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in Popular Hot rodding.
Basically the gist of the article said that while roller do reduce friction they increase side loading of the lifter to a large degree. This causes the cases to warp and bleed down at much faster rates, thus robbing a potetial for lossed horsepower on the top end. The also said that hydraulic tappets do better with smaller duration camshafts since they are able to ramp up faster within the first 10 degrees or so. While as rollers take longer to reach higher lift initially. Cams that are 270 degrees or more see more lift with rollers than hydraulic tappets. They also stated that since they ramp slower they can take more duration than a standard lifter. They also stated because of better machining hydaulics and solid rollers where nearly identical in horsepower.They effectively see less lope and build better vacuum. So one of my questions is; If a standard engine can pass smog with about 209 degrees of duration will a roller be able to handle more and still pass emmisions at idle? Can I run solid rollers with an adjustable rocker?Will aftermarket roller lifters give me more top end power and be more stable in the valvetrain? The article went on to talk about conical springs. Apparently they require less pressure than conventional springs so putting in a high pound conical spring will offer not benefits and may reduce horsepower. Anyhow, just giving some thoughts for a discussion perhaps.
Basically the gist of the article said that while roller do reduce friction they increase side loading of the lifter to a large degree. This causes the cases to warp and bleed down at much faster rates, thus robbing a potetial for lossed horsepower on the top end. The also said that hydraulic tappets do better with smaller duration camshafts since they are able to ramp up faster within the first 10 degrees or so. While as rollers take longer to reach higher lift initially. Cams that are 270 degrees or more see more lift with rollers than hydraulic tappets. They also stated that since they ramp slower they can take more duration than a standard lifter. They also stated because of better machining hydaulics and solid rollers where nearly identical in horsepower.They effectively see less lope and build better vacuum. So one of my questions is; If a standard engine can pass smog with about 209 degrees of duration will a roller be able to handle more and still pass emmisions at idle? Can I run solid rollers with an adjustable rocker?Will aftermarket roller lifters give me more top end power and be more stable in the valvetrain? The article went on to talk about conical springs. Apparently they require less pressure than conventional springs so putting in a high pound conical spring will offer not benefits and may reduce horsepower. Anyhow, just giving some thoughts for a discussion perhaps.
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