Negative pressure is created in the crankcase of an engine through the process of crankcase ventilation. This system allows blow-by gases, which are a mixture of air, fuel, and exhaust gases that escape past the piston rings during combustion, to be vented out of the crankcase. As these gases are expelled, they create a vacuum effect within the crankcase, resulting in negative pressure. This negative pressure helps to improve engine performance by reducing internal air pressure and preventing oil leaks. **

Your scooter may be losing oil and smoking from the valve cover breather hose due to a few possible reasons. One potential cause could be worn piston rings or valve seals, which can lead to oil being burned in the combustion chamber and then expelled through the breather hose. Another possibility is that the breather hose is clogged or blocked, causing pressure to build up in the crankcase and forcing oil out through the hose. Additionally, if the scooter is overfilled with oil, it can lead to excess oil being pushed out through the breather hose. It's important to have a professional mechanic inspect and diagnose the issue to determine the exact cause and necessary repairs. **

The indication 1090 on the Unity Media Horizon HD Recorder typically means that the device is not receiving a signal from the cable provider. This could be due to a variety of reasons such as a loose cable connection, a service outage in the area, or a technical issue with the cable box itself. To resolve this issue, you can try checking the cable connections, rebooting the device, or contacting your cable provider for assistance. **

Yes, herbal cigarettes are typically marketed and sold to individuals who are 18 years of age and above. Just like traditional tobacco cigarettes, herbal cigarettes contain ingredients that may be harmful if consumed by minors. It is important to adhere to age restrictions and regulations when purchasing and using herbal cigarettes to ensure the safety and well-being of individuals. **

It is possible to receive police radio transmissions on frequencies between 870 and 1090 MHz. However, it is important to note that police departments typically use frequencies in the VHF (Very High Frequency) and UHF (Ultra High Frequency) bands, which are lower than 870 MHz. Frequencies in the 870-1090 MHz range are more commonly used for air traffic control communications. To listen to police radio transmissions, it is recommended to use a scanner or radio receiver that covers the appropriate frequency bands used by law enforcement agencies. **

The crankcase of a Simson moped typically holds around 800 ml of oil. It is important to regularly check and maintain the oil level in the crankcase to ensure proper lubrication of the engine components and optimal performance of the moped. Overfilling or underfilling the crankcase with oil can lead to engine damage, so it is essential to follow the manufacturer's recommendations for oil capacity. **

Yes, the oil pump on the crankcase of the scooter is essential for lubricating the engine components and ensuring smooth operation. Without the oil pump, the engine may suffer from excessive friction and heat, leading to premature wear and potential damage. It is important to regularly check and maintain the oil pump to ensure proper lubrication and prolong the life of the scooter's engine. **

Cars do not have an open crankcase ventilation with an oil mist separator because it can lead to environmental pollution. An open system would release harmful emissions, including unburned hydrocarbons and particulate matter, into the atmosphere. Additionally, an open system could potentially allow dirt and debris to enter the engine, causing damage and reducing its efficiency. Therefore, modern cars are equipped with closed crankcase ventilation systems that route the gases back into the intake system to be burned in the engine. **