| 词条 | Short block |
| 释义 |
A short block is an engine sub-assembly comprising the portion of the cylinder block below the head gasket but above the oil pan.[1] An in-block cam engine includes the camshaft, timing gear, and any balance shafts. Overhead cam engines don't include those parts. ApplicationsMechanics purchase a shortblock as a quicker way to rebuild an engine—avoiding the work and time of rebuilding and assembling the shortblock components. Companies that provide short blocks may also offer performance improving engine work.{{fact|date=July 2016}} Machine shop work can increase performance by boring out the engine to increase cylinder diameter (which increases internal volume), balancing rotating assemblies (such as the crankshaft), installing a higher performance camshaft, etc. Bored-out engines require larger pistons and new piston rings. This kind of work can be done by amateurs ("shade tree mechanics") or by professional machine shops and engine rebuilders. A short block is considered destroyed when it either warps or cracks, often due to overheating.{{fact|date=July 2016}} See also
References1. ^{{cite book|author=Jack Erjavec|title=Automotive Technology: A Systems Approach|url=https://books.google.com/books?id=U4TBoJB2zgsC&pg=PA227|year=2005|publisher=Cengage Learning|isbn=1-4018-4831-1|pages=227–}} {{DEFAULTSORT:Short block}} 2 : Engine technology|Auto parts |
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