I know this may be a dumb question but can the eaton 112 or 122 kits for the 99-06 silverados be ported like the lightning blowers can. I just ported my buddies 02 lightning blower and with a 6lber it pulls like a rapped ape. I am not sure if these units come already opened up like a ported lightning/cobra blower, similar to the stagmeier port. I have yet to hear or see anyone talk about it on the forums. thanks

cory


p.s. the pic is what i am talking about

 

Ooh just wait till BC gets his hands on this one

There is not much support here for porting. I think it's viewed as one of those snake-oil kind of things, like a turbonator or electric supercharger. I'll wait for BlownChevy to fill in the details, lol.

 

 

 

I guess some things are better off untouched here i see. Just asking a off topic question.

 

Its not that is is better left un-touched "here". It is better left UN TOUCHED period. Now that you have opened up the discharge side of the blower you have thrown the rotor timing off and made the blower LESS EFFICIENT.

Use the search button, there is a LONG thread about this from two or three years ago. PS, Steigmeir is a butcher.

 

So where do the gains come from that people report? It's pretty popular amongst the SVT peeps. I'm honestly asking here, as I've never given it much thought. It seems that if you enlarge the discharge area, it'll have the ability to move more air. I know that will affect efficiency, but is that what all the hype is? It makes the boost gauge move further?

It seems as though the geometry is designed probably through CFD, but back in the day it was through trial and error. Seems kind of taboo to me.

 

The gains are few and far between, Steigmeir claims that in order to get a gain you must "raise" the boost and "tune".....EATON spent MILLIONS of hours on the discharge side of the supercharger, there is more science there than most realize.

I tested back to back stock vs. ported blowers back in the day. The ported blower lost over 50 ft pounds of tq and 20 HP.

On a side note, he also believes that "stripping" the rotors promotes better efficiency.

 

here is a post from SVT. It shows the difference between the 6lber and ported vs. non-ported. Yes we did strip the rotors as well on his lightning.

http://www.svtperformance.com/forums...ort-video.html

 

You car read what ever you want into this. The porting of the blower housing and stripping of the rotors destroys the supercharger.