What kind of effects will ej20 crank, and piston rods will this have on an ej22's compression and strength for forced induction potential?



~Mike

How do you plan to fit a 9.20mm piston into a 9.69mm cylinder? Beyond that the cranks are the same stroke and there's nothing to be gained by messing with that...

I wasn't talking about the piston heads, i know that those wouldn't fit, i just wanted to know about the difference between stroke and would be, with the different crank and rod.



~Mike

What kind of effects will ej20 crank, and piston rods will this have on an ej22's compression and strength for forced induction potential?



~Mike

crank is same stroke length, so no change in compression ratio. rods again same length no change. depending on MY there may be a better/stronger rod/crank avail. but no change for boostability.

matt was saying actual piston diameter i think.

and then you say piston heads. do you mean the actual piston, or the cylinder heads that are bolted to the outsides of the block? the head would change the compression ratio if lowered to more reasonable #. say 8.XX:1 vs 9.XX:1. using a bigger displacement head 2.2 on a 2.0 block/1.8 block is good, same as 2.5 heads on a 2.2 block or some variation if using a stroker motor setup.
sometimes wording is misconstrued, and misleading. use terms everyone shares or try and spell it out. even if you sound like a jerk, at least you get the point or question out there so someone can help the best they know how. --keith

I have no interest in changing the pistons to the ej20 pistons because i know they wouldn't fit.

I was talking about the crank and the piston rods, mainly for the purpose of stronger internals-ej20 internals are forged. For compression and flow i'm going to put ej25 heads on the ej22 block when it comes time to put the turbo on.



~Mike

Then just say rods. Your original post reads like some grammar nightmare suggesting you are looking at crank, pistons and rods. It's very confusing. What other rods are their in an engine? And they are generally called con-rods. I have never in my life heard them called piston rods...

Then just say rods. Your original post reads like some grammar nightmare suggesting you are looking at crank, pistons and rods. It's very confusing. What other rods are their in an engine? And they are generally called con-rods. I have never in my life heard them called piston rods...[/


:lol: My bad, good point though. I guess i was trying to sound more like I knew what i was talking about then i truly do


~Mike

Not to worry. And if the funds are there, follow kheff's advice. Using DOHC Ej25 heads on the Ej22E block is a great combo. It gets the CR down and lets you safely run more boost. You can also run 10psi or so with good tuning and an intercooler on a bone stock Ej22e. Lots of guys have done it. Hell, FAT even makes a turbo kit for doing just that...

Using DOHC Ej25 heads on the Ej22E block is a great combo. It gets the CR down and lets you safely run more boost.

That's my plan, i'm just worried about the internals of the ej22e, since they aren't forged (thus the thought of the ej20 internals). I don't plan to make this a drag queen but i would like to be able to have a little fun with the boost everynow and then.

Okay so, correct me if i'm wrong but since the crank and rods from an ej20 would have the same stroke-that means that if i replaced the ej22 crank and rods with those of the ej20 it wouldn't effect my spool time, right?



~Mike

you'd be fine with the 2.0 rods etc. same size everything. --keith

so say you had an ej22t sb and a ver 5 sti long block that was mint you could get the cenk polished and slap new 2.2 pistons in the 2.2 block with the 2.0 sti crank and rods? with a nice hone, if thats all thats needed, and some mahles or something and new coated bearings you would have a really nice setup. but are the ver 5 sti rods better than the ej22t? are the cranks the same? i thought the jdm sti cranks had better features for oiling?? correct me if im wrong. could it spin up to 8k? is a usdm sti crank the same with the excepttion of the stroke or a 2.5 na 01 rs crank? this would get me to a 2.35 would this combo rev tto 8k? are the rod journals and mains the same size? i know i could of used search but i had a lot of ?? and figured id throw them all out there. which ever one of these setups works its gonna have a dry cartridge big 16g thats p+p and coated, ver 5 sti heads and man, sard 850s, hks dp,tial 38mm, perrin inlet, 05 sti tmic,and and ecuteked 03 wrx ecu. looking to spin the 16g till it runs out and set the redline there but want to build for 8k just in case i want to go big. looking for 320 whp on a good safe 93 tune.

The forged Legacy EJ22 internals are arguably the strongest Subaru ever put out to the public. It was this same rotating assembly that was in the 22B and there are some people running WELL in excess of 20+ psi on that rod and crank with 450 whp and more..

sick thats nice

You can put the EJ25 guts in the MUCH stronger fully closed deck block of the EJ22 and slap a big JDM V8 AVCS head on it to lower the compression and start twisting that boost controller on your new EJ22/25

yeah im just gonna get a257 sb i can get one for a good deal. i have ver 5/6 sti heads. should be fun wont rev as high but will have that low end tq.