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Re: Please, please help with vibration problem
[Re: pauly v.100]
#931064
02/21/11 03:19 PM
02/21/11 03:19 PM
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Joined: Mar 2007
Posts: 3,285
West Coast, USA
jbc426
master
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master
Joined: Mar 2007
Posts: 3,285
West Coast, USA
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Quote:
wrong flex plate. The flexplate i used on my 360/380 crate motor was like the bottom one shown in the pic that jbc426 posted; round with a big scallop taken out, I think it was a Mr. Gasket piece though, and no weights on the converter.
Sometimes in this hobby, you have to take two steps backwards to be able to take another step forward. It goes with the territory and makes final victory that much sweeter!I know we all go through our struggles in the quest to enjoy old Mopars.
The pics are straight out of the Summit on-line catalog. Let us know how it works out.
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's
1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
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Re: Please, please help with vibration problem
[Re: larrymopar360]
#931065
03/10/11 05:25 PM
03/10/11 05:25 PM
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Joined: Jan 2011
Posts: 15,902
Central Florida
larrymopar360
OP
Stud Muffin
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OP
Stud Muffin
Joined: Jan 2011
Posts: 15,902
Central Florida
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What next???? Mechanic replaced flexplate with BM "scalloped" flexplate and removed the weight from the converter, but no change! Even parked, in Park or Nuetral, has soon as rpm's are brought up to about 2K, it vibrates badly.The hardest thing to figure is it did the exact same thing with the old 318/904 combination.Everything other than accessories are new.I disconnected all the belts and it still shakes at 2K.I really don't know what to do next.Out of money and patience.Right now I have an $8000 boat anchor that I can't drive without getting very annoyed and frustrated.
Facts are stubborn things.
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Re: Please, please help with vibration problem
[Re: larrymopar360]
#931066
03/10/11 05:36 PM
03/10/11 05:36 PM
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Joined: May 2003
Posts: 15,487
Florida
scratchnfotraction
I Live Here
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I Live Here
Joined: May 2003
Posts: 15,487
Florida
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check to make sure the front damper has not sliped on the rubber and is off balance make sure its for a 360 also either you have a mechanical failure/problem or its mixed on the balanced parts is my guess 
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Re: Please, please help with vibration problem
[Re: HYPER8oSoNic]
#931070
03/10/11 11:46 PM
03/10/11 11:46 PM
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Joined: Jan 2003
Posts: 4,244
West Virginia
NewbombTurkk
master
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master
Joined: Jan 2003
Posts: 4,244
West Virginia
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he says it did the same thing with the old 318/904.....so it is NOT a new 360 problem right?
1969 Buick Sportwagon 455 Stage 1 Ram Air SOLD
Nationwise Auto Parts Alumni 1982-1984
Now 1972 El Camino, original 402
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Re: Please, please help with vibration problem
[Re: mcmopars]
#931074
03/11/11 03:25 PM
03/11/11 03:25 PM
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Joined: Jan 2011
Posts: 15,902
Central Florida
larrymopar360
OP
Stud Muffin
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OP
Stud Muffin
Joined: Jan 2011
Posts: 15,902
Central Florida
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Everything is new, including trans, electronic ignition, etc.Damper is one that came with the Mopar Performance motor.I guess that would be the easiest thing to replace right now, but I really don't think they built this with the wrong component.It is not any accessories because I already removed all the belts and it still vibrates. I will try a different ballast resistor, as suggested, what the heck, it is easiest enough. Everything else is new, including coil. It is so baffling, because it did this with the old motor, trans, converter, etc.
Facts are stubborn things.
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Re: Please, please help with vibration problem
[Re: larrymopar360]
#931075
03/11/11 06:34 PM
03/11/11 06:34 PM
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Joined: May 2003
Posts: 15,487
Florida
scratchnfotraction
I Live Here
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I Live Here
Joined: May 2003
Posts: 15,487
Florida
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check the timing then i have seen them so far advanced it souded like it had a choppy cam in it way over advanced will shake and ping under med load  if its a mag engine and your mixing the la stuff with it it could be off on the balance maybe its a premag bottom end and you have added magnum balance stuff but then again i dodnt see how the other engine did this also very interesting in deed 
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Re: Please, please help with vibration problem
[Re: scratchnfotraction]
#931076
03/11/11 08:03 PM
03/11/11 08:03 PM
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Joined: May 2009
Posts: 62
montreal, quebec,canada
7e5dartsport
member
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member
Joined: May 2009
Posts: 62
montreal, quebec,canada
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what if the choke wasnt opening . engine would run very rough as it gets hot ??? also, there may be more than one weigth on the converter , you guys removed only one ??? good luck
fully legal sounds the same as full illegal...
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Re: Please, please help with vibration problem
[Re: 7e5dartsport]
#931078
03/12/11 12:36 AM
03/12/11 12:36 AM
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Joined: Jan 2011
Posts: 15,902
Central Florida
larrymopar360
OP
Stud Muffin
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OP
Stud Muffin
Joined: Jan 2011
Posts: 15,902
Central Florida
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Quote:
also i would check the firing order because cylinders number 5 and 7 are too easy to mix-up. on another note, one cylinder may not be firing. to check it: with the engine running remove the wire from the spark plug and slowly take the wire away from the plug. you should hear it ignite and as you take the wire away the engine will sligthly slow down, if everything is fine with that cylinder. if the engine doesnt slow down, there is something wrong with that cylinder. put the wire back on the plug and repeat for all cylinders. there are special pliers to do this so you dont get shocked from the ignition. 
They are easy to mix up, I've done it,but they are correct now.This vibration is not constant, like when there is a bad plug wire. It is harmonic in nature, most noticable at about 45 mph, but also while parked in N or P, once the rpm are brought up to about 2000.Today I removed the poly trans mount and installed a OEM one.Helped alot, but still noticable harmonic vibration around 45mph.I have heard from a couple others who have installed these and have no problems.I had the poly one on my old motor and trans, and same deal, so I removed it and put on OEM one.Is the rubber mount just masking a problem? Again, what baffles me most is that I had the same issue with old motor, trans, torque converter set up.Exactly the same. 
Facts are stubborn things.
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Re: Please, please help with vibration problem
[Re: scratchnfotraction]
#931079
03/12/11 12:42 AM
03/12/11 12:42 AM
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Joined: Jan 2011
Posts: 15,902
Central Florida
larrymopar360
OP
Stud Muffin
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OP
Stud Muffin
Joined: Jan 2011
Posts: 15,902
Central Florida
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Quote:
check the timing then
i have seen them so far advanced it souded like it had a choppy cam in it
way over advanced will shake and ping under med load
if its a mag engine and your mixing the la stuff with it it could be off on the balance
maybe its a premag bottom end and you have added magnum balance stuff
but then again i dodnt see how the other engine did this also
very interesting in deed
It idles nice and smooth, and timing is set pretty middle of the road right now.It doesn't misfire, hesitate, or ping.It just vibrates when on the gas at around 35mph and a little worse around 45mph, but smoothes when you speed up or slow down.No LA parts where mixed with this motor.It is a Mopar Performance 360, with all new parts and complete.I just added viscous fan, carb, headers, and fuel pump. I did remove all the belts for just a minute to see if it was one of the accessories, but it still vibrated.Removing the poly trans mount helped alot, but still some harmonic vibration.Thx.
Facts are stubborn things.
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