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Q: How valve overlap affects engine performance?
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When valve overlap happens to aircraft reciprocating engine?

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.


Where is the EGR valve on a 1997 Hyundai Elantra?

Does not have one. The engine uses cam overlap to achieve the effect of the EGR valve.


What are the effects on valve timing if the peaks of all cam lobes become worn?

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.


What is purpose of valve overlap?

It improves the efficiency of the engine by allowing better exhaust out flow and intake in flow.


Should you change Toyota engine 1300CC 12 valve carburetor to 1300CC 16valve EFI engine for better performance?

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.


What does a overlap valve do?

send a small amount of raw fuel/air to the catalytic convertor,which increases the efficiency of the operating engine.


In a four stroke engine the time period when both valves are slightly open is called valve?

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.


What is 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


What is meant by the term valve overlap?

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.


Can wrong valve clearance cause the engine to stall?

If the valves are incorrectly adjusted it will hurt performance.


Valve adjustment on a 1995 vfr 750?

Yes...worth doing early to keep engine running at peak performance.


What is the EGR valve on a Honda Accord?

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.