porting stock lower intake

[1990LTD]

I've got an extra efi lower intake that I got together with the ho upper a while back...I'd like to learn the basics of porting and I'm not worried if I fuck this thing up since it's currently being used to keep my kick drum from moving.

Has anyone here done this before? What kind of gains does one get from a ported lower intake?

Can I fuck anything else in the motor up if I do what turns out to be a horrible job of porting it? I don't think so but it doesn't hurt to ask. As long as the flux capacitor is fine.

[Ghorneck]

Nah... go for it. Make it shiny and take out any ridges. I used to do this on my 5.0 Mustangs. Much better throttle response is what I found it does. No power increase, but snapper response.

[Crownvicman289]

Look at the front 2 holes, there's a ton to be gained from there. TMoss ports them and reports the usable RPM ceiling to be increased significantly. There's a good bit to it to really make the most of it. Or you could grab an Exploder intake from the local pull and pay.

[gadget73]

yeah, the outermost ports are the biggest problems, #5 in particular. The middle ones you don't really need to touch. The optimal goal is to have every port flow the same, so while you can get a lot more out of the middle, you'll never get as much at the ends so you end up with an intake that still does not flow evenly.

[1990LTD]

sounds like a plan. i'll need to spend a few bucks on dremel stuff but tool costs don't count we don't have a yard where you can pull parts yourself and i've never actually seen a 302 explorer, only 4.0s around here.


at the very least I'll have a lower intake that's cleaner than the one that's on my car. when it goes back on it'll have 19lb injectors and a new cam/lifters with it so i won't really be able to tell if the porting did a damn thing

is there a gasket set to match the intake runners to?

[87gtVIC]

Hmm. I have a spare set of upper and lowers HO stuff. Looking forward to seeing how you make out with this Josh as I may try it too!

[1990LTD]

I dunno when it will be done but I don't have a digital camera, so chances are good I'll only have "finished" pictures, haha

[Crownvicman289]

Here's the guy who does it professionally

http://tmossporting.0catch.com/

And here's his guide on porting your own lower.

http://eectuning.org/forums/viewtopi...572d7aef0dd4f7

[1990LTD]

thanks!

[87gtVIC]

Here's the guy who does it professionally

http://tmossporting.0catch.com/

And here's his guide on porting your own lower.

http://eectuning.org/forums/viewtopi...572d7aef0dd4f7

Way cool. Any guides for uppers?

[Crownvicman289]

That and more in the tech section, enjoy.

http://eectuning.org/forums/viewforu...666ca826716584

[gadget73]

The lower is by far a bigger problem than the upper is, so generally I think he doesn't suggest messing with it since its not much help.

[87gtVIC]

^Understood.
I guess I may try this out once as I have a spare lower hanging around. Port her up, paint her up, and probably just rebox it lol cuz my car runs fine...no need to swap until a complete HO upgrade comes around.

[1990LTD]

The worst part of the upper intake is the "straight" shot from the throttle body....there's not much to be done with it though. the 90 degree bend can't be good for anything, either.

[gadget73]

People have sliced those intakes in half to allow full porting, and then welded them back together, sometimes with shorter runners up top for whatever reason. Seems like a hell of a lot of work for a stock upper intake to me.