oil pump questions
03-01-2007, 11:50 AM
#1
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oil pump questions
Anybody have any links or pics of the inside(hopefully w/text) of the oil pump? I heard something about GM white springs helping with the oil pump's efficiency. The oil pumps I was familiar with consistended of just two gears, basically. Can anyone show me where it sits in the engine as well as the oil travel through the lifter valley? Thanks!
03-01-2007, 12:12 PM
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The pump sits at the rear of the block, driven off a shaft perpendicular to the end of the cam.
The pump is simply two rotating gears, but there is a pressure relief spring in the body of the pump, to prevent the pump from developing excessive pressure and shearing off the drive mechanism. The stock spring relieves the pressure at 60psi, adequate for most moderately modified engines. The "white" spring relieves at 80psi, allowing for more pressure on high revving, high output engines. It doesn't change the efficiency of the pump, it just allows it to build a higher pressure.
The pump is simply two rotating gears, but there is a pressure relief spring in the body of the pump, to prevent the pump from developing excessive pressure and shearing off the drive mechanism. The stock spring relieves the pressure at 60psi, adequate for most moderately modified engines. The "white" spring relieves at 80psi, allowing for more pressure on high revving, high output engines. It doesn't change the efficiency of the pump, it just allows it to build a higher pressure.
Last edited by Injuneer; 03-01-2007 at 12:25 PM.
03-01-2007, 02:33 PM
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an animation of that would be nice
the oil is picked up from the sump by the oil pump pick up in the back of the engine block, the oil is sent from the oil pump to the main thrust bearing but it is bypassed first to the oil filter
the oil goes straight up to the main oil gallery, which runs parallel to the camshaft
at each cam bearing the oil travels down through passages to each cam bearing, an annular groove behind each cam bearing allow the oil to flow to the lifter galleries, it oils the lifters, sends oil through the pushrods and dribbles on the rocker arms and the falls back down to the sump
when looking at the camshaft, the main oil gallery sits at 12 o clock, the lifter galleries sit at 10 and 2
at the 6 o clock position are passages from each cam bearing to each main bearing
at each main bearing the oil travels through chameferd holes in the crank to each connecting rod
i dont remember how the piston rings and wrist pins get oil
if someone could fill in that blank that would be nice
the oil is picked up from the sump by the oil pump pick up in the back of the engine block, the oil is sent from the oil pump to the main thrust bearing but it is bypassed first to the oil filter
the oil goes straight up to the main oil gallery, which runs parallel to the camshaft
at each cam bearing the oil travels down through passages to each cam bearing, an annular groove behind each cam bearing allow the oil to flow to the lifter galleries, it oils the lifters, sends oil through the pushrods and dribbles on the rocker arms and the falls back down to the sump
when looking at the camshaft, the main oil gallery sits at 12 o clock, the lifter galleries sit at 10 and 2
at the 6 o clock position are passages from each cam bearing to each main bearing
at each main bearing the oil travels through chameferd holes in the crank to each connecting rod
i dont remember how the piston rings and wrist pins get oil
if someone could fill in that blank that would be nice
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