Help! > Specific Engine Help
Gardner "0" (Alyn Foundry) - crankshaft query
Amblejo1:
Happy New Year to ALL - may it be better than the past one.
I'm just looking at the drawing for the Alyn Foundry Gardner crankshaft - it shows the oil way in the crank pin coming to the surface of the pin on the side nearest to the main shaft.
I'm thinking that if the hole opened onto the opposite side (as shown by the red arrow on the image), centrifugal force would force the oil into the bearing more effectively.
Is my thinking misguided?
Amblejo1:
I seem to be struggling to attach the image.
The file name (a .jpg file of 51KB) is showing in the "Attach:" panel below, but it doesn't seem to be getting through - perhaps the description in words explains my query anyway??
Jo:
--- Quote from: Amblejo1 on January 01, 2021, 01:20:42 PM ---
I'm thinking that if the hole opened onto the opposite side (as shown by the red arrow on the image), centrifugal force would force the oil into the bearing more effectively.
--- End quote ---
Yes that is exactly what would happen. On my Centaur Gas engine the hole is on the outside for just that reason :) .
Jo
Alyn Foundry:
Hello.
This has become quite the " hoary Chestnut " for this component.
Now in its 31st year I've actually forgotten how the original was done. At the time we, Martin and I reasoned that with the oil way facing " inboard " the oil would collect and " film " the crankpin rather than be flung out all over the place.
A notable point is that the original of 1909 vintage has " Babit " White metal mains and big end shells but we drew it with Bronzes as working with White metal is very tricky for the model engineer.
I can ask a few questions with the group to confirm what Gardner " actually " did and get back to you, if that's ok?
My own engine is done this way and has run 1000's of hours. Actually ran out the Bronze shells and crankpin but after changing them to Zinc alloy zero wear has been detected.
Cheers Graham.
Alyn Foundry:
A group member is going to photograph his full size engine that's undergoing restoration at this moment, I'll post the picture later.
As a Post Script to my previous reply I should have mentioned that using Bronze bearings with Steel shafts will naturally wear the Steel component heavily unless " copious " lubrication is available. Since we started using Zinc alloy, many years ago, we've seen little no no wear on either big end or mains.
Another plus is that Zinc alloy melts on the gas kitchen range and can be poured into heated Steel moulds to make nice, gravity diecast components.
Cheers Graham.
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