Balancing crankshaft? Important?

[preludeachris]

I'm about half way done with my 7-bolt build and I was wanting to balance the crank at a machine shop. Is this important to do? Can I get away with just polishing? Thoughts? (Engine mods include; 272 cams, Balance shaft removal kit, reground valves manly springs, stock pistons and rods ARP bolts all around)

Thanks again.

 

[black97spyder]

It's not crucial that u get it done but it puts the icing on the cake. You can live with just polishing but hell for another $100 You can get it balanced and she will run smooth all throughout the rpm range

 

[preludeachris]

I should add that I have a balance shaft removal kit. Not sure if it makes a difference.

 

[StarFawkes]

If you're going to have balancing done you might as well get your whole rotating assembly balanced. No point in having your crank balanced on its own when the differences in the pistons/rods are going to throw it back off balance.

 

[agentorange313]

I'm about half way done with my 7-bolt build and I was wanting to balance the crank at a machine shop. Is this important to do? Can I get away with just polishing? Thoughts? (Engine mods include; 272 cams, Balance shaft removal kit, reground valves manly springs, stock pistons and rods ARP bolts all around)

Thanks again.

Is it a stock crank, or an aftermartket one, does it need to be cut at all?

the mods dont really matter in this situation. Its your rotating assembly, valves and springs dont have a bearing on how assembly will perform.

I know people do budget builds but peace of mind is peace of mind. Personally, I would have the whole assembly balanced, cranbk rods pistons flywheel

 

[white92talontsi]

You don't balance a 4 cylinder crank the same way you balance a v6 or a v8.

Tell the machine shop that all you want to do is to make sure that all the counterweights weigh the same.

 

[preludeachris]

Is it a stock crank, or an aftermartket one, does it need to be cut at all?

the mods dont really matter in this situation. Its your rotating assembly, valves and springs dont have a bearing on how assembly will perform.

I know people do budget builds but peace of mind is peace of mind. Personally, I would have the whole assembly balanced, cranbk rods pistons flywheel

Its a stock crank, and yes the shop already told me to bring in all the rotating parts so they could balance accordingly

 

[black97spyder]

With a 4 cyl the crank the counterweights are 180* away from each other so there's not much to balancing them. Take your rods, pistons, crank, and flywheel to all be a part of it being balanced. It will make everything tons smoother since you have the BSE kit

 

[Archer Fabrications]

Question, i had my whole rotating assembly balanced and rotated, if i decided to change the flywheel how would i make sure it's all in balance with the rest of things?

 

[BogusSVO]

The fly wheel should have been neutral balanced when the rotating assembly was balanced.

So all you should have to do is take the flywheel and pressure plate in, and have them checked and brought to a true neutral balance.

 

[Archer Fabrications]

Thanks

 

[NHerron]

IMO dont be cheap when its the core of the engine and hard to go back. Everyone has regrets, dont chance the possibilty of it.

That being said, my bottom end is all forged, stroker, and bs delete. I had my crank checked for straight, journals measured and polished, and balanced. I then balanced everything else myself, minus the flywheel/pp since those have to be spun.

Ill tell you what, theres no vibration whatsoever anywhere and glad I took all the extra little steps I did. But then again I wasnt stock rebuild and had some money into the project.

Good luck

 

[preludeachris]

Just for the record I just went ahead and just got a polish since I didn't really change any of the bottom end. (stock rods pistons crank) Also this saves a fair amount of money for my budget build.