360 Magnum balance question...
#2459033
02/28/18 07:37 PM
02/28/18 07:37 PM
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Joined: Oct 2017
Posts: 4 Canada
FC7Challenger
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I bought a challenger with a 360ci/380hp crate motor. I am in the process of swapping the 727 to a a518. When I pulled the trans out,I notice it had a standard non balanced flex plate and a non balanced torque convertor. With all the research I have done, this motor should need a weighted flex plate. I have had the car for over 12 years, spun it well over 6000rpm lots and never felt an unbalanced feeling ever. I am told if it isn't correct, you will know! Does this make sense to anyone? can the 360 be internally balanced? any thoughts or advise would be appreciated, thx.... here's the flex plate and balancer.........
Last edited by FC7Challenger; 02/28/18 07:39 PM.
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Re: 360 Magnum balance question...
[Re: FC7Challenger]
#2459054
02/28/18 08:31 PM
02/28/18 08:31 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
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Lincoln Nebraska
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Welcome here! Yes a 360 can be internally balanced (takes Mallory metal) cuz I had one (360 LA) internally balanced so I could run any neutral converter. tho in hindsight it may have been cheaper to externally balance with the offset plate THEN run any neutral converter. As you know mags are different & I would wait for others to chime in. You'rs may already have been balanced.
live every 24 hour block of time like it's your last day on earth
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Re: 360 Magnum balance question...
[Re: FC7Challenger]
#2459122
02/28/18 11:05 PM
02/28/18 11:05 PM
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Joined: Jan 2003
Posts: 1,255 Columbus, GA
Michael Ecks
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pro stock
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Columbus, GA
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Is this the magnum version? Here's from a Mopar Muscle article where the dynoed a 360/380 magnum crate. "Complete From Oil Pan To Intake, The Crate Just Needs Accessories, Pulleys, Carb, Headers, Plugs And Wires, And It's Ready To Fire. The 360 Magnum Has A Specific Balance Factor, Different From The Earlier 360s. The Damper Comes With It, But The Flywheel, Flexplate, Or Converter Does Not. When Ordering, Be Sure To Specify Magnum Balance." http://www.hotrod.com/articles/mopp-0303...e_buildup-crate
"The happiness of your life depends upon the quality of your thoughts" ~ Roman Emperor Marcus Aurelius
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Re: 360 Magnum balance question...
[Re: FC7Challenger]
#2459255
03/01/18 05:14 AM
03/01/18 05:14 AM
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Joined: Aug 2003
Posts: 43,719 Bend,OR USA
Cab_Burge
I Win
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Last edited by Cab_Burge; 03/01/18 05:17 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: 360 Magnum balance question...
[Re: Porter67]
#2460536
03/03/18 04:23 PM
03/03/18 04:23 PM
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Posts: 4 Canada
FC7Challenger
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thanks for the help, I guess I'll just leave it the way it was. the bearings looked really good when I pulled them out at that time...
Last edited by FC7Challenger; 03/03/18 04:24 PM.
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Re: 360 Magnum balance question...
[Re: FC7Challenger]
#2460546
03/03/18 05:00 PM
03/03/18 05:00 PM
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Joined: Oct 2007
Posts: 4,219 New York
polyspheric
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master
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New York
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w/r/t partially internally balanced
Just a guess: adjusting the crank for greater balancing accuracy allows a standard (balanced, not neutral) damper and flex plate to be used (both factory and SEMA). If the adjustment were made to these external parts, they wouldn't work on any other engine.
In general any compensating weight should be located as closely as possible to the mass it's opposing to minimize "rocking couple". Do as much as you can with the counterweights, and only go external if that's not enough.
What about Mallory? The weight difference between the steel/iron you drill out and the Tungsten alloy you replace it with is sometimes not enough to correct the balance internally, unless the whole crank is full of holes: $$$. If you're pretty close and want to use neutral external parts, the same (drill out and fill) process can be used with lead instead of tungsten - you just have to use more of it (weighs less than Tungsten).
