need help on forged pistons.

NICO · Post by **NICO** » Thu Mar 09, 2006 2:26 am

^^ nice pistons

you no what i have never blown a rod, a crank shaft, ever in my life on my subaru ej22t its just the dame pistons that blow out after a while. i didnt even boost the shit out of the motor also to blow these.

i am so confused on what to do, get cryo treating? or wiseco pistons?

what do i have to do to these pistons if get them from wiseco? is it a huge think that has to be done?

evolutionmovement · Post by **evolutionmovement** » Thu Mar 09, 2006 5:58 am

You could always cryo treat the forged pistons. Now would cryo treating allow the tolerances of a forged piston to be tighter, hence making it more streetable? It may not matter as someone would have to know the difference with a particular piston and use the same process for cryo treating (I imagine these could vary slightly between shops).

206er · Post by **206er** » Thu Mar 09, 2006 7:55 am

that is a very good point since isnt the main beef with forged pistons their tendency to "grow?" from what the cryo guy told me that I wrote in my previous post, could be a good solution.

93forestpearl · Post by **93forestpearl** » Thu Mar 09, 2006 8:26 am

Forged pistons are going to be FAR superior to cast pistons any way you look at it. Have you seen the grain structure of either? Forged metals have ten times the grain density that cast materials do. Its the boundaries between the grains that give metals their strength.

The tolerances given to me by Wiseco for the psitons was .003 in.

NICO, I would get the pistons, and chill with your rods if thats what you want to do. Spending the money and time on the cryo treating, I feel, is gonna leave you short-handed. Cryo-treated cast pistons are still cast, and they still weigh a ton. Those Wisco's are all within .5 grams of 409 grams. Much lighter than stock. They are worth the money. You just need the block bored .020 over, or .040, which ever set you want. I felt better about taking .020 out of .125 than .040 out of the sleeve. When doing a full rebuild, I think, hot-tanking the block is a good idea. I don't know about the economy in your town, but with the boring, double hot tank of the block, and a head job, it all is running me about $300. Money well spent in my opinion.

Holla, I'm wasted

and wish I had some

NICO · Post by **NICO** » Thu Mar 09, 2006 9:21 am

^^ hahahaha.

evolutionmovement thats a good idea forged pistons and cryo the pistons. you sold me, that's what i am doing.

93forestpearl so i got to bore my block a little to put the pistons in (.020) , does that mean its going to be a little bigger like 2.2l to 2.3l or something like that? im going to check in to this .020 boering out my block thing.

i no when i ordered my pistons at the dealers, my cuzin siad do you want this size this size or standerd size. i told him standerd, thats what i all ways get.

i am doing the forged pistons from wisco cryo treat them and thats it. i never ever want to open this block up ever agian.

thanks for the help guys, i am going to start this right away.

NICO · Post by **NICO** » Fri Mar 10, 2006 12:44 am

ok guys i got a problem my dad all most killed me.

i told him we need to bore the block to fit the pistons and i all most got a italain back hand. he yelled AT ME YOU MAKE IT WEEKER STUPIDO. yup thats how it went down.

cant i get stock forged pistons no over side ones.

93forestpearl · Post by **93forestpearl** » Fri Mar 10, 2006 1:12 am

For standard size, you'd need custom pistons from CP or Arias. I suppose when you figure in the boring of the block for the Wisecos, the cost would be about the same, I'm guessing.

About making the block weaker. Boring it .020 over is only taking .01 out of the sleeve which is .125 thick. Its a non-issue. I asked several machine shops and Archer Racing and they all said its no big deal and won't affect the structural integrity of the block.

I got my block and heads back from the machine shop today. The total cam to $371 for the boring, honing, and cleaning of the block, the valve job, cleaning and decking the heads, checking the roundness of my rods, and Clevite 77 main and rod bearing. On wednesday, my pistons, rods, crank, flywheel and pressure plate are off to Blackwell's Custom Balancing. He quoted me $125 for the full job. I like this Duluth economy

NICO · Post by **NICO** » Fri Mar 10, 2006 4:16 am

^^i asked him why he siad it would make it weeker, he siad that subaru puts a special seal on the walls and once you bore it out it weekins it.

555BCTurbo · Post by **555BCTurbo** » Fri Mar 10, 2006 7:18 am

Actually, forged pistons don't expand, which is what causes the oil control problems, because engines with stock cast pistons are engineered for the expansion that happens with heat...so when you remove that capacity of the piston to expand, then the bore still does, and therefore some more blowby will result...but they are far superior as far as metalurgy goes.

NICO · Post by **NICO** » Sat Mar 11, 2006 9:14 am

could i cryo treat my raceing head gaskets there all metal.

ok home work is done, arias is getting my ej22t STD size pistons, and there copying them to make forged ones.

thanks for all the info guys, and the cryo treating lessons. you guys give me good ideas you no that.

when the pistons come in i will let you no, + then i got to strip down the ej22t dohc motor back down. forged pistons and metal head gaskets NO MORE BLOWING UP i hope.

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need help on forged pistons.