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Old 03-06-2008, 11:34 PM   #71
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Quote:
Originally Posted by Pistonbroke View Post
Uhh, balance shafts aren't used for "vibration control."
Uhh, that's the sole purpose of balance shafts...to cancel out vibrations

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I have little one cyl. R.C. airplane engines and they don't use it...
Yeah...because a RC airplane engine is exactly the same as a car engine...and I'm sure disassembling a RC airplane engine is equally as difficult and time-consuming as taking even a relatively simple four-cylinder apart to replace internal parts. Based on that assinine analogy, I'm going to remove my fuel injectors and the ECU, as well as the alternator and oil filter because my lawnmower's single-cylinder engine doesn't have them either, which means they aren't necessary
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Old 03-06-2008, 11:49 PM   #72
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Quote:
Originally Posted by SkaAddict View Post
Uhh, that's the sole purpose of balance shafts...to cancel out vibrations





Yeah...because a RC airplane engine is exactly the same as a car engine...and I'm sure disassembling a RC airplane engine is equally as difficult and time-consuming as taking even a relatively simple four-cylinder apart to replace internal parts.
You're right about the balance shafts.
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Old 03-06-2008, 11:55 PM   #73
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Read: http://en.wikipedia.org/wiki/Balance_shaft

Quote:
...a balance shaft is an eccentric weighted shaft which offsets vibrations in engine designs that are not inherently balanced
Balance shafts cancel out vibrations caused by an engine being unbalanced. Almost all I4s are imbalanced, no matter how hard you try you cannot build a perfectly balanced I4. Which is why the Zetec has dampening material on its stock idler pulley - to give the vibrations a way out of the engine without going through the main bearings or other sensitive internal parts.
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Old 03-07-2008, 12:02 AM   #74
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Quote:
Originally Posted by SkaAddict View Post
Read: http://en.wikipedia.org/wiki/Balance_shaft



Balance shafts cancel out vibrations caused by an engine being unbalanced. Almost all I4s are imbalanced, no matter how hard you try you cannot build a perfectly balanced I4. Which is why the Zetec has dampening material on its stock idler pulley - to give the vibrations a way out of the engine without going through the main bearings or other sensitive internal parts.
Ya, I thought balance shafts were there to help balance. I learned something new today.
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Old 03-07-2008, 08:02 AM   #75
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Some of you guys crack me up!

All this talk about balancing and no one word said about Harmonics , why is this debate allways taken into left field about Balance and not much if anything said about what it balances

It is a HARMONIC balancer and nothing to do with how it balances the engine

The HARMONIC balancer is there to help take out the HARMONICS the engine makes from the firing on the rotating assy as well as the HARMONICS the accesories try to take into the engine a balance shaft help this some as well

Ford could of saved ?? guessing $1.50 to 3.00 by not putting that little piece of rubber in the balacer and there was what ? roughly 25 million Foci built , You do the math, It wasent put there for looks

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Old 03-07-2008, 11:55 AM   #76
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so like i said above you, why not make a stock size pulley out of aluminum that has the rubber bushing? the lighter weight will let it rev a bit faster. but the accessories wont be slowed down. not to mention its easier to find belts and parts if something happens
aluminum has totally different expansion and stress characteristic properties than does steel.
creating a harmonic balancer out of aluminum would subject it to stresses the metal cant withstand.
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Old 03-07-2008, 10:14 PM   #77
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Quote:
Originally Posted by 1turbofocus View Post
Some of you guys crack me up!

All this talk about balancing and no one word said about Harmonics , why is this debate allways taken into left field about Balance and not much if anything said about what it balances

It is a HARMONIC balancer and nothing to do with how it balances the engine

The HARMONIC balancer is there to help take out the HARMONICS the engine makes from the firing on the rotating assy as well as the HARMONICS the accesories try to take into the engine a balance shaft help this some as well

Ford could of saved ?? guessing $1.50 to 3.00 by not putting that little piece of rubber in the balacer and there was what ? roughly 25 million Foci built , You do the math, It wasent put there for looks

Tom
There is much to learn about engine harmonics, balance, vibration etc. It's pretty deep engineering. It's one of the "boring" things about engines.
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Old 03-07-2008, 10:23 PM   #78
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haha that depends who you talk to, my dynamics prof gets pretty animated about that stuff LOL
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Old 03-08-2008, 03:29 PM   #79
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What engine do you guys think is the easiest to balance or the most naturally balanced? What configuration and number of cylinders?
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Old 03-10-2008, 07:42 PM   #80
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You know what, all this theorizing you guys are doing would be great if the resonate frequencies would flow in one direction, towards the crank pulley/"dampener". Sadly they don't. As with any wave, it will radiate equally in both directions, reach an endpoint and reverse direction at a lesser amplitude.

So, what does this rubber O-ring in the stock pulley do? Like I said, it may dampen the accessories from the crank, that is it.

If you don't believe me, why isn't there some type of dampener on the flywheel side? The harmonics of the transmission can go right through the clutch and to the crank, or vise versa.
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