Trying to learn as much about the 4G63 as possible and I have a quick question that i'm hoping some of you experienced folks could help answer.

In a decision between JUN Forged Pistons & Rods or a JUN 2.2L Stroker; which one would you guys choose based on reliability? Why?

Thanks

 

Depends on how high you want to rev it. Why are you going with Jun? Do you like to overpay for everything?

 

7500-8000 rpm.. i've heard fantastic things about JUN's quality, and i've also heard that their stroker kit is second to none in terms of strength and quality. i've done alot of homework on this and thought i might get some experienced opinions from people like yourself.

as for forged internals, i would also consider Crower Rods, JE Pistons, and Arias Pistons based on what i've heard.

 

If you are going to build the engine, there is no excuse not to forge the bottom end. If the JUN 2.2 does not rely on forged pieces, go with the forged 2.0.

 

correct me if i'm wrong, but I thought the JUN stroker was based on their forged pisons, forged i-beam rods and a forged counter-balanced crank..

 

If I were building a motor I would use Crower rods and Arias pistons and build a 2.2 liter. But that's just me. If you like what Jun offers you then by all means.

 

what about the crank?

i thought that was an integral part of the stroking process.

 

stock for 2.0. i haven't really researched aftermarket option for a stroker. I'm not ready to build the motor yet.

 

JUN stroker cranks a forged billet milled by their own folks.

 

many of the fastest drag evos are still using the basic 2liter motor.
so it depends what u would like to use your car for.
I am into drag racing......and i just rebuilt my motor using CP pistons and crowers rods.

 

It depends on what you want, more low end torque or big revs with the 2 litre.. Yes JUN's quality is one of the best out there but way way pricey, I'm using a Magnus 2.3 stroker with Pauter rods and custom ROSS forged pistons without any issues for 2 years already. Only downfall is with bigger stroke, you get less revs as in my case, max rpm 7000 for reliability.. JUN stroker, 8000 rpm... with a built 2 litre provided the cams allow it 9000 rpm is not a problem on most applications just like my evo3 drag car... The only thing that I do to make the weak factory crank stronger on the 2 litre 7 bolt is to stress relieve and nitride it..

 

TomeiEvo,

It sounds like you have a very impressive setup. I wanted to redline at 7500-8000 and produce power all the way to that point; but still increase the low-end torque significantly enough to experience that initial thrust that you'd comparably feel in a USDM 2.5L WRX STI.

I understand that JUN is very, very overpriced. I am very open minded to other companies, but I also understand that sometimes you need to pay a premium to obtain serious OEM-like quality. I need the type of reliability you're getting with your 2.3- this isn't an option for me.

I am in no rush to stroke or even build my engine just yet. I have other priorities for my finances that need to take precidence over my Evo for the moment. I just want to continue doing my research and homework as well as get feedback from people who have taken this route.

 

What you want is a stroker that is balanced and blueprinted, stress relieved, etc. I have a 327 V8 motor that revs to 8K just fine. You can do it, just get ready to have it done right.

 

ahh, the chevy 327 sb.

incredible engine.