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Which subframe function is most important in a modern car?

  • A.Carrying the entire weight of the vehicle, since the unitary body is not designed to take any structural load
  • B.Supporting the exhaust
  • C.Providing a mounting for the fuel tank, which must be isolated from the body structure for safety reasons
  • D.Isolating suspension loads and noise from the body

Answer: D

A subframe carries the suspension and often the engine, and attaches to the body through rubber bushes that filter road noise and vibration while providing a stiff platform for the suspension geometry. It also simplifies assembly, since the whole front end can be built up and offered to the body in one operation. The unitary body carries the primary structural loads. Most errors here come from carrying a result across from a neighbouring case where it does not hold.

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