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Veteran
Posts: 164
 
Location: ST. Stephen NB Canada | I have a 55 Dodge Royal with a 270 Hemi. I have been doing some reading over the winter about the potential shortfall of these engines , being the lack of a harmonic balancer. Do any other FL members have any thoughts or advise on this issue. I would like to know if this is a simple fix, & is the end of the crank threaded to accept the HB bolt? Thanks-Garry McGaw |
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Elite Veteran
Posts: 888
Location: Peoples Republic of Oregon | The 241-270 Dodge engines did not have harmonic balancers and many have been found to have cracked crankshafts. The simple fix is to use a balancer from another EarlyHemi engine or just about any A-LA engine. All Mopar v-8 (except for that new-fangled crap) have the same crank snout design so swapping is easy...except for the sheave alignment issue, and to a lesser extent, timing mark location.
If your engine is out of the car it will be easier to check these issues. |
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Expert 5K+
Posts: 8947
  
Location: WHEELING,WV.>>>HOME OF WWVA | the crank would have to be re-balanced with an off the shelf ballancer , correct ? --------------------------------------------------------later |
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Expert 5K+
Posts: 8443
Location: Perth Australia | I wondered that as well, then I thought that the ballancer would be dynamically ballanced for itself and the rubber part is just to take out harmonics, so it wouldnt be nessesary (but might be advisable) to have it ballanced to the rotating mass of the engine?
I am thinking of putting a later 318 balancer on a poly for a future project so I have other crank pully options
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Elite Veteran
Posts: 888
Location: Peoples Republic of Oregon | 60 dart - 2014-01-30 3:29 PM
the crank would have to be re-balanced with an off the shelf ballancer , correct ? --------------------------------------------------------later
Balance should not be affected as all forged crank balancers are the same 'zero' balance condition which is the same 'zero' balance as the stock 241-270 sheave assembly. |
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Expert 5K+
Posts: 9648
Location: So. Cal | Does anyone know if the woodruff keys are the same between the A series, Dodge & Chrysler hemi cranks to make swapping between them very simple? Also, after swapping a dampener to a Dodge that didn't originally have it, what is a good dual groove pulley that can be used on it that lines up with the original system? Anyone done this before?
On the Hot Heads website, the OE style dampener that they sell for the Dodge says that it only works with "pre-'57 timing covers". Would that be the case when swapping an original Chrysler hemi dampener to the Dodge as well?
Edited by Powerflite 2019-06-05 1:46 AM
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Elite Veteran
Posts: 888
Location: Peoples Republic of Oregon | Early engines use a ¼' key, not Woodruff as used on the cam, and newer cranks are 5/16".
The usual fix is to make a stepped key or re-broach the hub.
The other question that accompanies a swap is what sheave to use. Recall that there is a minor difference in hole
locations and one bolt hole needs to be 'slotted'. No big deal. I recommend keeping the sheave diameters close to the original,
for 'that' particular engine, in order to keep the water pump speed in line with oem design.
In years past we have had to modify bottom sheaves to suit applications and were able to 'section' some to get what was needed. |
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Expert 5K+
Posts: 9648
Location: So. Cal | I am referring to using an old Chrysler hemi dampener on a '58 325 Dodge. So it sounds like they use the same key and diameter, with just the timing marks being off. Any idea if there would be a problem with the '57-up timing cover in doing this? I'm not sure if that is more of an issue with putting a 340 style on it, or if there would be the same issue trying to do it with a Chrysler hemi dampener.
I had to look up the word "sheave". I've never heard that before. I would have said pulley. I am hoping that an old Chrysler hemi pulley will work well here. Going to give it a try once I am ready to stop driving my car. I have heard stories of Dodge cranks cracking from the harmonics. That's not something I would like to experience. |
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Elite Veteran
Posts: 888
Location: Peoples Republic of Oregon | The timing indicator is in different locations, Chrysler vs Dodge. All else is the same.
If using an old dampener be sure to be comfortable with the condition of the rubber; remember that these are elgible for social security....
Best to put a hi-viz paint mark across the rubber to each half so that any slippage can be seen. |
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Expert
Posts: 3774
Location: NorCal | wayfarer - 2019-06-05 9:52 AM
Early engines use a ¼' key, not Woodruff as used on the cam, and newer cranks are 5/16".
Every newer crank I've seen has a 3/16" key. |
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Elite Veteran
Posts: 888
Location: Peoples Republic of Oregon | ...darn computer....my keyboard made a mistake.......yes, 3/16 key on post-62 .........
and after 3 days the edit button goes away...someone please explain why that is a good idea.........
Edited by wayfarer 2019-06-08 1:03 PM
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Harmonic Balancer
