enginehistory.org

[jwells]

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.

[rwahlgren]

[rwahlgren]

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


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

[rwahlgren]

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.

[kmccutcheon]