's was a close relative to the 302. I dont know much about the ford V8's only a bit about the inlines.

Have you seen or considered one of these:

http://www.straightline-perf.com/catego ... t-219.html

Might be able to hide one of these under some of those large-diameter air cleaners of the early 70s.

The bigblock Mopar (which I am more familiar with) is a 'bridge-style' intake like the Cleveland. I am pretty confident that it would be impossible to install rails and injectors underneath one of them and still get good angles into the intake.

However, if you could make a custom fuel rail that held all 8 injectors somehow, that might help. It might be physically impossible to install such an item with horizontally-opposed injectors, though.