Chemistry of Engine Combustion Deposits by John P. Longwell (auth.), Lawrence B. Ebert (eds.)

By John P. Longwell (auth.), Lawrence B. Ebert (eds.)

On March 30, 1981, a symposium entitled "Chemistry of Engine Combustion Deposits" was once held on the 181st American Chemical Society nationwide assembly in Atlanta, Georgia, below the sponsorship of the Petroleum department. This ebook is an out­ progress of that symposium, together with papers from the entire At 1 anta presentors, as we eleven as from others who have been i nvi ted to give a contribution. study on engine deposits has no longer been as "glamorous" as within the rel ated fossil gasoline components of petrol eum, coal, or oil shale, and guides within the box were mostly restrained to combustion and car engineering journals. One objec­ tive of this e-book is to carry a wide physique of labor at the chemistry of deposits into extra basic accessibility. we are hoping to make humans extra acquainted with what deposits are, with what difficulties they reason, and with what current employees are doing to unravel those difficulties. The production of the ebook has concerned many of us. Patricia M. Vann of Plenum Publishing company gave assistance in making plans. We thank Claire Bromley, Ellen Gabriel, and Halina Markowski for the practise of a number of the Exxon contribu­ tions. ultimately, we thank Joseph C. Scanlon for his worthy suggestion and encouragement.

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After the V-8 engine operated for 609 hours on the test fuel, the air-fuel ratios of the individual cylinders and engine were determined at five level-roadload speeds (30, 35, 45, 55, and 65 mph) and at wide-open-throttle (WOT) , 2500 rpm in second gear - the condition under which the engine was octane rated. The heads of the engine were then unbolted, and all combustion chamber deposits were physically removed. After reassembling the engine, the AFR's were determined again. The intake port and intake valve deposits were removed next.

9 17. 5 16. 8 16. 1 16. a 16. 1 16. 1 16. 9 16. 1 16. 7 16. 3 16. 1 16. 2 16. 0 16. a 16. 7 11. 3 11. 0 11. 0 II. 0 12. 3 11. 7 II. 2 11. 5 11. 3 11. 3 ILl II. a 11. a II. 0 Overall Engine BA - After 609 hours of deposit accumulation (about 22,000 miles). B - After all combustion chamber deposits removed. C - After all intake port and intake valve deposits removed. D - After all valve faces and seat ground, carburetor cleaned, and new spark plugs. bWide-Open-Throt t Ie, 2500 rpm in second gear: engine octane rating conditions.

L AFR; (c) removal of deposits had no significant effect on the AFR' s of the individual cylinders; and (d) the cylinders in the right bank of the engine were operating leaner (up to one AFR) than those in the left bank. This latter observation was unexpected, and it appeared to be a characteristic of this particular two-barrel carburetor, since AFR measurements with other same model engines showed no differences in AFR between cylinder banks. This recent-design V-8 engine is unusual in that the cylinders have siamese intake ports; that is, the intake manifold has only four runners, instead of eight, and the right barrel of the carburetor supplies the four cylinders in the right head and the left barrel those in the left head.

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