4G63 stroker

[Street Surgeon]

I have done TONS of my own research as well, and the only place here in the states that runs the balance shafts in their stroker combos is Jackson Automotive Machine. All the other reputable and fast companies do NOT use them. Magnus, ffwdconnection, AMS, etc.

When I spoke with the sales rep over @ JAM they explained that the shafts are necessary to prevent the harmonic vibrations that happen in this stroker combo. Supposedly, sometimes flywheel bolts can back out as a result of this (use a thread locking compound just in case) and sometimes there have been a few cases of cranks cracking (upon futher research of my own these have actually turned out to have been cranks that were turned/machined already though) so that's why they cracked them.

The downside obviously is that you can spin a bearing and destroy the motor, or snap a balance shaft belt, throw off timing, and then destroy the motor. I bought the JAM stroker kit and am NOT be running the shafts. There are already tons of 2.3s over here that don't run the shafts with great success.

Another thing that was kinda fishy is the "type" of balance shafts JAM uses! You would think since they use a 4G64 2.4l crank, that it would make sense to use the balance shafts from a 4G64 motor as well to cancel out the vibration right? But they use the 2.0 4G63 balance shafts :roll: When I asked her why they didn't use the 2.4l balance shafts to cancel out the 2.4l crank vibrations (they are different, the 2.4l balance shafts are heavier and contain a different "swinging weight value") she said "Well, what's the difference?!?" Heh.... Ooooookay and she's supposed to be the expert?!?

Anyways, sorry for the longwinded post, cheers.

 

[Rockabilly]

Thanks Street Surgeon. I didn't know the 4g64 had heavier ballance
shafts. I don't have ballance shafts in my 46g3. I do know what you
mean by bolts coming loose tho. The 4 bolts conecting the VR4 auto
convertor to the ring gear came loose when I backed off in 2nd at
high revs :shock: I thought the box shit it'self. Locktite wasn't used
that time. Lesson learnt, use locktite on flywheels & convertors.

 

[Street Surgeon]

Whenever I replace a clutch and have the flywheel replaced or resurfaced I always buy new flywheel bolts too. You don't have to, but I get new ones, give em a lil' locktite, and then torque them down a few extra lbs juuuuust to be safe :wink:

 

[Meek Automotive]

Fast especially here in Australia does not mean reliable to say it politly.
Most new customers cars here a far from fast and a long way off reliable.

And when it comes to Flywheel splitting somone in half all i can say to my customers is weve done as much as we could to try an avoid it.

But to run the balence shafts in the 2.3 stroker they have to be lathed down to fit and thats just to fitt them in let alone using a shaft with a heavier counterweight.
the procedure for clearence of balence shafts and oversizing of balence shaft bearings are all available.Its just alot more expensive with it all said and done correctly.
Another good piont to add is durability also with the shafts in.
Some experts that have never even built or driven these motors are claiming they only last 50,000kms is with or without the shafts.
And what of the power they making relevant to the 2ltr do they or do they not wear just as bad.
In my experience they all wear out with much added boost early ie 25+.