Boffin Emeritus
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Re: 360 Magnum balance question...
[Re: FC7Challenger]
#2460668
03/04/18 12:07 AM
03/04/18 12:07 AM
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Joined: Jan 2004
Posts: 8,637 fredericksburg,va
cudaman1969
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I have a 426 Hemi crank with every journal full of lead and straps of steel welded over the lead to keep in there. Craziest thing I ever saw
Last edited by cudaman1969; 03/04/18 12:42 PM.
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Re: 360 Magnum balance question...
[Re: FC7Challenger]
#2460718
03/04/18 02:27 AM
03/04/18 02:27 AM
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Joined: Nov 2003
Posts: 1,890 Pittsburgh,PA
RTSrunner
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top fuel
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I bought a challenger with a 360ci/380hp crate motor. I am in the process of swapping the 727 to a a518. When I pulled the trans out,I notice it had a standard non balanced flex plate and a non balanced torque convertor. With all the research I have done, this motor should need a weighted flex plate. I have had the car for over 12 years, spun it well over 6000rpm lots and never felt an unbalanced feeling ever. I am told if it isn't correct, you will know! Does this make sense to anyone? can the 360 be internally balanced? any thoughts or advise would be appreciated, thx.... here's the flex plate and balancer......... That's not a "Magnum" flexplate on your engine,it would be more of a circular unit with a balance weight on it.The Magnum also uses less balance weight than the LA 360 engine. The LA engine has the balance weight welded on the torque converter.Odd that it doesn't vibrate or show any measurable wear.
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Re: 360 Magnum balance question...
[Re: RTSrunner]
#2460841
03/04/18 12:56 PM
03/04/18 12:56 PM
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Joined: Jan 2004
Posts: 8,637 fredericksburg,va
cudaman1969
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fredericksburg,va
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I bought a challenger with a 360ci/380hp crate motor. I am in the process of swapping the 727 to a a518. When I pulled the trans out,I notice it had a standard non balanced flex plate and a non balanced torque convertor. With all the research I have done, this motor should need a weighted flex plate. I have had the car for over 12 years, spun it well over 6000rpm lots and never felt an unbalanced feeling ever. I am told if it isn't correct, you will know! Does this make sense to anyone? can the 360 be internally balanced? any thoughts or advise would be appreciated, thx.... here's the flex plate and balancer......... That's not a "Magnum" flexplate on your engine,it would be more of a circular unit with a balance weight on it.The Magnum also uses less balance weight than the LA 360 engine. The LA engine has the balance weight welded on the torque converter.Odd that it doesn't vibrate or show any measurable wear. I just removed the trans from an 01 5.9 magnum and the flex-plate has the senser pickup flange-holes around the edge. Converter has no weights and no weighting on the flexplate that I could see either. I do have the right B&M flexplate on my 05-5.9 hanging on the engine stand. I know the pistons are different in the 360-380 hp engine, maybe why a regular plate is used. I'll try to weight the difference between the stock and 380 piston.
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Re: 360 Magnum balance question...
[Re: RTSrunner]
#2461473
03/05/18 02:16 PM
03/05/18 02:16 PM
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Joined: Jan 2004
Posts: 8,637 fredericksburg,va
cudaman1969
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master
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I just removed the trans from an 01 5.9 magnum and the flex-plate has the senser pickup flange-holes around the edge. Converter has no weights and no weighting on the flexplate that I could see either. I do have the right B&M flexplate on my 05-5.9 hanging on the engine stand. I know the pistons are different in the 360-380 hp engine, maybe why a regular plate is used. I'll try to weight the difference between the stock and 380 piston. I guess the crate motor could have a different balance factor,odd that the crank balancer is for external balance and a zero flexplate.As someone said it could be partialy internal balance. [/quote] Meant to add the stock piston are dished and the 380 is flattop with those coated inserts on the skirt.
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