Engine Oil Flow Measurement – Which Flowmeter?

One of the most difficult flow measures for an automotive engineer is monitoring the flow of engine oil pumped through the system while the car is being driven. When the engine is placed on a test bench and connected to a dynamometer, this process is made substantially simpler due to the increased available area; nevertheless, careful selection and installation of the flow measurement equipment are still required. Furthermore, flow measurement that needs to be obtained in a vehicle’s engine compartment is considerably more challenging because of the instrument power consumption, the installation space required, and the severe conditions beneath the vehicle’s hood.

What other options are available to pick from when it comes to flowmeters? On the other hand, the fact that standards are developed for a certain industry does not always mean that these standards are correct. So let us investigate some other potential outcomes.

(1) The positive displacement meter, a gear meter, a piston meter, or a helical screw are examples of various other possible configurations. It is common for these meters to come with a higher price tag. It is well-known that they generate issues during installation due to the relatively considerable pressure drop they produce. Even though they function quite well throughout a wide range of viscosities, they are prone to meter sliding when the viscosity of the measured liquid is low. Meters are available in many different sizes, but the vast majority of the time, they may be installed in places where flow conditioning is not required. Some engine testing facilities continue to use it even though it is not the optimal choice.

Flow Measurement
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(2) The turbine flow meter is one of the flowmeters that is commonly one of the flowmeters that is used to measure the flow of engine oil and is one of the flowmeters that is used the most widely. This is largely because it is economical and condensed in size. They do not cause excessive damage to the oil system’s operation, and quite a few different manufacturers provide them at a very reasonable price. They have an acceptable pressure drop. However, they are sensitive to oil and fluid flow profile impacts, so it is extremely necessary to calibrate the flow meter over the varied oil viscosity range and with its installed upstream and downstream flow conditioning tubes. Additionally, since they are sensitive to these impacts, it is important to note that they are sensitive to impacts. Therefore, it is necessary to match the installation conditions as nearly as is humanly feasible to obtain accurate results while the system is being utilized. In many instances, specialist flow calibration laboratories will calibrate the flow meter by utilizing the same engine oil, at the same operating temperature, and with the same input and output connections as the engine already installed in the vehicle. In other circumstances, this may be a component of the engine assembly, such as an oil cooler or an oil filter assembly. When it comes to impeding the flow of oil, this region of the engine is typically the part of the machine that poses the fewest obstacles. Regarding engine oils, most flow meter manufacturers only give a calibration certificate for their device when it is used with water. Because of this, errors of a very significant nature are possible.

Flow Measurement
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(3) The third sort of meter is called a Coriolis meter. These are excellent meters with a high degree of precision; nonetheless, they are most suitable for use in installations that are intended to be permanent. These meters continue to have a substantial footprint in addition to their excessively high cost compared to the turbine and positive displacement meters. Even though major improvements have been made to these meters over the previous ten years, they are still prone to measurement errors brought on by incorrect installation, vibration, and zero drift. Because they have a low-pressure drop and a large viscosity rangeability, they are perfect for usage on test benches, where they are permanently installed. Because of this, test benches are where they are most commonly seen. In addition, straight tube types are progressively becoming the standard, which has increased the frequency of their utilization.

Flow Measurement
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(4) The Determination of the Pressure Fall’s Characteristics A method that was gaining in popularity and used to gather exact measurements without affecting the functioning of the oil system as a consequence of the installation of flowmeters is called flow metering without impact. Every engine oil flow system component has its pressure tapping point instrumentation. In addition, the flow characteristics of each component of the engine are measured on a calibration bench for oil flow versus pressure drop at the temperatures that are required. When all of the engine’s components have been identified, the engine is taken apart, the parts are reassembled, and it is put through its paces. Following that step, the flow rate is computed with the help of the pressure measurements that were collected. This method is commonly employed during critical engine lubrication surveys, which are carried out under circumstances where installing a flow meter can negatively influence the oil flow system.

Image Source: Flowmetrics

(5) A clamp is made of ultrasonic waves attached to the meter. Due to the device’s requirements, the system’s installation must adhere to the path of a straight pipe. This is the case even though the device in question does not involve any intrusion. This makes the technology more invasive in the oil measurement system than it would be. Although progress is being made faster than most other methods, it is still very expensive to acquire. In addition, it has not yet been tested adequately in these applications to be considered a suitable candidate. Despite this, however, its development of it is moving faster than with other methods.

When it comes to the process of obtaining accurate results from your flow measurement, if you have already selected your method of flow measurement and carried out the necessary degree of flow meter calibration over the range of operating temperatures, you are very close to making a significant step forward in the process. The Flow Calibration Laboratory is the most helpful resource for engineers still getting their feet wet in engine lubrication research and looking for guidance. The employees should have adequate knowledge of this flow measurement application and be positioned to locate the solution most suited for their financial constraints and the flowmeter hardware inventory.

