Technician A says that current forged steel trunk pistons use a shorter wrist pin than comparable articulating piston assemblies. Technician A says that a disadvantage of forged steel trunk pistons such as Monotherm is much greater weight than comparable bore aluminum trunk pistons. Who is correct?

A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A nor B


Answer: A

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Technician A says that the when a HADI is operated in non-amplification mode, the resulting injection pressure should be roughly equivalent to the ACRS rail pressure. Technician B says that when the HADI is operated in amplification mode, ACRS injection pressure can more than double the rail pressure. Who is correct?

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