The term for the time when both the intake and exhaust valves are open simultaneously is called "valve overlap." This occurs during the end of the exhaust stroke and the beginning of the intake stroke in a four-stroke engine cycle. Valve overlap can enhance engine efficiency by allowing better exhaust scavenging and improved intake charge filling.
The proton savvy uses a renault 1.2 16V engine code D4F and many specs can be found on line from renault forums. 11 TOP AND FRONT OF ENGINE Cylinder head gasket 11-7 Setting the valve clearances Valve clearance setting values (in mm): - inlet 0.05to 0.12 - exhaust 0.15to 0.22 Open exhaust valve method Bring the exhaust valve of cylinderno. 1 to the fully open position, then adjust the inlet valve clearance for cylinder no. 3and the exhaust valve clearance for cylinder no. 4. Follow the same method for the other cylinders, in the order shown by the table below.
Windsock
The two types of thrust reverser are the target-style thrust reverser and the clamshell-style thrust reverser. The target-style thrust reverser redirects the jet exhaust forward using a metal plate or "bucket." The clamshell-style thrust reverser consists of two doors that open outwards to redirect the jet exhaust.
I dont know why it might smell like propane in your case but my car runs on propane so the exhaust has a propane sorta smell to it. In your case id check your exhaust. You might need a new catalytic converter or something may be leaking under your hood.
The main function of lifters in a motor is to transfer the motion of the camshaft into vertical motion to actuate the valves. This vertical motion allows the valves to open and close at the appropriate times to let air and fuel into the engine and exhaust gases out.
The camshaft(s) lobes push up on the rockers on top of the cylinders, which pushes down on the vavles, causing them to open
Valve overlap.
In a four-stroke reciprocating engine, both valves—the intake valve and the exhaust valve—open to facilitate the engine's four distinct strokes: intake, compression, power, and exhaust. The intake valve opens to allow the air-fuel mixture into the combustion chamber during the intake stroke, while the exhaust valve opens to release exhaust gases after combustion during the exhaust stroke. This coordinated opening and closing of the valves ensure efficient engine operation and optimal performance.
Valve overlap occurs in a four-stroke engine at the end of the Exhaust stroke and at the beginning of the Induction stroke; and is when both the exhaust and inlet valves are open at the same time. At the end of the Exhaust stroke, the Exhaust valve is closing and the Inlet valve is starting to open in preparation for the induction of fuel and air into the cylinder. It is common knowledge that in vehicles that cannot alter the valve timing, the Inlet valve opens approx 6 degrees before top-dead-centre and the Exhaust valve closes at 9 degrees after top-dead-centre
-intake: exhaust closed, intake open -compression: exhaust closed, intake closed -combustion: exhaust closed, intake closed -exhaust: exhaust open, intake closed
In a four-stroke engine, both the intake and exhaust valves are closed during the power stroke, allowing for maximum pressure to build from the combustion of the air-fuel mixture. Similarly, during the exhaust stroke, both valves are also closed momentarily after the power stroke until the piston moves up to expel the exhaust gases. However, the intake valve opens before the power stroke begins, and the exhaust valve opens at the end of the power stroke to facilitate the exhaust process. Thus, while both valves are closed during the power and exhaust strokes themselves, they open at specific times in the cycle.
Valves are used to open/ to let in red blood cells and to clos when they are done this is also the sound of your heart beat is the vavles opening and closing
Valves are used to open/ to let in red blood cells and to clos when they are done this is also the sound of your heart beat is the vavles opening and closing
the open end of the exhaust pipe is cut at an angle.
Valve timing overlap is the time when both exhaust and intake valves are open most engines with catalytic converters require valve overlap in order to send a small amount of raw fuel/ air mix to the converter's. An "open cam" has valve overlap a "closed" cam does not
During the four-stroke cycle, both the intake and exhaust valves are open simultaneously during the overlap period, which occurs at the end of the exhaust stroke and the beginning of the intake stroke. This typically happens just before the piston reaches the bottom of the exhaust stroke and just as it starts to descend for the intake stroke. The overlap allows for better scavenging of exhaust gases and aids in the intake of the fresh air-fuel mixture. The exact timing of this overlap can vary based on the engine's design and camshaft specifications.
The combustion chamber has an exhaust valve and an intake valve. The power stroke is ignited just before TDC, in timing with the spark plug to ignite the fuel/air mixture. Hence, this forces the piston down with both valves closed. NOTE:Intake stroke (valve open to receive the f/a mixture), Compression stroke, both valves closed, Power stoke (see above), Exhaust stroke (piston upwards, with only exhaust valve open.