Hydra-Rev kits...
#24
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Well as someone who actually has one in one of my hydraulic roller engines what they are designed to do is allow you to run less stiff valve springs which reduce your seat and open pressure which helps keep you from collapsing the plunger in the hydraulic roller lifters when running a big hr cam. Unlike a solid roller lifter which usually run 200# on the seat a hydraulic roller lifter plunger will collapse under those kind of spring pressues. The hydra rev kit adds additional pressure to the lifter body instead of the plunger to keep from floating the valves.
#25
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Well as someone who actually has one in one of my hydraulic roller engines what they are designed to do is allow you to run less stiff valve springs which reduce your seat and open pressure which helps keep you from collapsing the plunger in the hydraulic roller lifters when running a big hr cam. Unlike a solid roller lifter which usually run 200# on the seat a hydraulic roller lifter plunger will collapse under those kind of spring pressues. The hydra rev kit adds additional pressure to the lifter body instead of the plunger to keep from floating the valves.
#26
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Have seen a rev kit or two kill an engine by eating into the aluminum head and sending flakes into the oil.
I see both sides of this argument. Personally being the poor guy I am I would say spent $100 extra on better pushrods and springs for insurace against breakage. Cheaper than a rev kit.
With modern springs we get away with a lot of things on hydraulic lifters we could not a few years back.
I see both sides of this argument. Personally being the poor guy I am I would say spent $100 extra on better pushrods and springs for insurace against breakage. Cheaper than a rev kit.
With modern springs we get away with a lot of things on hydraulic lifters we could not a few years back.