Ported Stock Intake - Pic Heavy

[01bluesnake]

Very nice, giving me motivation to pull mine off and do the same lol.

 

[01bluesnake]

One of the LSx guys dyno'd cars before and after having LS3 intakes ported. He found many of the popular port jobs actually lost hp...

And it can. It's all about air velocity and the air/fuel mix before entering through the intake valve, playing with those you can either increase or loose power. I cant see What the OP did as being a severe port job and causing that big in change for the worse. The ridges around the injector bung may actually help tumble the air getting a better mix in the fuel before entering the chamber, so that might not help and could possibly hurt. Only a dyno will tell though. It would be nice to see a dyno or just a TB opening cleaned up stock runner, then one stock TB and ported runner to see what the gains really are from touching those areas.

 

[Need4Speed12]

OK, guys heres what I think...the car runs good - but it ran good before. I really dont notice any substancial difference, the car basically feels the same to me. I know 5 or 10hp might not really be noticable in either direction but I dont think the car slowed down any...but I cant say it picked up either.

I will also say Ford did a good job naming the teeth "Whoosh Fingers" because the car does whistle at certain part throttle points and you can really hear the engine sucking noise a whole lot more. I mean my car is a daily driver and I dont think I'll be able to put up with it. You hear it with the windows down considerably and with the windows up also. Nothing at idle but just part throttle tip in situations anytime your accelerating normally.

I'd say this is a thumbs down mod for me and I wouldnt advise doing it. I have other plans for the car and will be installing a boss intake next week along with a bunch of other mods...this was basically a test, but I'm not gonna bother even going to the track or anything.

Well, thats my results...too bad they werent positive!

 

[BAKnBLK2010]

OK, guys heres what I think...the car runs good - but it ran good before. I really dont notice any substancial difference, the car basically feels the same to me. I know 5 or 10hp might not really be noticable in either direction but I dont think the car slowed down any...but I cant say it picked up either.

I will also say Ford did a good job naming the teeth "Whoosh Fingers" because the car does whistle at certain part throttle points and you can really hear the engine sucking noise a whole lot more. I mean my car is a daily driver and I dont think I'll be able to put up with it. You hear it with the windows down considerably and with the windows up also. Nothing at idle but just part throttle tip in situations anytime your accelerating normally.

I'd say this is a thumbs down mod for me and I wouldnt advise doing it. I have other plans for the car and will be installing a boss intake next week along with a bunch of other mods...this was basically a test, but I'm not gonna bother even going to the track or anything.

Well, thats my results...too bad they werent positive!

Thanks for being honest with your evaluation! You never know unless you try....

 

[claudermilk]

Thanks for being honest with your evaluation! You never know unless you try....

+1 Good information, and saves anyone else from trying it.

 

[Sky Render]

Thanks for being honest with your evaluation! You never know unless you try....

+2

This is good information, even though the results weren't what we were hoping for.

Sent from my toilet using Tapatalk.

 

[01bluesnake]

Without a dyno comparison this is not a complete test. So to say this is not a good thing can't be used, as you said you cant feel a loss or gain. To me, 5-10whp for an essentially a free mod is more than worth it if that's what it gains. I would really like to see a before and after dyno to call it a bust.

 

[CCS86]

And it can. It's all about air velocity and the air/fuel mix before entering through the intake valve, playing with those you can either increase or loose power. I cant see What the OP did as being a severe port job and causing that big in change for the worse. The ridges around the injector bung may actually help tumble the air getting a better mix in the fuel before entering the chamber, so that might not help and could possibly hurt. Only a dyno will tell though. It would be nice to see a dyno or just a TB opening cleaned up stock runner, then one stock TB and ported runner to see what the gains really are from touching those areas.

These casting flaws and abrupt port wall changes are not helping anything in a vehicle like this. Due to the intake port shape, the fuel injectors have nearly a straight shot through the intake valve. This is about as close to direct injection as is possible with port injection. When the intake charge flows past the intake valve, there is PLENTY of turbulence. Anything upstream tripping turbulent flow is only contributing to losses.

i honestly don't think what was done will make any difference at all.

and now that i take a second look at those runners, if you dont do something to smooth down all those areas that you put the dremel to, i would almost wager you could hurt power. look at how smooth the area was before (minus the one little casting line) and now look at how beat up that is from the porting. all i see there is a rough area that will impede, or rather, slow down the velocity of the incoming air.

There are two main types of losses in internal fluid flow: major and minor. Major losses are ironically less than minor losses almost all the time. Major losses have to do with the surface roughness of the wall, the length of the runner, flow velocity, etc. The "minor" losses come from geometric disturbances like pipe fittings, sharp transitions, protrusions, etc. These are more likely to be a significant source of loss. Think about an as-machined CNC port. The tooling marks left on the surface are taller than say 300 grit sanding marks, yet they flow very well because they minimize minor losses from abrupt shape changes.

 

[CCS86]

I'm in the process of porting a stock intake for myself and I see room for improvement for sure. Further back in the port there is a pretty serious misalignment of the intake halves, as well as flash from the bonding process and sharp edges.

 

[SoCal81]

CCS any pics of this?

 

[CCS86]

I'll definitely post some up. Right now the surface finish makes it hard for a picture to show the smoothness of the shape. I made a short video clip looking into the ports before / after. PM me if you want a link.

 

[01bluesnake]

I actually ported mine as well. I did some minor porting/polishing on the tb, and porting the stock intake tube. Will post pics when I get home.


**made a thread with my pics, didnt want to crowd this thread**

http://www.s197forum.com/forum/showthread.php?p=1483759#post1483759