Well I finally got an Air Compressor today and decided to start porting my lower intake. First I tried to use the grinding stones, but they didnt work to well, they would just bounce around and I couldnt get them to bite in, so then I grabbed my sanding bit and went to work. I need to buy alot more of them from Summit Racing or somewhere else, but this is what I've done so far. Camera and light make it hard to see the actual diameter and such, when its done it should be easier to photograph. The runners will be substancially smoother ("rough" from casting) and also will flow alot better. On with the pics.











MrGone

ps. a side effect of smoothing out the runners is that it will prevent buildup in the future, the dirt wont beable to stick and cling to the sides of the runners nearly as easily.

 

 

You've removed quite a bit of material there. You should see excellent gains from that. Have you done anything with the upper manifold yet?

 

Thats awesome. You think a drill powered sander could do that?

 

Dont polish them mirror smooth. Just try to remove the casting roughness. You want to maintain a turbulent boundary layer in the air flow. The ensures proper fuel atomization.

 

When I did mine I stoped before it was too smoth just because of this reason.

 

mzmtg, the only thing about that is the Injectors are at the end of the runners. I wonder if I should leave the area around the injectors and somewhat before them rough? I'll probably put the injectors back on it and see their angle then decide.

96BLUMAX, a drill might not be able to spin fast enough, A dremel will. Actually a drill will work fine, it will just take longer. I ran mine at 80psi so it wouldnt spin as fast and also so I could have more control over the rpm range of the tool.

NightRider, Haven't messed with the upper yet. I was going to but then decided not to. I need to get more sanding drums.

Thanks for responding guys!
MrGone

 

You will see a lot better gains if you do the upper too.

 

What type of sanding drums did you use?

 

Does anybody have a good write up on this. I always wanted to do it. Could use some step by step though.

 

not tough...just buy spare ones and go to town...then do a write up...

 

Canuck, Im going to do the upper, I just need to buy the proper sanding rolls.

BluMax, 3/4" diameter by 1". I need more, infact I need an assortment of the drums and rolls. If you find a bunch of them, please LMK.

Max7, I'll create a write up when Im done. It's not hard, and I will cover technique, tips and tricks, etc.

nupe, pretty much,

 

you won't regret it

 

I bored out the Durangos throttle body yesterday and holy ****!!!!
It already had really good get up, but its even better now. Actually I'm worried if I do anything to my intake manifold and heads it will be too easy to spin.

MrGone

 

When i port matched the intake manifold to the pathfinder 70mm i polished it mirror smooth is that a no no there , and from grinding to much i left small dimples,is this bad also? Thanks

 

Krismax: You are fine on that portion. The rest of the intake manifold and lower intake plenum have enough casting imperfections to still simulate the turbelent air....

 

Thanks ,by the way how are your PR engine mounts.

 

I am starting to get confused. Why exactly is there such a big emphansis on turbulance? The injectors are at the very end of the lower intake plenum. I dont think that smooth vs. rough runners will affect the atomization of the air/fuel. With Carb and TBI setups its more important to have some turbulance, and some old BowTie racers I know used to modify spacers on their TBI engines. They would put remote control air plane propellers inside of the spacers, they said it made lots of extra power, but was kind of a ***** to machine to their exact specs.


hmmmm?
MrGone

 

about how much power would that yield?

 

Very little. Porting takes a lot of skill and contrary to popular belief, removing a lot of material is not a good thing.


Dave

 

Its also not so much the ammount of power, but when you get it. I modified the Throttle body on my Durango, and now it gets alot more air and requires less throttle to get up and go.

Mingo, I'm not sure on how much power, sorry.

Dave B, that is correct, I believe that it varies with each engine, each driver, and then they want or need their power.


I am thinking about what kind of effects one would see if they made swirl type grinds in the runners. hmmmm


MrGone

 

Too much porting can have a bad side effect, high end power will be increased, but low end may deminish somewhat. Its more apperant in the heads then the manifold however. People please give more into on this turbulence issue.

MrGone: Id personally leave the injector area alone. Just my .02

 

HitManSE, could you explain more on why you would leave the injector area alone?

-MrGone

 

Well its more of a case of preventing any mistakes. I havnt opened up the manifold so I dont know if it might interfere with the injector spray pattern in any way. If you are confident it wont cause any problems in any way then go4 it man, but your the one who can see into that area at this time, not me so dont let my .02 make any decisions for you if your 100% confident about it. GoodLuck man, we are awaiting the results

Ps: Post the results in a New thread when the time comes, not this 1. For some reason after 5pages are reached, the server is not sending post notifications that some1 has replied

 

Thanks for the reply, I appreciate your straight-forwardness.

I'm still looking into where I should buy some more sanding rolls and drums, just not very hard

Unfortunately since I no longer have a VE based car, I will most likly not be the person to post the results, but maybe Jeff92SE will...... If I beg him enough

I will be sure to create a new thread with the results, but what do you say about when I get more pics?

MrGone

 

Jeff, posting something yeah like he gives away whats been dont to his car. More pics the merrier, post em here all you want. Keep em' comin...

 

 

Any updates on this ??

 

Interesting..can't wait to see your finish product!! And of course your dyno sheet.Good work

 

Figures Shaun. You just cant leave well enough alone. Im gonna hafta come confiscate ur tools. I hope this yeilds some nice gains,If so U can come do my manifolds.

 

http://www.jlindustrial.com/


You need to buy steel shaping/porting bits to do the cutting. And 3M scotchbrite stars work well for cleaning up and getting intot he hard places. Cratex is also good for polishing. Check to see if you have a local J&L or WT tool .

 

Thanks for the Tip!!!!!

and looky, today and tommarrow you can get 25% off as long as you order 5 things or more.



Sorry to say but I havent done much more to it, right now I need to put out some small fires around here like finishing the Mustangs brakes and and rejetting the carb, and recurving the distributor (mechanical advance only), I also need to reroute my power steering lines and do a bunch of other small things that will help make the car streetable.


MrGone