440 bearings
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Hemirunner
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There's a lot more to affect oil pressure than just the main bearings. They only pass oil on to the rods. I use the 3/4 groove MS2233HG's in most of my strokers.
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Just my two cents, but I would use half-grooved mains because the bearings have 30% more load carrying capacity. All of the force on the crank is down on the caps during acceleration, and the bottom bearings take this load.The oil film is what actually is carrying the load, and transferring the force and the heat to the cap.
moper
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I use 1/2 groove on most builds, 3/4 if it's going to be revved higher or steady higher rpms. IMO there's not much of a need for full groove.
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I see what you mean about the half-grooved bearings! I bought mine about ten years ago when they were plentiful. I'll be darned if I can find a set now. I do likethe 3/4 groove though! They have a trick coating on them too.
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Gentlemen,
I use full groove mains. I like Clevite 77 or TRW, the bearings are"tri-metal" (steel backing with a copper-tin overlay babbit) construction. I run clearances at 0.0015 to 0.002 max measured with calipers (not plastiguage). I buy 2 sets of mains and discard the bottom of each set. You may need to file off the tang of the insert used on the bottom half. I also torque the main cap 15 lb/ ft more than called for to insure the bearing will not spin. I use ARP bolts on main caps and rods. The full groove mains allow for 360 degree oiling of the rod bearings for rotation of the crank. I always use a HIGH VOLUME oil pump and 10W - 30 Mobil 1oil. This setup provided better lubrication (load carrying and cooling) of the rods and mains. The term is called Hydrodynamic wedge, where the rotating member actually "floats" on the oil film. Google hydrodynamic oiling to better understand the principal. I also run the oil level 1/2 quart over the full mark.....when the stick shows full, I add a 1/2 guart. I also use the windage
tray also. But, this is just my way of doing it.....other guys have their own way.....which is a better way???? Its a personal philosophy.....
Cheers,
RJ Renton
I use full groove mains. I like Clevite 77 or TRW, the bearings are"tri-metal" (steel backing with a copper-tin overlay babbit) construction. I run clearances at 0.0015 to 0.002 max measured with calipers (not plastiguage). I buy 2 sets of mains and discard the bottom of each set. You may need to file off the tang of the insert used on the bottom half. I also torque the main cap 15 lb/ ft more than called for to insure the bearing will not spin. I use ARP bolts on main caps and rods. The full groove mains allow for 360 degree oiling of the rod bearings for rotation of the crank. I always use a HIGH VOLUME oil pump and 10W - 30 Mobil 1oil. This setup provided better lubrication (load carrying and cooling) of the rods and mains. The term is called Hydrodynamic wedge, where the rotating member actually "floats" on the oil film. Google hydrodynamic oiling to better understand the principal. I also run the oil level 1/2 quart over the full mark.....when the stick shows full, I add a 1/2 guart. I also use the windage
tray also. But, this is just my way of doing it.....other guys have their own way.....which is a better way???? Its a personal philosophy.....
Cheers,
RJ Renton
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