| Overlap |
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A term that is used to describe the time that remain open the exhaust and admission valves stay open. This takes place while the piston is at its Top Dead Centre. at the end of the exhaust stroke and at the beginning of the admission stroke. During the overlap. the gases that come out of the exhaust leave a depression behind them and this is used to drag the fresh gases into the admission. To reduce hydrocarbon emissions this period is limited in road vehicles.
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| Overlap |
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A term that is used to describe the time that remain open the exhaust and admission valves stay open. This takes place while the piston is at its Top Dead Centre. at the end of the exhaust stroke and at the beginning of the admission stroke. During the overlap. the gases that come out of the exhaust leave a depression behind them and this is used to drag the fresh gases into the admission. To reduce hydrocarbon emissions this period is limited in road vehicles.
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| Oversteer |
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Effect that appears because of accentuated slip on the rear tyres and which moves this part of the vehicle toward the outside of a curve. It usually takes place on vehicles with rear wheel drive while accelerating in the middle of a curve. It is controlled by means of the counter steer and by lifting the foot lightly off the accelerator. the tyre stops transmitting so much force and can transmit more force for lateral guidance. On a vehicle with front wheel drive this is done with a slight counter steer and the accelerator is pressed so that the wheels guide the front part of the vehicle toward the exit of the curve.
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