i am just wondering what kind of power people are seeing out of porting their head. i am buying on right now and when i get it it will be sent off to the machine shop. so i am just trying to figure out what to expect.

 

It won't really increase your power by itself. What it will do is allow your engine to flow more air, which will lower your psi without reducing your air flow. In effect, you'll be moving the same ammount of air with less pressure.

So your SC will work easier since it will be closer to it's peak efficency range, you'll have lower IAT2's, and you can tune more aggressively. Thats where you'll make your more power from. That, plus a couple of ponies freed up from parasitic loss to the supercharger (less pressure means less resistance means needs less force to turn).

Combine the head porting with a valve train that can handle 0.5" of lift (since you'll have the head off already, possibly pistons to cuz hey, engine is already cracked open), a custom cam with 0.5" of lift, a good free flowing exhaust, a 2.8" pulley, and some serious cooling mods and you'll make crazy power.

If you can increase your total flow by 20~25%, you'll only see ~10psi to ~12psi with the 2.8" pulley.

 

I'll let EVERYONE know what I ported head gives you when I fix my car. Right now its in no condition to be dyno'd. Worst case scenario it will be fixed before the end of the month.

 

this will be good to know because i want to do some work to the internals soon.

 

i will probably be putting in pistons but i don't know about going with cams. my buddy put cams in his and has had nothing but problems with tuning and everything in general. not saying that that will be the case with me but i just don't want to deal with it.

 

Don't do cams as of right yet. Right now there is no set of camshafts that will work well on the LSJ.

 

20-30whp

 

it will be good for some numbers, the less load you put on anything, that is engine operated the more h/p you will put to the ground.

 

Agreed! dont know about you 2.0 guys but I picked up 40 with my heads and cams and the same for torque

 

see i have seen so much more power come out of soing that to other vehicals. example: my boss has a 1940 chevy with a 350 and he ported his heads and gained 125 hp. now i am not expecting that but i thought that it would be about 50 or so. but i don't know. thats why i'm asking.

 

If you look at a V8 funny it makes 50 extra hp. Unfortunately for us it doesn't quite work like that. but it definately would be a very good mod and give you a good base for extracting alot more power.

 

Porting heads does so much more than free up HP due to the intake runners being smoothed. That's the first thing people think of when porting is mentioned and they get too caught up in the intake flow numbers.

The exhaust flow is just as important, if not more-so on an supercharged engine. The easier it is for the engine to rid the combustion chamber of exhaust gases, the more uncontaminated the intake charge is.

Plus, a common solution porting achieves is ridding the exhaust of places for carbon deposits to form. That's more of a long term benefit, but a benefit regardless.

Cleaning up and smoothing out the combustion chamber itself helps flow, reduce hot spots and promote good swirl.

Reducing hot spots is very beneficial in a supercharged engine that often sees A/F ratios on the rich side. It helps reduce spark knock and pre-ignition.

Promoting good swirl in the combustion chamber helps atomize the fuel and increase efficiency.

 

Good post. +Rep.

 

see i know all of that. that is why i figured that it would help out more than 20hp. i mean it doesn't matter if its 10hp or 100hp. i'm gonna do it just because of all the advantages of having it done. the more efficient that you make your motor the more power that it can potentially make. and thats what i am really looking for more than straight power.