单项选择题
Many cast iron pistons are designed with heat dams, which serve to （）
A.keep piston crown temperatures elevated for smoother combustion
B.reduce the possibility of overheating the top compression ring
C.help retain the heat of compression to prevent ignition delay
D.help retain the heat of compression to prevent combustion knock
点击查看答案&解析
相关考题
-
单项选择题
The adverse effects of burning high sulfur fuel can be compensated for by using a cylinder oil having sufficient（）
A.dispersant additives
B.floc point
C.alkalinity additives
D.ignition quality -
单项选择题
Scuffed cylinder liner surfaces in a diesel engine can result form（）
A.starting the engine hot
B.knurling the piston skirt
C.operating an overheated engine
D.using scuff resistant piston rings -
单项选择题
When comparing different fuels for different engines, the ignition quality of diesel fuel oils becomes a less critical consideration as （）
A.the amount of lube oil additives increase
B.piston speeds increase
C.injection pressure decrease
D.engine speeds decrease
