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pramodkotwal(at)yahoo.com
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 Posted: Thu Mar 20, 2008 8:25 am Post subject: Corvair 5th bearing ... Nitriding |
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Nitriding
Nitrogen is diffused into the metal matrix during nitriding.
This introduces compressive stresses in the area where the nitrogen is diffused.
The depth of this diffusion zone is generally referred to as case depth.
The compressive stresses oppose the bending stresses at the opposing end and lower the resulting stresses.
Fatigue strength is the ability of a part to withstand bending stresses over a number of load cycles.
Lowering bending stresses increases the number of load cycles that a part can withstand.
Remember that these load cycles are cumulative over the life of a part.
Nitriding can achieve only a limited increase of the number of survivable load cycles if the loads are very high and if the part has already experienced a large number of load cycles under heavy loads.
A fifth bearing will eliminate deflections of the crankshaft but it will not reduce the bending force exerted by the connecting rod. So the bending stresses will not be lowered. Hence the contribution of the fifth bearing towards increasing the fatigue strength of a crankshaft remains to be seen. A crankshaft with a larger cross section is a better solution.
In my opinion, a fifth bearing is a feel good solution if you are trying to increase the fatigue strength.
Pramod Kotwal
Nitron, Inc.
kevinbonds(at)comcast.net wrote:[quote] --> Zenith-List message posted by: kevinbonds(at)comcast.net
I should have mentioned I am not an expert on this subject (or any other for that matter). I was just paraphrasing what I remember about a paper I read on the subject. I tried to find that paper for you, but could not.
Kevin Bonds
-------------- Original message ----------------------
From: "ashontz" Be a better friend, newshound, and [quote][b]
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Kevin Bonds
Joined: 09 Jan 2006
Posts: 171
Location: Nashville, Tn
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| Posted: Thu Mar 20, 2008 5:47 pm Post subject: Corvair 5th bearing ... Nitriding |
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_________________
KevinBonds
Nashville, TN
Plans-building Zenith CH601XL w/Corvair Power
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planecrazydld(at)yahoo.co
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| Posted: Fri Mar 21, 2008 3:15 am Post subject: Corvair 5th bearing ... Nitriding |
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Pramod;
Is there room in the case to increase the main journal diameter? Such as would be possible with a billet crank? How much larger?
Thanks.
Pramod Kotwal <pramodkotwal(at)yahoo.com> wrote:[quote] Nitriding
Nitrogen is diffused into the metal matrix during nitriding.
This introduces compressive stresses in the area where the nitrogen is diffused.
The depth of this diffusion zone is generally referred to as case depth.
The compressive stresses oppose the bending stresses at the opposing end and lower the resulting stresses.
Fatigue strength is the ability of a part to withstand bending stresses over a number of load cycles.
Lowering bending stresses increases the number of load cycles that a part can withstand.
Remember that these load cycles are cumulative over the life of a part.
Nitriding can achieve only a limited increase of the number of survivable load cycles if the loads are very high and if the part has already experienced a large number of load cycles under heavy loads.
A fifth bearing will eliminate deflections of the crankshaft but it will not reduce the bending force exerted by the connecting rod. So the bending stresses will not be lowered. Hence the contribution of the fifth bearing towards increasing the fatigue strength of a crankshaft remains to be seen. A crankshaft with a larger cross section is a better solution.
In my opinion, a fifth bearing is a feel good solution if you are trying to increase the fatigue strength.
Pramod Kotwal
Nitron, Inc.
kevinbonds(at)comcast.net wrote:[quote] --> Zenith-List message posted by: [quote][b]
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