stroking without balance shafts

[mightymousestd]

I wanted to stroke the 6 bolt I'm putting in my 96 gst but the block I got from a guy already has the balance shafts out...I know it's typically a good thing to take them out, but I didn't know if the stroked engine would be so imbalanced at low rpm that it might need them back. I've taken them out of two cars with the stock cranks and not seen any problems, but I've never done it to a stroked block.

 

[sbiggi]

Balance shafts have nothing to do with the "balance" of the internals.

They just cancel out vibrations so you dont feel them.... thats it.

 

[jrohner]

Stay away from the BS's. They are for people who mistakenly bought dsm's when they were looking for a cadillac.

 

[mightymousestd]

awesome...appreciate it

 

[TunaTalon]

The longer stroke of the 2.3L will increase the second order harmonics that the balance shafts are designed to cancel. Lower weight pistons and rods will decrease the second order harmonics.

If you use light weight stroker components such as a Wiseco/Eagle combination the lower weight will compensate for the longer stroke. The stroker will vibrate then like a 2.0L with stock parts.

 

[HIGHPSI4]

With my engine, 2.4 bored and no balance shafts and 3X cams, idles smoother and as quite as a stock 2.0 engine. I have a great engine guy that balanced everything very well.

 

[mightymousestd]

thanks guys...by chance would anyone know the main bearings I need cause I'm having hell finding ones that will work right

 

[dsm-onster]

With my engine, 2.4 bored and no balance shafts and 3X cams, idles smoother and as quite as a stock 2.0 engine. I have a great engine guy that balanced everything very well.

Read:

Balance shafts have nothing to do with the "balance" of the internals.

They just cancel out vibrations so you dont feel them.... thats it.

You're engine builder didn't balance out the 2nd order harmonics, unless he cut and magically welded your I4 into a V4. The vibration the b-shafts cancels out vibrations created by the piston movement itself, not by the unequal weight between each part.

Many don't mind those 2nd order vibrations or they don't have solid motor mounts. Thus your positive results. I didn't mid them until I drove for a hour to Ocean City in stop and go traffic. The vibrations at the lower rpms is like a massage chair with solid (welded or biglady mod) motor mounts.

 

[HIGHPSI4]

I understand the 2nd order vibrations. I do not have them as an issue in my engine. I have Prothane mounts and I have no vibrations. That is all I stated.

BTW, every engine is different.