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How did AMC balance our motors? |
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Trader 
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Joined: May/15/2018 Location: Ontario Status: Offline Points: 6883 |
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 Posted: Oct/20/2018 at 5:16am |
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With heavier pistons they would remove rod material if possible to achieve the same rotating mass and not have to re-balance the rotating assembly.
Just a guess, but your +0.010" pistons were likely heavier, but within rod weight removal. |
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SC397
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Joined: Apr/30/2009 Location: Michigan Status: Offline Points: 5476 |
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Posted: Oct/20/2018 at 6:30am |
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Here is a picture of the actual SAE document.
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Boris Badanov
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Joined: Dec/14/2013 Location: NH USA Status: Offline Points: 4209 |
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Posted: Oct/20/2018 at 11:29am |
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You do not need a assembled engine for the balancing. Just an assembled reciprocating assy. Most likely it was done on a machine. For mass production all that was needed was to separate the weights in lots. I seriously doubt every engine was spin balanced. The cost would be prohibitive. Once you have set up a standard this would be a serious waste of time. Static balance cranks, balancers and flywheels would do just fine. All parts weighing within tolerance is more than enough. |
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Gremlin Dreams
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SC397
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Posted: Oct/20/2018 at 12:04pm |
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They use the word "dynamic" in the 1968 390 SAE papers.
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PHAT69AMX
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Joined: Jul/07/2007 Location: West Virginia Status: Offline Points: 5919 |
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Posted: Oct/20/2018 at 2:30pm |
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Hey SC397, on the SAE website, the page 1 preview image of the AMX-390 V-8 paper,
the lower left "680443" document number is marked out and "680493" is penciled in below it... Appears you have real paper copies of those SAE documents... cool.... I tried but failed to find it again on Eddie Stakes planethoustonamx page iirc to find this vintage AMC corporate picture of an Engine on some sort of test stand, guess it looks to elaborate to be just an Engine Balancing Machine... so picture credit goes to Eddie Stakes iirc, will post link if I can find it again...  |
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SC397
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Posted: Oct/20/2018 at 3:00pm |
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Yea, that looks like a 1968 343 on a dyno to me. Neat stuff! |
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george w
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Posted: Oct/20/2018 at 3:52pm |
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Sure looks like the 68 Caravelle Blue engine color.
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Long time AMC fan. Ambassador 343, AMX 390, Hornet 360, Spirit 304 and Javelin 390. All but javelin bought new.
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pacerman
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Posted: Oct/20/2018 at 6:48pm |
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I have an AMC factory service 343 short block which is going in my AMX. I supplied a new clutch and a virgin Scheaffer 40 pound steel flywheel with the correct part number for an AMC 343. Everything else including bearings and rings was in the motor from the factory. The guy that precision balanced the assembly said it definitely needed it. Factory balance was not too good. That's all I remember. Joe
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Happiness is making something out of nothing.
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Steve_P
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Posted: Oct/22/2018 at 9:05am |
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Again, every gen 2 V8 engine was dynamically balanced on an automated machine that spun it with a large electric motor. As said, the picture above is a 68 engine on a dynamometer. I think that was in one of Larry Mitchell's books.
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rang-a-stang
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Joined: Sep/25/2018 Location: Camarillo, CA Status: Offline Points: 272 |
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Posted: Oct/23/2018 at 11:56am |
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Wow! Awesome stuff in here!
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