sliding wrote:
One of the things that troubles me the most, is rotating assembly
balancing. Problem is that in Croatia nobody does it.
You can have crank balanced, but nobody asks for pistons or
rods for this. They just balance crank?!

From what I have ben reading on internet, it's important to know
exact weight of rotating parts to be able to balance the crank.

And also from what I've read, balancing [B]IS VERY IMPORTANT[/B].

And now, it's hollidays, and I have some time, so I took David Vizard's
"How to build max performance Chevy on a budget" book and here is
a C/P of very interesting part of the text:
[B]"... balancing does not mean that there will be more destructive
internal engine loads present. What it does mean is that whatever
forces are generated at one journal may not be fully countered by
forces generated at another. The result is an out-of balance engine.
But the engine is no more likely to fail than if it were perfectly
balanced."[/B]

And here is another C/P:
[B]"If the budget exists, balancing the rotating assembly is recommended.
But be aware that your motor will be just as reliable and run just as
well without balancing."[/B]

???

jsup wrote:
If you've ever driven a car with a motor that was balanced, then in one that wasn't you can feel the difference, the balanced motor spins up more smoothly.

Or, it was all in my mind.

I'm not sure which.

sliding wrote:
Quote:

[B]"... balancing does not mean that there will be more destructive
internal engine loads present. What it does mean is that whatever
forces are generated at one journal may not be fully countered by
forces generated at another. The result is an out-of balance engine.
But the engine is no more likely to fail than if it were perfectly
balanced."[/B]

Blade_1 wrote:
Quote:

sliding wrote:
Quote:

[B]"... balancing does not mean that there will be more destructive
internal engine loads present. What it does mean is that whatever
forces are generated at one journal may not be fully countered by
forces generated at another. The result is an out-of balance engine.
But the engine is no more likely to fail than if it were perfectly
balanced."[/B]

Well, the Vizard statement is made up of 4 negations, and a negation is exactly that - NOTHING.

"... balancing does NOT mean..." OK; I don't need to know what something is NOT, just tell me what it DOES mean.

"What is does mean ... whatever(?) forces ... may NOT be countered..." HUH? They may NOT? Or they MAY, I guess??? I should flip a coin? Cause that statement doesn't say anything definitive either.

"The result is an out-of-balance engine". HUH again? What if those forces WERE countered? THAT don't matter either, cause he says the result is something that is NOT [something].

"But the engine is [not] ...". See comment #1.

This Vizard guy sounds like a politician. 'See how many happy words you can say, and NOT be saying anything'.

He wouldn't want to listen to MY questions.

sidney004 wrote:
This is also a very informative site with a lot a pro engine builders that post:
http://www.speedtalk.com/forum/viewfo ... 84a06bd81af1f917a413a2eca

sliding wrote:
One problem solved. I contacted a company (actually it's very small
family business) today about balancing.
One very friendly man anwsered me and first thing that he asked me,
when I told him what I need, was;"do you know exact weight of all
parts, or even better, do you have all of the parts to bring them to me."

This man has worked with balancing for 30 years now, and he also has
experience with v-8 engines. Mostly for marine use, but V-8's.

One thing that he agreed with all of you and me, is that balancing
is a must, even for street driven engines, and of course, even more
for high rpm racing engines.

I don't know what are prices for balancing in US, but it will cost me
arround $150. If it'll be done good, I'll be more than happy with that!

dan0617 wrote:
Not to steal the thread but here is a question along the same lines, kind of fits in this thread:

If someone buys an aftermarket rotating assembly, like made by Scat or Eagle or ???, do you need to install it then go have the engine balanced, do you take it to the machine shop to get it balanced before you install it in the block, or is it already balanced since it came as a kit and all you need to do is install it and be good to go?