The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 04, 1989
Filed:
Sep. 29, 1988
Applicant:
Inventor:
Benjamin L Sheaffer, Fond du Lac, WI (US);
Assignee:
Brunswick Corporation, Skokie, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F02P / ;
U.S. Cl.
CPC ...
123310 ; 123661 ;
Abstract
In a two stroke internal combustion engine (2) having a pair of spark plugs (28, 30) for each cylinder (6), a particular height and spacing ratio of the spark gaps (32,34) have been found to produce misfire-free running during idle. The ratio h/H should be less than 0.5, where h is the height of the spark gaps (32, 34) above the squish surface (20) or the top (60) of the cylinder sidewalls, and H is the height of the top (36) of the combustion chamber above such surface. The ratio d/D should be in the range of about 0.25 to 0.35, where d is the distance between the spark gaps (32, 34), and D is the inner diameter of the cylinder (6).