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Pop-Off Valve
A one-way valve that opens to the atmosphere above a certain set pressure to relieve excessive internal pressure buildup; often used with a turbocharger installation to the limit boost pressure to the engine.
 

Petroleum
A complex mixture of hydrocarbons and small amounts of various other elements occurring widely in nature as deposits of decomposed organic matter.

 

Power Steering
A steering system generally using hydraulic pressure to multiply the driver's effort as he turns the steering wheel so that steering effort is reduced.

Push Rod
A connecting link in an operating mechanism, specifically the rod interposed between the valve lifter and the rocker arm on overhead-valve engines.

Purchase Option
Most closed-end leases grant the lessee an option to purchase the vehicle at the end of the lease. The end-of-lease purchase price is usually the same as the stated residual value. Check your lease contract before signing to ensure that there is a purchase option. The lessor must disclose the purchase option price prior to your signing the lease contract.

Purchase Price
This is the price you would expect to pay for the vehicle if you were financing or buying the vehicle. To determine the purchase price, start with the MSRP and subtract any manufacturer discount and dealer discount you negotiate. Purchase price is a key determinant of the true cost of a lease. Purchase price less your down payment and dealer participation equals the net capitalized cost.


Plenum

A chamber, located between the throttle body and the runners of an intake manifold, used to distribute the intake charge evenly and to enhance engine breathing.

Piston
A round or cylindrical plug, which closed at one end and open at the other. It slides up and down in the cylinder. It is attached to the connecting rod and when the fuel charge is fired, will transfer the force of the explosion to the connecting rod then to the crankshaft.

Piston
A round or cylindrical plug, which closed at one end and open at the other. It slides up and down in the cylinder. It is attached to the connecting rod and when the fuel charge is fired, will transfer the force of the explosion to the connecting rod then to the crankshaft.

Pitch
1. The back and forth rocking motion of a vehicle, which compresses the front springs and extends the rear springs so that the nose of the vehicle is down while the tail is up. Then the action reverses so that the nose is up and the tail is down (i.e., dive and squat).
2. The distance between two threads on a bolt or screw.
3. The distance between a point on one gear tooth and the same point on the next gear tooth.
4. The quality of sound with respect to the frequency of vibration of the sound waves.
5. The angle at which something is tilted.

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