Assertion: engine's compression ratio | /r/Desires | higher octane rating
Facets:
value: to avoid pre-detonation
type: PURPOSE
Source sentences:
text: Thus, hemi-heads, because of their lack of squish, are more sensitive to fuel octane rating; a given compression ratio will require a higher octane rating to avoid pre-detonation in a hemi engine than in some conventional engine designs such as the wedge and bathtub.