RPM @1K, 2K, 3K, 4K, 5K, 6K, 8K, 10K The way a distributor style ignition system works is basically, the battery sends power to the ignition coil which amplifies the voltage then that voltage goes the the distributor and is sent to the correct cylinder. If using a points style distributor, the points open and close allowing the voltage to flow when needed. when the correct cylinder is ready, the voltage goes through the ignition wire to the plug. You can use a 50k volt coil, but you need to make sure your system can handle it first. You unfortunately have some of your terminology back to front... A cycle is completed once it has done the following process Intake, Compression, Power and Exhaust hence the name "cycle". Revolutions of the crankshaft (not engine, as engines don't rotate, unless you are speaking very generically i.e. engine revs) have a fixed relationship to the cycles. A four stroke engine completes two full rotations of the crankshaft (720 degrees not 1440) per full engine cycle. Intake / compression happen on one rotation and power / exhaust happen on the other. +paulex Grip is correct in saying that a revolution is the same regardless of two or four stroke, as a crankshaft rotation is a crankshaft rotation, (360 degrees). Whereas the so called "RPM" which is displayed on the tacho gets truly interesting. An electronic tacho doesn't actually display revs, but rather coil pulses displayed as revs. Let me explain... The tacho receives it's pulse signal from the coil, and as we know the coil only fires every Power stroke (technically at the end of the Compression stroke but lets not involve camshaft timing). And depending on how many cylinders there are in the engine this will dictate how often the coil fires. a four cycle V8 will fire a cylinder every 90 degrees of crankshaft rotation. We know it takes 720 degrees of rotation to complete a firing event on every cylinder. So that's 720 / 8 cylinders = 90 degrees. If it was a 4 cylinder the coil would be firing every 180 degrees, so with a V8 the coil fires four times per crankshaft revolution and only twice with a four cylinder. The same tacho could be used for both engines but the V8 has to be divided by 4 to show 1 RPM whereas the 4 cylinder would only have to be divided by 2.
CDI Spark 1000 - 10000rpm w/ denso iridium spark plug
Watch video now
0 comments
Write Down Your Responses