EVOM BAD CAM SENSOR INSTALL
This isn’t something the engine management system has any control over so we need to physically install the distributor in the correct position relative to the desired firing angle. If the engine comes around to 30 degrees before top dead centre cylinder 1 and the rotor button is sitting right over the top of the post for cylinder 1 when the coil fires we’ll get a good firing event, but if the button is sitting In between cylinders 1 and 3, or sitting over here on a completely different cylinder we will get a cough, a bang or a backfire and the engine won’t run. In order to produce the highest spark energy possible and reduce the risk of cross-firing we need to get the rotor button as close as possible to the post for the desired cylinder when the spark fires. Instead, we are firing into a locked distributor and therefore need to make sure that the spark can mechanically make its way through the rotor button to the right cylinder – and that’s what’s known as rotor phasing. When we change the desired ignition timing in the ignition mapping we aren’t physically twisting the distributor to get the result. Things get a little more complicated when we add a modern engine management system triggered from a crank position sensor which then sends a signal to the coil to fire through the distributor to the desired spark plug.
EVOM BAD CAM SENSOR FULL
In factory form, you would twist the distributor to advance or retard the ignition timing, which would affect the full operating range of the engine, but it’s not so much the position of the rotor cap, rather the position of the points or electronic ignition inside the distributor which is in control of when the coil fires. So when you twist the distributor you’re moving the triggering event and the rotor phasing at the same time, inadvertently avoiding the problem that we are talking about. This is produced by a set of “Points” which are driven off lobes on the distributor shaft, an electronic ignition system which is triggered from a reluctor sensor on the distributor shaft, or from an engine management system which is being triggered off a crank and/or cam sensor.Ĭommon engines like the small block Chevy, Ford Windsor or the mighty Datsun L-series all relied on a distributor to take care of their ignition duties so Rotor Phasing is not a new thing, it’s always been there, it’s just that we didn’t always have infinite control over our ignition timing to amplify potential problems.
In order for the coil to generate a spark, it needs a charge signal synchronized with the engine position and speed. As the distributor shaft turns, the “Rotor Button” (which is connected to the top of the shaft) spins and directs the incoming spark (which it receives through a spring-loaded pin on the inside of the cap) to the correct cylinder. A distributor is driven off the camshaft and runs at cam speed which, in a 4 stroke engine, runs at half the speed of the crankshaft.
0 kommentar(er)
