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High performance piston aircraft engines do have valve overlap, just like high performance engines used in land vehicles, and for the same reasons. Listen to the Continental O-470, IO-520, IO-550, even IO-360 at idle (or Lycoming IO-540) and you can hear the same exhaust note quality as a racing car engine.
Does not have one. The engine uses cam overlap to achieve the effect of the EGR valve.
If the peaks of the cam lobes are all worn the camshaft needs to be replaced. It will affect the valve timing and the air intake into the engine which in turn affects the performance.
It improves the efficiency of the engine by allowing better exhaust out flow and intake in flow.
Yes of why not...you should complete change your 12 valve 1300 cc engine to 16 valve 1300 cc EFI Engine for better performance and less fuel,GAS consumption.
send a small amount of raw fuel/air to the catalytic convertor,which increases the efficiency of the operating engine.
If the valve timing is correct and there are no damaged engine parts (or weak/faulty valve springs) that should not happen, yet however if the engine is "over-revved" the valves could "float" which is not normal operation. (If the engine is an interference engine there may possibly be engine damage.) That is normal and it is called valve overlap.
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
There is a short time between the exhaust and intake stroke where all the valves are slightly open at the same time. This period of time is called valve overlap. This is because the intake valves are just starting to open as the exhaust valves are just finishing closing. This is done so flow through the engine can be maintained at engine operating speeds.
If the valves are incorrectly adjusted it will hurt performance.
Yes...worth doing early to keep engine running at peak performance.
The EGR Valve is an emission regulation valve or Exhaust Gas Recirculation valve is the full name. What it does is recycle the exhaust output back through the engine. It is designed to reduce emissions into the atmosphere. The effect it has on your car? A negative one, this valve (when operational) decreases performance and over time increases carbon deposits within the engine itself (which is obviously not good for it) I have blocked the EGR valve in my Honda permanently by welding it shut (you can also buy blocking kits) The performance of my car increased immediately, however you do have to put up with a permanent Engine check light.