NOW2. 01. 2 0. 4 1. NOW Magazine issuu. Published on Sep 9, 2. NOW Magazine. Volume 3. Datsun camshafts valve timing by Racer Brown. Racer Brown was a licensed mechanical engineer and was once technical editor for hot rod magazine. Fruited to raw sugar sweetness, cinnamon mixed with raw sugar, raisin and chopped date, snickerdoodle cookies, cherry soda, and tart lingonberry. Degrees Of Separation Zippy' title='6 Degrees Of Separation Zippy' />If you are not sure what the difference is between a nephrologist and urologist, you are not alone Many people are unsure of the difference. Start your own business, be your own boss, set your own hours. Entrepreneurs Looking for Opportunities Earn income with an award winning global company that set the. Issuu is a digital publishing platform that makes it simple to publish magazines, catalogs, newspapers, books, and more online. Easily share your publications and get. Racer Brown Datsun 5. Racer Brown was a licensed mechanical engineer and was once technical editor for hot rod magazine. Racer Brown cams are standard part numbers for Mopar, Nissan Competition Department and others. GdcS21Pa_fw/hqdefault.jpg' alt='6 Degrees Of Separation Zippy' title='6 Degrees Of Separation Zippy' />Grab yourself a stubby, get comfortable and read into the fascinating world of Datsun and other engine valve train operation. Once read a couple of times you will likely understand more about camshafts, valve train geometry and the things affecting them than most of your mates and some automotive engineers as well. Datsport has been extremely fortunate to be permitted to reproduce what is widely recognised at being the best article ever written on camshafts and their operation. Degrees Of Separation Zippy' title='6 Degrees Of Separation Zippy' />We thank Racer Brown Incorporated for this opportunity. Please be aware that this information is copyright and may not be reproduced in any format whatsoever. Degrees Of Separation Zippy' title='6 Degrees Of Separation Zippy' />This article has not been reproduced in its original form since 1. Please respect the copyright as we do not wish to jeopardise the right to reproduce this technical article as it will deprive Datsun enthusiasts of the most important information affecting the performance of Datsun L series engines. Introduction. Piston at top centre TC compression stroke, both valves closed. Explosion BANG Piston forced to bottom centre BC during power stroke by explosion in cylinder. Piston at BC of power stroke. Exhaust valve opens. Piston pushes exhaust gases from cylinder by moving toward TC. Drivers Ati Radeon X1900 Xt there. Top centre exhaust stroke. Exhaust valve closes. Intake valve opens. My Profile Profile Editing Wordpress Plugin Developer there. Piston moves toward BC on induction stroke. Bottom centre of induction stroke, intake valve closes. Piston moves toward TC on compression stroke, compressing combustion fuel, both valves closed. Cycle complete. Ready for another explosion BANG Sound dull It is dull. The mechanical textbook world must necessarily and primarily be concerned with theoretical aspects of mechanical problems and their solutions. Practical considerations are secondary to the teaching and learning of theories. In the real world, the situation is usually reversed. And so it is, and has been with the four stroke cycle internal infernal, if you prefer combustion piston engine. Practical applications of concepts, ideas and modifications have had such incredibly mind boggling results since the inception of this type of power plant that the original theoretical approach, as it is still taught and learned, is as antiquated as if it had been carved by hand on tablets of stone. This doesnt suggest that the basic premise, as taught and learned, is necessarily wrong. It does suggest that this premise has been oversimplified to unattainable extremes. Perhaps this isnt all bad for the novice, but for more advanced students of the four stroke cycle engine, this most basic approach falls flat on its nose, simply because it is inadequate. And DULL. The latter factor alone has probably been the direct cause of more dropouts in this area of study than such unrealistic teaching methods could ever hope to gain. While the study of the four stroke cycle engine may not be the most stimulating pursuit in the world, it is anything but dull. Moreover, the practitioners of practicalities the imaginative designers, innovators, inventors, doers have almost completely rewritten the original theoretical premise so the original tablets of stone, carved by hand, may be safely consigned to the gravel pit. An explosion BANG Good grief But there was an explosion back about 1. Christian Huygens tried to make a functional engine using gunpowder as fuel. But history doesnt tell us about the immediate after effects. Probably a case of no survivors during a one shot experiment. BANG FACTNow bear with me through the dreary details of a most basic four stroke cycle engine. The assembly consists of a crankcase or cylinder block, in which resides a crankshaft. The cylinder block is bored to accept a piston assembly that reciprocates in the bore. From a front or rear elevation, the cylinder bore centre usually, not always coincides with the crankshaft axis. Longitudinally, the bore centre is perpendicular to the crankshaft axis. The crankcase also contains main bearings, which support the crankshaft main bearing journals. Between main bearing journals, the crankshaft has a crankpin parallel to the crankshaft axis but offset from it by an amount equal to exactly one half the piston stroke. The lower part of a connecting rod contains connecting rod bearings and this end of the rod is clamped to the crankpin. The top end of the connecting rod hooks up to a piston pin located in the piston assembly, the piston pin also being parallel to the crankshaft axis. These components represent the mechanical linkage necessary to transform the pistons reciprocating motion into rotary motion at the crankshaft. A cylinder head assembly, usually removable from the cylinder block, is located at the top end of the cylinder bore, away from the crankshaft. Among other bits of ironmongery, the cylinder head assembly contains an intake port and usually poppet valve, an exhaust port and usually a poppet valve and some provision to accept a spark plug, or other means of igniting a combustible fuel under pressure. A cavity in the cylinder head, surrounding the valve and spark plug, forms the combustion chamber, although it can be formed in the top of the piston, or a combination of both. There are sub systems for providing the cylinder with the combustible fuel induction system for carrying the products of combustion from the cylinder to the atmosphere very difficult to do legally, these days exhaust system for opening and closing the valves at the proper times and for the proper intervals valve train system for delivery of lubricant under pressure to critical areas lubrication system for carrying off excess heat generated by normal engine operation and dissipating the heat to the atmosphere cooling system for supplying electrical energy to the spark plug for igniting the combustible fuel in the cylinder under pressure ignition system. This is the basic lump, the assembly from which we expect some useful work to be done for us because we are too lazy to do it ourselves. Of course, there are other accessories such as ps, pb, ac, 8 track stereo, etc. But Im talking about the standard item, the poverty model. A combustible fuel was mentioned, without which the engine couldnt fire its first power stroke. It really doesnt matter if the fuel is a mixture of hydrogen peroxide, diesel oil and oxygen not for amateurs, the more common alcohols, to gasolines, to old socks as long as its behaviour under heat, compression and ignition is uniform and predictable. However, in this context, plain old pump type gasoline is the indicated fuel. We will make the assumption that the induction system does an acceptable job of delivering a mixture of air and fuel in the correct proportions to the cylinder. Plain old atmospheric type air is necessary to support combustion of the fuel in the cylinder, the oxygen of the air being the necessary compound. As the term implies, the four stroke cycle engine completes its cycle in four complete strokes of the piston within the cylinder. One stroke of the piston is defined as the motion of the piston from the top of the cylinder bore top centre to the bottom of the bore bottom centre, or from BC to TC.