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ALLISON V-1710 CRANKSHAFT

 
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jwells



Joined: 16 Sep 2003
Posts: 56
Location: Victoria, AUSTRALIA

PostPosted: Sun Jun 03, 2012 23:43    Post subject: ALLISON V-1710 CRANKSHAFT Reply with quote

Can anyone supply me with a picture(s) or drawing(s) of the 12 counterweight crankshaft that was used in the late model V-1710 engines?

These cranks had the counterweights cast integral with the rest of the shaft and they were unusual in that they were skewed at an angle to the crankcheeks, thus giving them an odd shape.

The only photo I have is in the SAE paper by Dim Gerdan on the Allison but the picture is very small and blurred by the photocoping process.
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rwahlgren



Joined: 15 Aug 2003
Posts: 321

PostPosted: Sun Dec 27, 2020 20:57    Post subject: Re: ALLISON V-1710 CRANKSHAFT Reply with quote

jwells wrote:
Can anyone supply me with a picture(s) or drawing(s) of the 12 counterweight crankshaft that was used in the late model V-1710 engines?

These cranks had the counterweights cast integral with the rest of the shaft and they were unusual in that they were skewed at an angle to the crankcheeks, thus giving them an odd shape.

The only photo I have is in the SAE paper by Dim Gerdan on the Allison but the picture is very small and blurred by the photocoping process.


They were not cast. Forged and unless something was changed, the info I have is the counter weights were welded on. Personally I think not a good idea on an aircraft engine crankshaft.
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rwahlgren



Joined: 15 Aug 2003
Posts: 321

PostPosted: Tue Dec 29, 2020 14:54    Post subject: Reply with quote

http://www.enginehistory.org/members/AllisonV-1710.php


Scroll to topic "Cylinder Blocks" 2nd paragraph, and see crankshaft.
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rwahlgren



Joined: 15 Aug 2003
Posts: 321

PostPosted: Tue Jan 26, 2021 02:00    Post subject: Reply with quote

So now I am confused?

http://www.enginehistory.org/Piston/Allison/AllisonCW/AllisonCW.shtml

Using twelve relatively short balance weights enabled the counterweights to be cast integrally with the rest of the shaft resulting in a stronger finished component.

CAST and integral not welded?

I don't think there was any high performance American aircraft WW2 engine
that used a CAST crankshaft, all were forged.

This is from a Factory publication.
http://www.enginehistory.org/phpbb/viewtopic.php?t=1027
The above must be the old model not using the newer crankshaft.
It is possible the newer crankshaft mentioned has nonwelded weights.


The RR Trust Allison crank info needs some checking into for accuracy.
I still question a CAST crankshaft.
And Fig 3 does not look like a lathe, it looks more like a polishing machine, or what ever, no heavy engine lathe will have bars for ways. Figure 8 you can see that the RH top weight is welded.
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kmccutcheon



Joined: 13 Jul 2003
Posts: 292
Location: Huntsville, Alabama USA

PostPosted: Tue Jan 26, 2021 11:53    Post subject: Reply with quote

Quote:
The R-R Heritage Trust Allison crank info needs some checking into for accuracy.


Dan Whitney is unaware of any cast Allison crankshafts. I have updated the article accordingly.

By the way, Ford planned to use a centrifugally cast crankshaft in the V-1650 GGA it designed.
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