3d modeled pistons for N/A p90 vs shave and flat top

[1vicissitude]

So I have been reading into custom piston for a bit now. Trying to asses the cost- to-benefit ratio of pursuing such a build, and then i just came across this. It's a mold kit for the combustion chamber that uses a 3d scanner to make a model of the piston.

 

http://www.practicalmachinist.com/vb/metalcutting-machining/racing-create-custom-pistons-243247/

 

 

 

Now I had been planning on using a p90 head skimmed the traditional 2mm, but this combustion chamber molding has caught my interest. Has anyone gone through the process of this?

 

Any of the wiser people on here have insight on the benefits of having a perfectly shaped piston head vs the typical flat top shaved head combo? Would creating pistons like this for an unshaved p90 have benefits? Higher detonation resistance? More efficient combustion? More power?

[roger280zx]

The benefits of quench are well documented.  I imagine the benefits of leaving the stock ish deck on the head would begin with just that.. not everyone wants to take 2mm off their deck, and continue from there.  I would speculate marginally better cooling and retention of rigidity but it is pure speculation.  1fastZ has done a lot of work on achieving quench with custom pistons.  His ITB 3.1 has ridiculous compression (13:1 iirc) and loves pump gas.  Dad had a 283 built in '74 with catalog bought forged domes that were finish machined for his chamber.  13.5:1 iron heads pump (100 octane) 8000 rpm- has nothing to do with a p90 shaved vs. unshaved but just to illustrate different ways to achieve quench.