Image Source: Integrated Flow Solutions

Other things to consider include that it is extremely challenging to obtain accurate oil flow readings from a running engine due to the complex nature of engine oil flow measurement; however, an experienced engineer can make reasonable engineering conclusions based on their measurement technique. Keep in mind the effects of fuel dilution, engine oil levels, the viscosity of the oil, the temperature of the oil, the effect that the placement of the meter has on the performance of the flowmeter and the oil pump, oil aeration, the effects of relief valves and their hysteresis, the effects of oil viscosity, and so on. During the subsequent iteration of our chats, we will delve even further into the repercussions of these criteria and investigate them more comprehensively.

Now, if you want to buy an Engine Oil Flowmeter now, we can recommend a few of our top choices:

  • ✔【DIGITAL LCD DISPLAY】The aluminum alloy flow meter has LCD screen display, which can provide clear reading. Meanwhile, the LCD display flow meter is used to control and measure low flow.
  • ✔【READING AND ACCURACY】There aluminum alloy fuel diesel flow meter has intuitive clear reading and high reliability on digital stainless steel turbine flow meter, measuring accuracy is ±1%.
  • ✔【WIDE COMPATIBILITY】The high accuracy fuel flow meter is suitable for high viscosity liquid media such as diesel, gasoline, kerosene, engine oil and other lubricants.
  • ✔【RELIABLE QUALITY】The blue LCD display high accuracy aluminum alloy fuel diesel flow meter is 100% brand new and high quality. Meanwhile, it is made of high quality material, durable and long service life.
  • ✔【100% WARRANTY】We promises every customer a 100% shopping satisfaction, feel free to reach us if you have any questions about your purchase.We will give you a professional and detailed reply within 24 hours.Click to buy now!
  • Inlet & Outlet:BSPT/NPT (Female);Existing size:3/4";1" ;1.5";Flow Range: 3/4" & 1":10-100L/Min,1.5":40-280L/Min
  • Accuracy: +-1%, ;Repeatablity:+-0.3%;Pressure rating:300PSI/21bar;Working Tempreture:-25C ---- +121C
  • Body material: Aluminum;Specifications: 1":105*32*66mm L*W*D ,1.5":135*68*45mm L*W*D
  • Bearings:Ceramic;Shaft:Tungsten Carbide;Turbine Flowmeter:Low-cost,High-precision,Durable & Compact
  • The internal components are easy to replace, easy maintenance
  • 🚩Lightweight and compact size offers convenient operation and updated installation (May be you will get the light Blue Flow Meter, please do not worried, they are the same product, just the color is different)
  • 🚩Modular Design: Makes diesel fuel flow meter suitable for use with output modules, sensors and remote transmitters
  • 🚩Digital LCD Display : High-definition displays show both instantaneous and cumulative flow with NPT Counter
  • 🚩Clear Reading & Accuracy Measuring: Intuitive clear reading, high reliability, measuring accuracy is ±1%
  • 🚩Application: Pump Flow Meter, can be widely used to measure water,diesel, kerosene, gasoline, etc
  • FLOW METER: the 1 inch flow meter can read instantaneous flow rate, single cumulative flow and total cumulative flows. But it has minimum flow rate requirment, if the flow rate of the tested liquid is lower than 2.5 gal/min, the readings will be inaccurate.
  • TECHNICAL PARAMETERS:① diameter of water inlet: 32mm; ② max. working pressure: 0.6MPa; ③ the flow speed requirenment for tested liquid: 2.5~26 gal/min; ⑥ max temp of tested liquid: 158°F/70°C; ⑦ Accuracy: ±1% ; ⑧ NO batteries inclued
  • MULTIPLE UNITS: the flow meter provide 4 meauring units for option, which are liter, gallon, pint and quart. The unit defaults to gallons, if the unit is not gallons, please refer to the user manual to change the unit to the needed one.
  • NOT WATER PROOF: the flow meter is not water proof, please keep the display from water during use, to avoid chip damage. We upgraded The flowmeter has been upgraded from never-sleep model to auto-sleep model, which automatically dims the screen when no liquid is flowing through it.
  • WIDE APPLICATION: The turbine flow meter can used for measuring the water, gasoline, diesel, kerosene, methanol and other low-corrosive, non-viscosity liquids. If there is any problem, please contact us in time.
  • 【Wide Application】The digital turbine fuel flow meter can be used to measure diesel, gasoline, kerosene, methanol and so on. Suitable for the flow rate of 10-100LPM(2.6-26GPM).
  • 【Multifunctional】Zero function, instantaneous flow, and cumulative flow readings on the display with the arccuracy of ±1%.
  • 【Convenient Use】The turbine flow meter can switch between liters, gallons, pints and quarts to meet your different needs.
  • 【High-Quality Materials】The flow meter is made of corrosion-resistant aluminum housing and stainless steel turbine, and have superior sturdiness and durability.
  • 【Warn】With 2 x LR03 AAA batteries, the circuit is stable, long-service life and high efficiency. Do not forget to remove the battery when out of use because it is long-working and can't be turned off.

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