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232 vs 258 |
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2drwgn
AMC Nut Joined: Jul/02/2007 Location: Ocala, Fl. Status: Offline Points: 248 |
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I just counted the weights on my 199 crank, and there are 6
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1966 American convert
4.0 FI AW4 |
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FSJunkie
AMC Addicted Joined: Jan/09/2011 Location: Flagstaff, AZ Status: Offline Points: 4741 |
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1965 service manual says the 199 and 232 should both have 8 counterweights. 1972 service manual says the 232 uses 8 counterweights and the 258 uses 12 counterweights. 1984 service manual says the 258 only has 4 counterweights. So who knows. Looks like they messed with crankshaft balancing a lot through the years.
Edited by FSJunkie - Nov/28/2015 at 1:50am |
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1955 Packard
1966 Marlin 1972 Wagoneer 1973 Ambassador 1977 Hornet 1982 Concord D/L 1984 Eagle Limited |
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farna
Supporter of TheAMCForum Moderator Lost Dealership Project Joined: Jul/08/2007 Location: South Carolina Status: Offline Points: 19611 |
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Ive only seen the 70s 12 counterweight cranks and the 80s four. Starting in January 1980 (engine plant went by calendar year for most changes, not model year... makes some things hard to figure out until you know that!) the 258 went on a diet, losing somewhere around 40 pounds. Changes in castings, the crank counterweights, aluminum intake, and 7/16" vs 1/2" head bolts all contributed. The crank made up the most weight loss of a single item, but then it's the biggest casting after the block and head.
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Frank Swygert
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Spin Doctor
AMC Apprentice Joined: Apr/05/2012 Location: Kenosha, WI Status: Offline Points: 78 |
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I was working in the maintain emcee area in 818 (6 cylinder blocks, heads and V8 heads when the lightweight castings first started to come in and was assigned to the engineer overseeing the project. The first time they put one of the blocks into the broach the clamping pressure broke the casting into pieces. Once they solved that problem (putting material back into the casting and clamping pressures) the castings would break under the machining load. This was solved by casting in starts between the bearing webs that then had to be removed prior to the rest. Heads we had similar issues. So I can imagine that cranks had problems initially. Once the problems were straightened out we had people from GM, Ford and Chrysler come through to see how we had sliced the problems as they were going through the same issues
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farna
Supporter of TheAMCForum Moderator Lost Dealership Project Joined: Jul/08/2007 Location: South Carolina Status: Offline Points: 19611 |
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Nice to hear that AMC taught the "big three" a thing or three over the years! Lots of R&D money doesn't always solve problems. When you absolutely HAVE to solve a problem to make a buck (and keep your job...) things get done quicker!!
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Frank Swygert
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