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Re: 273 forged crank in a 318, Balancer options please...
[Re: pitbovver]
#482983
09/28/09 08:37 PM
09/28/09 08:37 PM
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Joined: Feb 2009
Posts: 982
W. Sacto CA. USA
phantomx
super stock
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super stock
Joined: Feb 2009
Posts: 982
W. Sacto CA. USA
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Both are internally balanced, should be zero issues.
Travis..
70 GTX project, orig 440-4, 4 spd, track pack, FC7, stripper/street racer special.
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Re: 273 forged crank in a 318, Balancer options please...
[Re: phantomx]
#482984
09/28/09 08:44 PM
09/28/09 08:44 PM
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Joined: Sep 2009
Posts: 36
toledo ohio
pitbovver
OP
member
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OP
member
Joined: Sep 2009
Posts: 36
toledo ohio
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True, Quote:
Both are internally balanced
But I was wondering if there are any issues concerning the rotating assy since the three harmonic balancers which I have on hand are all drilled differently ie balanced. If you line up the woodruff keyway in each balancer the 273 balancer has three holes drilled @ 12 o'clock, similarly one of the two 318 balancers has 3 holes drilled at 9 o'clock and the third has 2 larger holes drilled at 11 and 1 o'clock. Hope this makes sense....
Last edited by pitbovver; 09/28/09 08:56 PM.
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Re: 273 forged crank in a 318, Balancer options please...
[Re: 6T6Cuda]
#482986
09/28/09 09:18 PM
09/28/09 09:18 PM
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Joined: Sep 2007
Posts: 14,889
up yours
Supercuda
About to go away
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About to go away
Joined: Sep 2007
Posts: 14,889
up yours
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I ran a 318 cast crank in a 65 273 for years with no issue. I seem to vaguely remember that the stock 273 had a heavier piston pin. As for the balancer issue, those holes should be there to neutral balance the balancer.
Now wether the crank will be properly balanced with 273 rods and pistons I dunno. But in my case it didn;t appear to be an issue.
They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.
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Re: 273 forged crank in a 318, Balancer options please...
[Re: pitbovver]
#482987
09/28/09 09:22 PM
09/28/09 09:22 PM
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Joined: Jan 2003
Posts: 2,734
Charlotte, NC
446acuda
master
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master
Joined: Jan 2003
Posts: 2,734
Charlotte, NC
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Quote:
True, Quote:
Both are internally balanced
But I was wondering if there are any issues concerning the rotating assy since the three harmonic balancers which I have on hand are all drilled differently ie balanced. If you line up the woodruff keyway in each balancer the 273 balancer has three holes drilled @ 12 o'clock, similarly one of the two 318 balancers has 3 holes drilled at 9 o'clock and the third has 2 larger holes drilled at 11 and 1 o'clock. Hope this makes sense....
Any neutral (aka zero,internal) balance small block balancer can be used on any small block that is interally balanced. The drilled holes in different positions in different balancers are no different than weights required in different positions to balance a tire.
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Re: 273 forged crank in a 318, Balancer options please...
[Re: pitbovver]
#482989
09/28/09 09:25 PM
09/28/09 09:25 PM
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Joined: Sep 2009
Posts: 36
toledo ohio
pitbovver
OP
member
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OP
member
Joined: Sep 2009
Posts: 36
toledo ohio
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Quote:
Any neutral (aka zero,internal) balance small block balancer can be used on any small block that is interally balanced. The drilled holes in different positions in different balancers are no different than weights required in different positions to balance a tire.
Thanks this is what i was looking for. Patience is a virtue....
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Re: 273 forged crank in a 318, Balancer options please...
[Re: cornucopia]
#482991
09/29/09 10:17 AM
09/29/09 10:17 AM
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Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
HotRodDave
I Live Here
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I Live Here
Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
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The holes you are looking at are to dynamically balance those dampers, they are all neutral balanced, like was mentioned those holes are just to balance them to zero like weights on a tire. 273s and 318 cranks are balanced the same, the 273 piston is lighter but inorder to speed up balancing on the line they made the pin heavier to match them all up and one crank fits all. I don't know if you have noticed yet the converter hole in your 273 crank is smaller than the hub on your 318 converter. If you are running a manual trans then disregard this last statement. 
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: 273 forged crank in a 318, Balancer options please...
