400 crankshaft ?
#779851
08/21/10 07:39 PM
08/21/10 07:39 PM
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Joined: Jun 2007
Posts: 146 florida/ Georgia
Tom Fox
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florida/ Georgia
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hello, did the 400 ever come with a Forged steel crankshaft from the factory? I had always been under the impression that they were all cast( at least the dozen or so I have disassembled) but saw in some book today that showed a parts listing claiming a steel crank.so, did they? and another question, I need a external balance damper for a 383 cast crank, I have a external damper from a external balance 400/440, will it work on the 383? Thanks
Last edited by Tom Fox; 08/21/10 08:25 PM.
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Re: 400 crankshaft ?
[Re: AndyF]
#779854
08/22/10 01:24 AM
08/22/10 01:24 AM
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Joined: Mar 2005
Posts: 862 Iowa State fan
kilroy
super stock
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super stock
Joined: Mar 2005
Posts: 862
Iowa State fan
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How about using a 383 forged crank? Same stroke. Just smaller thrust bearing surface.
1973 Charger, former SE, former auto
I'm not trying to be difficult, it comes naturally....
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Re: 400 crankshaft ?
[Re: kilroy]
#779857
08/22/10 09:52 AM
08/22/10 09:52 AM
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Joined: Jun 2007
Posts: 146 florida/ Georgia
Tom Fox
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OP
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Joined: Jun 2007
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florida/ Georgia
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Quote:
How about using a 383 forged crank? Same stroke. Just smaller thrust bearing surface.
what I have is a newly acquirered car with a '71 383 cast crank engine. it has a mech. vibration at about 2000rpm, and it has a int. steel crank balancer on it now. I want to put a proper ext. balance balancer on it and see if it goes away.I do not have a spare balancer with the correct pt# for a '72 383, but I do have a couple of 400/440 cast crank one's and was wondering if ANY cast crank balancer should be correct?
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Re: 400 crankshaft ?
[Re: kilroy]
#779859
08/22/10 01:56 PM
08/22/10 01:56 PM
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Joined: Mar 2005
Posts: 862 Iowa State fan
kilroy
super stock
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super stock
Joined: Mar 2005
Posts: 862
Iowa State fan
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Was this a balance motor or just a "put together"? Could be a driveshaft vibration.
1973 Charger, former SE, former auto
I'm not trying to be difficult, it comes naturally....
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Re: 400 crankshaft ?
[Re: Tom Fox]
#779861
08/22/10 10:28 PM
08/22/10 10:28 PM
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Joined: Mar 2005
Posts: 862 Iowa State fan
kilroy
super stock
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super stock
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Posts: 862
Iowa State fan
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Yes the balancer and convertor/flywheel on any motor are either neutral balance for internal balance motors or are both have to be externally weighted for external. So yes you need a external balance convertor (weighted) and external balancer.
Two other things to think about 1. Someone has internally balanced motor thats why it has internal balance balancer/convertor but then you wouldn't have any vibration.
2. It was rebuilt without concern to balancing the components and no balancer or convertor will put the vibration to rest without taking motor down and taking rotating assembly to machinist to balance.
1973 Charger, former SE, former auto
I'm not trying to be difficult, it comes naturally....
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Re: 400 crankshaft ?
[Re: kilroy]
#779862
08/22/10 10:30 PM
08/22/10 10:30 PM
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Joined: Mar 2005
Posts: 862 Iowa State fan
kilroy
super stock
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super stock
Joined: Mar 2005
Posts: 862
Iowa State fan
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Oh and if you dont want to buy a new convertor mopar (and Im sure others) sell weight kits with template to make a convertor ext. balance. Ive used one with great success.
1973 Charger, former SE, former auto
I'm not trying to be difficult, it comes naturally....
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Re: 400 crankshaft ?
[Re: Tom Fox]
#779864
08/23/10 12:54 AM
08/23/10 12:54 AM
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Joined: Nov 2003
Posts: 12,494 Western Colorado High Desert
moparmarks
I Live Here
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I Live Here
Joined: Nov 2003
Posts: 12,494
Western Colorado High Desert
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440 and 400 cast cranks do not use the same balancer. The 71 cast crank 383 uses the same balancer as the cast 400. I have a few. PM me if you need one.
Most 400 4-spd motors had steel cranks. Have had a couple 77/78 400 4-spd trucks with cast cranks and a few with steel. All my earlier 4-spd motors were steel cranks.
Last edited by moparmarks; 08/23/10 12:56 AM.
72 Satellite Sebring Plus 440, 72 Dart 5.9 4-spd, 68 Valiant, 73 W200, 78 D100 sb, 78 D200, 98 DAKOTA, . Moparmarks Parts & Restorations Desert Mopar Metal Grand Jct. CO 970-261-7039 http://moparmark.com/motormangj@gmail.com
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