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Most older ignition coil systems used a single coil shared by all the spark plugs (via a distributor). There were some exceptions, such as the Saab 92 and the Wartburg 353 using a separate coil for each cylinder and the 1948 Citroën 2CV using a wasted spark system with a double-ended ignition coil and no distributor.
The ELB computer also directly drove the ignition coil, eliminating the need for a separate ignition module. ELB was produced in both open-loop and closed-loop variants; the open-loop systems produced exhaust clean enough for many vehicle variants so equipped to pass 1976 and 1977 US Federal emissions regulations , and Canadian emissions ...
A trembler coil, buzz coil or vibrator coil is a type of high-voltage ignition coil used in the ignition system of early automobiles, most notably the Benz Patent-Motorwagen and the Ford Model T. [2] Its distinguishing feature is a vibrating magnetically-activated contact called a trembler or interrupter , [ 3 ] [ 1 ] which breaks the primary ...
A dual ignition system will typically provide that each cylinder has twin spark plugs, and that the engine will have at least two ignition circuits, such as duplicate magnetos or ignition coils. [3] Dual ignition promotes engine efficiency by initiating twin flame fronts, giving faster and more complete burning and thereby increasing power. [4]
A variation coil-on-plug ignition has each coil handle two plugs, on cylinders which are 360 degrees out of phase (and therefore reach top dead center (TDC) at the same time); in the four-cycle engine this means that one plug will be sparking during the end of the exhaust stroke while the other fires at the usual time, a so-called "wasted spark ...
Ignition Lucas coil, later four Lucas magnetos. One spark plug per cylinder; Valve gear 2 valves per cylinder @ 80 degrees with twin overhead camshafts per cylinder bank, via gear train from the centre of the crankshaft. Hairpin valve springs. Inlet valves 1.25 in (32 mm)
A predecessor system called "Unitized Ignition" was optional on 1972 and 1973 Pontiacs. [citation needed] Most—but not all—HEI systems have the ignition coil mounted in the distributor cap. A control module and magnetic pickup are mounted in the distributor, in place of a conventional ignition system's breaker points and condenser.
The contact breaker is operated by an engine-driven cam.On an engine with a distributor, the contact breaker can be found beneath the distributor cap.The position of the contact breaker is set so that it opens (and hence generates a spark) at exactly the optimum moment to ignite the fuel/air mixture.
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