Engine need balancing even with stock internals?

95_5.0_stang · Dec 11, 2006

I'm rebuilding a motor and wondering if I need to have the rotating assembly balanced if I'm using stock internals? The cylinders have been honed and checked by a machine shop. He said there is no need to bore .030. The thing is, the crank will be a brand new (not stroker) 302 crank, pistons/rods will be the old ones cleaned up. Rod/main bearings will be STD. I will have it balanced if it's really needed but if not, then I don't see why I should waste the money. Also, I've searched but can't find an exact answer to this. Thanks.

DMAN302 · Dec 11, 2006

Since vibration can tear the mill apart I'd say the added expense to balance would be worth it just for peace of mind if nothing else.

dastang2 · Dec 11, 2006

no it's not needed unless you wanted to turn higher rpms

95_5.0_stang · Dec 11, 2006

Errr...one of you guys going each way. More opinions welcome.... Thanks so far guys!

1Bad88notch · Dec 11, 2006

I would get it balanced to be safe since you are rebuilding it.

JChalfan · Dec 11, 2006

Personally I'd balance it. Like DMAN said, it's worth the $$$ for peace of mind if nothing else.

It certainly won't hurt.

Jeff

95_5.0_stang · Dec 11, 2006

JChalfan said:
Personally I'd balance it. Like DMAN said, it's worth the $$$ for peace of mind if nothing else.

It certainly won't hurt.

Jeff

Yea, I understand what ya mean, but I'm not into spending $150-200 just for peace of mind. Lol. Either it needs it or not...which I wouldn't know until it was done. I'm just looking for people who have done a stock rebuild like this to see what they've done.

ozanracing · Dec 11, 2006

As long as the piston and and rods are the same weight, and the crank is the same, you don't need to.

FSTRDNU · Dec 11, 2006

yes, get it done, you actually pick up hp, from balancing

JChalfan · Dec 11, 2006

ozanracing said:
As long as the piston and and rods are the same weight, and the crank is the same, you don't need to.

I think he said it has a new crank, which is one of the reasons I recommended the balancing.

I agree if you're doing a budget rebuild on a stock motor, keeping the stock crank, rods, and pistons (in the correct locations), you could get away without balancing.

It just seems to me it's something you will probably use for years to come. The cost of balancing doesn't seem that bad in the long run...

95_5.0, is the car going to stay stock, or is it going to be modded at all?

Jeff

Modular2v · Dec 11, 2006

if it is a 50oz 302 crank and the pistons and rods are from a 50oz motor (should have an e7 number on them) Then i would not balance it as it is not needed

Rick 91GT · Dec 12, 2006

IT NEEDS TO BE CHECKED AND MY BET RE-BALANCED, due to all the production variances you will need to have the bob weight checked (piston/rod/ring/rod bearing) and the crank spun. You would be surprised how different the bob weights are on some of the stock motors I have pulled apart...

2000xp8 · Dec 12, 2006

95_5.0_stang said:
Yea, I understand what ya mean, but I'm not into spending $150-200 just for peace of mind. Lol. Either it needs it or not...which I wouldn't know until it was done. I'm just looking for people who have done a stock rebuild like this to see what they've done.

You're not into spending $150-$200 for peace of mind?

It will cost you that much in new gaskets if it's messed up.

5spd GT · Dec 12, 2006

I did a stock rebuild (.030 pistons), used stock crank, stock rods...

$150 well spent...

Get it done, the engine will rev smoother (more hp?) and last longer...

With a new crank and reusing the older parts, the mixing and matching tells me to have it balanced...

Good Luck with it!

ninety15.0 · Dec 12, 2006

I was in a similar position to yours and i decided the money was well worth it. A couple hundred bucks up front is well worth a smooth revving, more powerful engine, along with the 'peace of mind'. I dont spin my motor past 5500 but i like knowing that 6k wouldnt hurt it if i mess up and over-rev. Lots of good advice from competent stangners who are saying the balancing is in needed and worth it. I would heed their advice.

Red88 RICK · Dec 12, 2006

OK i just got a new STOCK crank from ford racing and im using the old connecting rods but new .030 speedpro pistons. the whole motor is pretty much stock just everything new except for the connecting rods i put the whole bottom end togeather then i remembered to have it balanced should i bother taking it apart just to balance? or with all the stock stuff except for the .030 over will it still be all screwy

Rick 91GT · Dec 13, 2006

Red88 RICK said:
OK i just got a new STOCK crank from ford racing and im using the old connecting rods but new .030 speedpro pistons. the whole motor is pretty much stock just everything new except for the connecting rods i put the whole bottom end togeather then i remembered to have it balanced should i bother taking it apart just to balance? or with all the stock stuff except for the .030 over will it still be all screwy

With the addition of the .030" pistons it will need to be balanced, any change it rotational weight will throw it off.

Engine need balancing even with stock internals?

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