Info about Head porting

[L2THEJ]

what kind of gains are we loooking at atleast for my car 1998 accent 1.5 Sohc

[oldskewl]

great posting! I haven't heard that good an explanation to that technical a subject in a long time. The only thing I'd like to add.... is the valvejob/porting should be engine specific. If you want a hi compression 12k rpm screamer, you'll have one type, a nice 20% boosted tourer will have, lets say... "a more conservative job required." Also... besides the 3 or 5 angle valve job, a bit on hand lapping is good to. This matches the valves surface to the valveseats surface.

[Kenji]

anybody know how much power we gain with a head porting? like 25% more of power?

[alexander123]

With 25% you'll be in the teritory of a small turbo.
You can expect a 10% increase, if it's a good head job. (depends on your mods done)
I did a mild head job on a 1.6 alpha 2, and got around 6%.

[glasskev]

If I take my 98 Accent (1.5L Sohc) and have them port my engine as much as possible, how much HP increase am I looking at getting.

I want to do a Beta Swap but I dont want to loose my A/C, its the best thing on the planet

[matt1840]

to port polish and do a 3 angle valve job to my 1.6 dohc is $850.... not to shabby i spent well over $1500 on my chevyheads hahah

[scrood]

Originally posted by Shadohh
[body]
The intake port should be no smoother than 220 grit as maintaining some boundary layer turbulence is good for good bottom end. This turbulence makes the port virtually a little smaller at low flow velocities.


[/body]

The turbulence also keeps the fuel thats being squirted by the injectors, airborn and does'nt land on the smooth internal surfaces and turn into droplets-like rain on a window.

[2loud2k2xd]

very nice post. thinking bout head-up on 2k2xd betaII motor. head 284cams, bbtb, pp im. should get great gains from that. you said avg of 6% gains on head alone on a 1.6 liter, how bout 2.0 betaII

[psicoaccent]

Yeah, I have my head port, in my 1.5L SOHC, the principal increase is torque, with these mod, plus port intake manifold, 1.8L beta throttle body, CAI and free exhaust, gain around 5 hp and 8 lbs-ft torque (dyno tested).

[M.A.K.E.]

Originally posted by 2loud2k2xd
[body]
very nice post. thinking bout head-up on 2k2xd betaII motor. head 284cams, bbtb, pp im. should get great gains from that. you said avg of 6% gains on head alone on a 1.6 liter, how bout 2.0 betaII
[/body]

Where do you get those cams of 284 degrees!: