However , the engine 's length demanded the use of a long engine compartment , making the basic design unacceptable in modern vehicles .
The smooth running characteristics of the straight - eight made it popular in luxury and racing cars of the past .
The engine 's length demanded the use of a long engine compartment , making the basic design unacceptable in modern vehicles .
The smooth running characteristics of the straight - eight made it popular in luxury and racing cars of the past .