Re: The Duchess Project: 1940 Super 8 Convertible Sedan
Posted by Joe Santana On 2017/10/1 9:50:20
Perhaps only another machinist would understand this.
1. Central Cylinder Head in Portland, where the Duchess' engine is being rebuilt, resizes the first connecting rod to what the factory specs are.
2. They mic the crankshaft and put the bearing in the first connecting rod to check the vertical oil clearance.
3. Then they take the rest of the rods to that same housing bore size.
This gives them a range between .0005 - .0025.
Notice they have set these up @ .0015.
They give .001 allowance on crankshafts & connecting rods for size.
This is why they put the bearing in the rod, so they know the exact clearance they want to achieve. No guess work this way.
Finally an amusing observation: A Packard 356 Rod next to a '48 flathead Ford V8 239
Attach file:
(115.56 KB)
(79.92 KB)
(93.17 KB)
(83.32 KB)
(88.18 KB)
(71.14 KB)
1. Central Cylinder Head in Portland, where the Duchess' engine is being rebuilt, resizes the first connecting rod to what the factory specs are.
2. They mic the crankshaft and put the bearing in the first connecting rod to check the vertical oil clearance.
3. Then they take the rest of the rods to that same housing bore size.
This gives them a range between .0005 - .0025.
Notice they have set these up @ .0015.
They give .001 allowance on crankshafts & connecting rods for size.
This is why they put the bearing in the rod, so they know the exact clearance they want to achieve. No guess work this way.
Finally an amusing observation: A Packard 356 Rod next to a '48 flathead Ford V8 239
Attach file:
(115.56 KB)
(79.92 KB)
(93.17 KB)
(83.32 KB)
(88.18 KB)
(71.14 KB)
This Post was from: https://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?post_id=196230