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There are 4 basic types of bypass filters.
HEPO MICRO-BYPASS FILTRATION
SUPERIOR PATENTED DESIGN ADVANTAGES
Surface and Depth Filtration
Limited Loading
HEPO's Patented Design
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HEPO Bypass Filter Elements
EFS-60F, EPS-10F, EPS-20F
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Surface & Depth Filtration:
HEPO employs a method of both "surface" and "depth" filtration - achieved by winding a specially blended yarn of cotton and cellulose in a precise diagonal pattern around a perforated center tube.
Oil Pathways:
The HEPO element features many hundreds of identical, tapered (decreasing in size), spiral passageways that trap successively smaller particles as oil flows inward toward the center core.
Superior Structural Integrity:
Integrity is created and maintained by locking the combed fibers of the filter in place with each successive layer of winding. Designed to hold up to the combination of heat, pressure and loading of oil contamination.
Far Less Make Up Oil Required:
HEPO allows you to truly save money by extending your drain interval without the need for significant make-up oil or added oil capacity in the filter housing. HEPO works by filtering the oil and keeping it virtually contaminate free. The HEPO housing was designed specifically to house the filter element, not as an extra oil sump. Our claims of cost savings are realized in the entirety.
Installation With Standard Parts:
No other bypass filtration system currently available can compare to HEPO. Required installation parts (standard NPT fittings) vary by engine type, but are widely available at any parts store.
HEPO Superior Filtration & Efficiency:
HEPO provides a specifically engineered system of filtration and filter elements that were designed for the task of filtering oil to 1 micron. HEPO’s simple elegant engineering and HEPO's patented high efficiency element is guaranteed to deliver both reliability and performance. Our patented design provides excellent performance without adding unnecessary complexity.
No Electricity Required
No Mounting Restrictions:
Unit is fully pressurized and can be mounted at any orientation.
Lifetime Warranty
Condensation Removal:
Up to 100cc of condensation water.
Consistent Filtration:
Low engine speed or stop-start driving conditions do not decrease filtration performance.
No Rotating Components
No Service Required:
Only replacement required at service is simple changing of filter o-ring.
No Compressed Air Required:
Unit does not contain a complex flow control valve.
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ROLLED PAPER
Oil flows axially (lengthwise) through the roll. Typically these filters fall into two categories:
- High-quality rolled filter paper, wound on a central core, fit tightly into a cylindrical container
- Commercially available toilet paper or paper towel rolls, inserted into a cylindrical container
Rolled Paper Filter
Danger of Loading and Channeling |
Before & After |
ADVANTAGE
Inexpensive
DISADVANTAGES
- Loading - filter blockage from contaminants building up at the end of the roll which is first exposed to oil flow.
- Channeling - as the filter becomes filled with oil and the structural integrity of the media starts to weaken the oil finds the route of least resistence. This is known as "channeling" or "worm lines".
- Limited to "Surface" Filtration - an inability to trap particles of successively smaller size.
- Poor Structural Integrity - lack of strength between layers exposes filters to channeling (discussed above) which eliminates filter effectiveness.
- Costly Make-Up Oil Additions - bypass filtration systems featuring rolled paper filters require more frequent element changes than an HEPO Bypass System. They are also much larger in size comparison to HEPO, and in effect create an extra sump of oil that is changed every time the roll of paper is changed. This results in significant make-up oil requirements. Some models require 15-30% of the sump capacity of the engine in new make-up oil with each filter element change. In effect, each element change is a partial oil change. This constant dilution of the dirty oil with new clean oil produces good oil analysis reports and gives the illusion that the filter is working. The cost to the owner/operator is much higher than when using HEPO.
- System Cost - rolled filter bypass systems typically cost from $300 to $550 with replacement cartridges costing between $20 - $70.
- Filter Element Replacement Cost - Yes a roll of toilet paper or a roll of paper towels is cheaper than a HEPO element. But these items were not designed or manufactured to be oil filters. Because the total cost of the oil change includes labor, oil, waste disposal issues and the element cost, there is no reason why you should use a common roll of paper towels or toilet paper to filter your oil and protect your expensive engine.
- Tissue Manufacturers Do Not Design These Rolls with the necessary tension and dimensional control required to be a filter. Simply put, it is not recommended to utilize a product for something other than its original purpose.
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OIL REFINER (Heating Element Bypass Filters)
How These Types of Filters Work
Some bypass filters feature a heated chamber, also known as an evaporation chamber or plenum chamber. In this design, oil first travels through the filter’s medium, and then enters the evaporation chamber where it is heated to 190º-200º. Manufacturers of this type of system “theorize” that heating the oil to this level will “flash off” water and fuel in the oil. They represent the product as being an “oil refiner”. This is simply not true. These filters are not oil refiners by any definition. The process of oil refining does not occur within any of these style filter products.
Problems with Oil Refiner (Heating Element Bypass Filters)
Increased Cost and Complexity – Hepo believes that the heated chamber feature increases cost without increasing performance. Why?
- 200° is not a high enough temperature to boil-off water and/or coolant.
- Oil temperatures climb to 190°-200° in any engine that is run for 30 minutes or longer.
Electricity Required – to power the heating element.
Mounting Restrictions – may apply to accommodate return oil flow by gravity.
Limited Lifespan of Product – typically these units carry a 10-year warranty on the bypass filter system and a 5-year warranty on the filter’s heating element.
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CENTRIFUGE STYLE BYPASS FILTERS
This type of device is really a centrifugal separator, not a filter. Centrifuge designs feature a non-pressurized housing that contains a rapidly spinning basket. The spinning basket is driven by a turbine that is powered by the pressurized oil flowing through the engine. Particles, via centrifugal force, are separated from the oil and flung to the wall of the basket where they adhere and build up.
Problems with Centrifuge Style Bypass Filters
Inability to Separate Water from Engine Oil.
Loss of Filtration Efficiency – when operating at low engine speed or in stop-start driving conditions.
Cleaning of Rotating Components – disassembly required.
Bearing and Seal Replacement – periodically required.
Mounting Restrictions – may apply to accommodate return oil flow by gravity.
Compressed Air Required – necessary to operate the flow control valve.
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