VIDEO... Crankshaft balancing

(Jim XK140 FHC) #1

Chesman Engineering very helpful today and sorted out the crank balance. Am I right in thinking the new 10" Friction plates use a stronger purple spring? As mine has some age and is not colour coded perhaps it is correct for my car?
I think I have all the bits to rebuild the engine block, so shouldn’t take long !

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(Art Ford) #2

I thought cranks were balanced with bob weights of a percentage of rod assy. weight.

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(Phil.Dobson) #3

the hallowed workshop of Chesmans! its like stepping back in time. great guys. the pattern shop is another world!!

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(Paul Wigton) #4

Based on what I know…yes.

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(Rob Reilly) #5

1961 Factory Tour Video.

From 6:50 to 9:55 is crankshaft balancing.

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(Paul Wigton) #6

I remember a time, when I could pick up a Jag crank like that…:persevere:

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(PeterCrespin) #7

Not in line sixes because they are in perfect primary and secondary balance. As long as the big ends are the same weight it doesn’t matter what percentage / balance factor you choose (including zero).

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(Paul Wigton) #8

Yep: just called my old balance guy, and he confirmed; bobweights on 4s, 0dd-fire V6s, and V10s.

On Harley’s, he just asks, “At what speed d’ya want the handlebars the right size?”

:crazy_face:

Further proof that the XK engine is purrfect, as designed…:grimacing:

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(Art Ford) #9

My twins are BSA or Real Enfield Inners.

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(Art Ford) #10

I remember a time when we didn’t necessarily use safety glasses.

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