[Re: MoparforLife]
#482994
09/29/09 05:41 PM
09/29/09 05:41 PM
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Joined: Sep 2004
Posts: 2,093
oberlin, Ohio
Rapid340
top fuel
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top fuel
Joined: Sep 2004
Posts: 2,093
oberlin, Ohio
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I think you may have a problem if you are using a 273 crank in a newer 318 (I think 1973 or newer) because thats when the 318's started getting the heavier 360 rods.
I believe the 273 and 318 cranks do interchange if they are both from earlier motors with light weight rods, because the 273's used a heavier wrist pin to compensate for the lighter piston.
1971 Factory Appearing Duster 340 11.000 @ 122 mph
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Re: 273 forged crank in a 318, Balancer options please...
[Re: classof65]
#482996
09/30/09 12:23 AM
09/30/09 12:23 AM
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Joined: Jan 2003
Posts: 3,505
DFW
mr_340
master
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master
Joined: Jan 2003
Posts: 3,505
DFW
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I think everyone covered the shortcomings. The 318s seemed to switch to the 340/360 rods when they went to a cast crank circa 1971. The 273/early 318 rods were much lighter, looked more like a SB Shivy rod. The balancer shouldn't be a problem with balance. Chrysler did change the timing mark when they went from the cast iron water pump to the aluminum pump around 1970. The converter register will be the biggest problem. That changed somewhere around 1968, so maybe the 1969 273 would be OK but I'd still check it. I seem to recall the early ones are around 1.556" and the newer ones around 1.815" ID. I'd get it balanced anyway. Maybe if it's close they won't charge you full price? 
Floyd Lippencott IV
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Re: 273 forged crank in a 318, Balancer options please...
[Re: mr_340]
#482997
09/30/09 09:43 AM
09/30/09 09:43 AM
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Joined: Jan 2003
Posts: 4,150
lewiston, ID
cornucopia
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Joined: Jan 2003
Posts: 4,150
lewiston, ID
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Quote:
I think everyone covered the shortcomings. The 318s seemed to switch to the 340/360 rods when they went to a cast crank circa 1971. The 273/early 318 rods were much lighter, looked more like a SB Shivy rod.
The balancer shouldn't be a problem with balance. Chrysler did change the timing mark when they went from the cast iron water pump to the aluminum pump around 1970.
The converter register will be the biggest problem. That changed somewhere around 1968, so maybe the 1969 273 would be OK but I'd still check it. I seem to recall the early ones are around 1.556" and the newer ones around 1.815" ID.
I'd get it balanced anyway. Maybe if it's close they won't charge you full price?
went to the cast crank in 1971?? I've never seen anything BUT a cast crank in ANY 318 from '68 on up...
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Re: 273 forged crank in a 318, Balancer options please...
[Re: cornucopia]
#482998
09/30/09 02:24 PM
09/30/09 02:24 PM
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Joined: Jan 2003
Posts: 3,505
DFW
mr_340
master
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master
Joined: Jan 2003
Posts: 3,505
DFW
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I pulled a forged crank out of a 1969 318. It had the small rods. The next newer 318 I had was a 1972 and it had the cast crank and 360 rods. I stopped looking at 318s when I started collecting 340s, so you could be right on the cast cranks coming in earlier. Did the 1968-1971 318s have a cast crank with the larger 360 rods? Since the 360 came out in 1971, I thought they might have changed things over around then as the 340 got the cast crank in 1973.
Floyd Lippencott IV
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Re: 273 forged crank in a 318, Balancer options please...
[Re: mr_340]
#482999
09/30/09 02:49 PM
09/30/09 02:49 PM
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Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
HotRodDave
I Live Here
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I Live Here
Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
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I have pulled apart a bunch of 318s older than 72 an unless they were polys none of them had forged cranks. Just my experiance. Every 273 I have pulled apart had forged cranks as well as every poly.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: 273 forged crank in a 318, Balancer options please...
[Re: HotRodDave]
#483000
10/01/09 01:43 PM
10/01/09 01:43 PM
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Joined: Sep 2007
Posts: 576
Escondido, CA
kick_the_reverb
mopar
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mopar
Joined: Sep 2007
Posts: 576
Escondido, CA
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2 out ot 3 (or was it 3 out of 4) early 318s I took apart had forged cranks.
Ran
"Hey mister, something's wrong with your car, it idles roughly" - number one comment I got in Israel when daily driving a 70 Barracuda with a lopey cam.
Currently working on - 1966 Dodge A100 van 318/auto
Finally - disc brakes on the front.
In the plans - rear disc brakes, B&M 250 blower
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