I am going to get my p-port running agina and have decided to convert it from carb to EFI and am in need of some opinions about intake manifold designs. Keep in mind that it will be turbocharged.



First one I thought that I would use no intake plenum by having a single throttle body on top of the intake runners, then the fuel injectors right below the throttle body.



The other one would have a plenum and would have the throttle body before the plenum, with the injectors on the runners from the plenum.



I am thinking that the one with the plenum will would be more efficient.



Any thoughts would be great.

this might help...



https://www.nopistons.com/forums/ind...howtopic=55666

lol, you turkey! https://www.nopistons.com/forums/pub...#>/biggrin.png





Mine wouldn't work too well with a turbo setup, wouldn't like the pressure.



I would go with a single throttle body, plenum and then runners, with the injectors in the runners. https://www.nopistons.com/forums/pub...IR#>/smile.png

Thats what I am thinking.



If I remember correctly, the shorter the runners, the more response I get out of it, but I loose my lowend torque? I need to dig up the info about the 787b's engine and all about the variable length intake manifold. All I know is that I do not want to have any curves in the runnners, I want them going straight out.

There's not very much room available for a straight runner.

With the way that my port was done, it angles up, so I do have a little extra room to play with. I really wish that they ran the ports straight so it would flow better.

you can pm kahren and ask to see the intake on his FC. maybe thatll give you an idea. dunno if he has any posted.

;ool in my P-port thtead

I'm doing something similar for a semi-peripheral port engine