Porting Rb25Det Cylinder Head

[reden]

Hey guys, I'm just curious as to the potential power gain you can achieve by porting the cylinder head of an rb25? Is it worth the money and time or would it be more beneficial to spend the money elsewhere?

[wolverine]

I'll take this one

Hookers and coke is the top response.

There are many other places you can make gains for less money. This is best left to the very serious and/or very knowledgeable.

[GTSBoy]

Really depends on what's at stake as to whether it's worth it.

The potential gains are huge. To do it properly (ie, pay someone who REALLY knows what they're doing) also costs a couple of grand.

[Badgaz]

well....if you think the head doesn't flow well enough for your power goal then sure...get it done properly by someone with a gas flow bench and who has done it before.

[GTRPSI]

Its not just about flowing for your power goal.

Its also about effecting drivability.

Bigger ports can hurt flow speed, hurt lower RPM power, in the hunt for high RPM power.

Where you take off can make a big difference, you dont just hack into it with a die grinder.

Walls are already thinish, take off too much from the wrong place can make you head worth its value in weight of aluminium when you break into a water jacket.

[R31Nismoid]

For anything under 350rwkw. Money is far better off being spend on diff, brakes, suspension etc.

[r33_racer]

The 25 head I built for our circuit car had only very minimal port work. All I did was clean up the ports which was pretty well just some blending into the throat below the valve seat. That head had the supertech kit through it, solid lifter conversion and 1mm oversize valves. That engine was making 680rwhp on a 3.4l stroker with a gtx35r.

From what I have seen, its really only needed if you are shooting for mega power; 800rwhp+.

As everyone else has said, money can be easily spent on other things first!