25-11-2019, 08:56 PM
Hi Roger.
The "rod through all the small ends" test will show up bent con rods. But I don't think it confirms they are all definitely the same length.
Say No 1 and No 4 are equal but long and No 2 and No 3 are equal but short. If you look endways on at the crank and rods out of the block, the little end eyes can still be swung into the same line and a rod passed through, but the triangle formed by the rods will not be an equilateral one.
On the other hand, if you reassemble the same rods so that No 1 and No 2 are long and No 3 and No 4 are short, they will form two triangles of different heights. The rod can be passed through No 1 and No 2 but you will find it offset when you attempt to pass it through No 3.
The "rod through all the small ends" test will show up bent con rods. But I don't think it confirms they are all definitely the same length.
Say No 1 and No 4 are equal but long and No 2 and No 3 are equal but short. If you look endways on at the crank and rods out of the block, the little end eyes can still be swung into the same line and a rod passed through, but the triangle formed by the rods will not be an equilateral one.
On the other hand, if you reassemble the same rods so that No 1 and No 2 are long and No 3 and No 4 are short, they will form two triangles of different heights. The rod can be passed through No 1 and No 2 but you will find it offset when you attempt to pass it through No 3.