Quote:
Originally Posted by RalliartRsX
Can the P12 head even be "machined" to stage 4?? As mentioned above, they have the water jackets right above the combustion chamber, so you are already limited in that sense and you cannot machine the P12 to the extent of the P11.
Also, as we have mentioned (hanz and I), lb for lb for P12 head does not perform much better than the P11, especially if you "upgrade" to P11 (int) valves. One of the reasons the P12 flowed more was due to the int valve stem diameter being .5mm thinner than the comparable P11 in addition to 30mm exh valves on the P12 vs the 29mm on the P11.
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Well the biggest benefit in our stage 4 is the aftermarket valve seats and custom valves, that's where you're gaining a lot of flow. As per machining it to the extent of the P11 that's not possible and even if you could, you wouldn't have the aftermarket to support it. We actually plan to push our stage 4 for the P11 further into the 350+ CFM range but that will come with R&D.
Another downfall to the P12 head is that you can't get our awesome 8 injector billet intake that utilizes a single rail to fit (spoiler we're making 1 piece billet lower intakes for ALL SR20 platforms now, pictures coming soon, also they will be able to be anodized as well, mic drop.)