Endurance Lobes (EPS lobes) from Engine Power Systems
State of The Art Lobe Design For The LSX Engine. Here is the Evolution:
In the beginning days of LSX Performance Cams, most lobe profiles were based off of designs for the Small Block Chevy and Ford. Due to the smaller camshaft base circle of these older engine designs, it wasn’t possible to build much acceleration into the cam lobes without losing control. While these lobes generally were quiet and easy on parts they definitely were lacking power and drivability with the LSX Engine Design.
Power with Drivability:
After much research it was discovered that due to the larger base circle of the LSX Engine it was possible to utilize cam lobes with much higher rates of acceleration than previously possible with older engine designs. Once this discovery was made, it led to the development of cam lobe profiles that made incredible power with very good drivability for their size. Probably one of the most noted cams ever done for the original LS1 Engine is the TR224 which has been the benchmark in lobe design from which most other LSX cams have been copied or derived from.
While these cam lobes, with fast acceleration, make incredible power and offer good drivability for their size, the performance has always had a price. Most LSX Engines with these types of cams exhibit ‘sewing machine’ noise from the valvetrain due to the fast ramps on these cams. Also, in order to control these lobes at high rpm, these lobe designs took quite a bit more spring pressure to maintain control as compared to older, slower lobe designs. Coupled with higher springs pressure has also been the issue of shorter spring life than with a milder lobe design.
EPS Cam Lobes are different. Most other ‘catalog’ lobes are based off of designs that are at least 10 years old. EPS Lobes are a modern design, that takes full advantage of all of the latest lobe design techniques that weren’t available 10 years ago. Most ‘catalog’ lobes, that other vendors use, have quick acceleration characteristics, but coupled with that, they also have poor jerk characteristics. Jerk is the rate of change of acceleration. In simple terms, while these other lobe designs accelerate quickly, they don’t do it in a smooth or controlled manner. EPS Lobes are able to accelerate at a rate that is comparable to or faster than most other ‘catalog’ lobes, but maintain excellent jerk characteristics. This means smooth acceleration, which translates into less stress on valvetrain components, less spring pressure needed for control, and reduced noise.
More power with better street manners, reduced stress on valvetrain components, plus reduced noise underhood. The Endurance lobes from Engine Power Systems offer the enthusiast many, many advantages over ‘catalog’ lobes.