con rod balancing Q
#2872171
01/10/21 04:55 PM
01/10/21 04:55 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
OP
Circle Track
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OP
Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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I saw a utube vid & in one of the Mopar books that you (1) grind on the big end till all the weighed big ends are equal then (2) lay the whole rod on the scale & weigh it & grind on the small end till the whole rod weights are all equal (within 1/2-1 gram) & you are set. then I see another vid from a speed shop & they equalize the big end weights then they equalize the small end weights & you are set. what is right here? thank you for your time.
live every 24 hour block of time like it's your last day on earth
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Re: con rod balancing Q
[Re: RapidRobert]
#2872200
01/10/21 06:23 PM
01/10/21 06:23 PM
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Joined: Oct 2007
Posts: 4,205 New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,205
New York
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When balancing ends, the subject end must be on the scale, a line through both pin and journal centers must be horizontal, and the opposite end suspended (weightless). Unless the same process is used on both ends, the exact point where metal is removed may add an error.
Boffin Emeritus
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Re: con rod balancing Q
[Re: Cab_Burge]
#2872263
01/10/21 09:11 PM
01/10/21 09:11 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
OP
Circle Track
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OP
Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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the 1st vid & the book had it: big end on the scale, horizontle of course,other end suspended & grind on the big ends till the big ends are equal (1/2-1 gram) on all of em then lay the whole rod on the scale & grind on the small end till the whole rod on the scale weights are equal (1/2-1 gram) DONE. then I saw that vid from a speed shop out west & the equalized all the big ends (within 1/2-1 gram I would assume) then equalized all the small ends (within 1/2-1 gram I would assume) DONE. that's as far as I could grasp.
live every 24 hour block of time like it's your last day on earth
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Re: con rod balancing Q
[Re: RapidRobert]
#2872321
01/10/21 11:05 PM
01/10/21 11:05 PM
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Joined: May 2009
Posts: 511 Temperance, MI
68 HEMI GTS
mopar
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mopar
Joined: May 2009
Posts: 511
Temperance, MI
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I always balanced the big end on a fixture, then you know to equalize the rod the rest needs to come off the small end. It’s not like your gonna grind on the beam. So yes, balance the big end on fixture and then you can weigh the whole rod to balance the small end. I only did hundreds of engines that way though so.... Internet experts are king
68 Dart GTS "HEMI" 10.30 @ 131 pump gas street car 3780# 69 Roadrunner 511 six pack 10.92 drive to track street car
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Re: con rod balancing Q
[Re: cudaman1969]
#2872325
01/10/21 11:18 PM
01/10/21 11:18 PM
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Joined: Aug 2009
Posts: 2,037 Mooresburg, Tn
'72CudaRacer
top fuel
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top fuel
Joined: Aug 2009
Posts: 2,037
Mooresburg, Tn
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Kinda hard to do on a stock Hemi rod or say an Eagle rod with the rounded top. Actually, it's quite easy to remove material from the rounded small end. It's not like you 're gonna grind a lot off of it. If it's that far off, something is BAD wrong. Brian
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Re: con rod balancing Q
[Re: 68 HEMI GTS]
#2872377
01/11/21 03:53 AM
01/11/21 03:53 AM
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Joined: Aug 2003
Posts: 43,096 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,096
Bend,OR USA
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Did you use a shadow graph to hold the ends up off the scale when switching them around to weigh each end?
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: con rod balancing Q
[Re: Cab_Burge]
#2872891
01/11/21 10:19 PM
01/11/21 10:19 PM
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Joined: Feb 2016
Posts: 199 PA
Scully
member
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member
Joined: Feb 2016
Posts: 199
PA
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Did you use a shadow graph to hold the ends up off the scale when switching them around to weigh each end? I use my shadow graph for setting up the bob weights, the rods are easier to do on a small digital scale.
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