Crankshaft Measurement
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Lee Thompson
New Member
- Joined
- May 24, 2001
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- 3,184
not exact but close
mains---2.500
rods----2.250
mains---2.500
rods----2.250
Jerryl
Tall Unvaccinated Chinese Guy
- Joined
- Dec 14, 2004
- Messages
- 9,644
Lee is right on the $$$. 
Main Bearing Journal Diameter 2.4995 in
Crankpin Journal Diameter 2.2487 in.- 2.2495 in
Factory Engine Specification
Main Bearing Journal Diameter 2.4995 in
Crankpin Journal Diameter 2.2487 in.- 2.2495 in
Factory Engine Specification
I have always wanted to ask this question - with relation to this subject.
In a hypothetical situation, if a crankshaft is cut 0.010" say on the mains - to achieve an ultimate oil clearance of 0.002" - this would be 2.500" - 0.010" = 2.490" for the crankshaft main journal OD.
What would the needed dimension be for the ID of the journal bore w/ bearing intact need to measure for this 0.002" oil clearance dimension?
Would the ID need to be:
Option A ---> 2.490" + 0.002" = 2.492" - this gives 0.001" above & below the journal.
Option B ---> 2.490" + (0.002" * 2) = 2.494" - this gives 0.002" above & below the journal.
I know that it is done the other way around, where the line bore/hone is conducted 1st, the bearings are installed in the cradels & measurements are taken here - and then the crankshaft is cut accordingly, yet, is the difference between the dimensions of the Crankshaft OD & it's corresponding housing w/ bearing 2/1000" or 4/1000" ?
Just curious.
TIA
In a hypothetical situation, if a crankshaft is cut 0.010" say on the mains - to achieve an ultimate oil clearance of 0.002" - this would be 2.500" - 0.010" = 2.490" for the crankshaft main journal OD.
What would the needed dimension be for the ID of the journal bore w/ bearing intact need to measure for this 0.002" oil clearance dimension?
Would the ID need to be:
Option A ---> 2.490" + 0.002" = 2.492" - this gives 0.001" above & below the journal.
Option B ---> 2.490" + (0.002" * 2) = 2.494" - this gives 0.002" above & below the journal.
I know that it is done the other way around, where the line bore/hone is conducted 1st, the bearings are installed in the cradels & measurements are taken here - and then the crankshaft is cut accordingly, yet, is the difference between the dimensions of the Crankshaft OD & it's corresponding housing w/ bearing 2/1000" or 4/1000" ?
Just curious.
TIA
