v-4 crossflow powerhead

[baiwan]

I was looking for overhaul kits when I came across forged pistons and cast pistons and wonder if there is a significant advantage of using forged pistons?

 

[tashasdaddy]

Re: v-4 crossflow powerhead

i think terminology, marketing. both are hot metal poured into a mold.

 

[Faztbullet]

Re: v-4 crossflow powerhead

OEM and a lot of aftermarket pistons are cast, the Wiseco are forged pistons and expand faster than a cast piston. Pistons are manufactured in one of two ways. The cast piston is made of molten aluminum. The alloy is flowed into a mold having the shape of the finished product, in much the same way that many other cast parts are made. The molten aluminum is vacuum drawn into the mold. So accurate is the process that the resulting casting requires minimal machining. The forged piston is made very differently. The metal is not molten, but heated somewhat. A blob of this hot aluminum alloy called an ingot is placed in a female mold, and a male ram is pounded into it. The result is not a piston, but a piston blank, which must then under go many machining operations before it resembles a piston.

 

[baiwan]

Re: v-4 crossflow powerhead

I don't see cosiderable difference in performance if any.
Appearance is not important for pistons - so no reason to pay more.
Thanks.
I was told to trim it out, I tried and succeeded.
Thanks again.

 

[mikesea]

Re: v-4 crossflow powerhead

i worked in 2 rebuild shops,weisco forged pistons were the replacement pistons for every engine that we rebuilt,why,I believe that could be an answer that will bring on tooooo much discussion,bottom line is .importantly,forged pistons do require a long and precise break in due to the expansion rate,I know of guys that rebuilt and ran hard from the start ,resulting in a lock up with much damage,