Re: Mice

Posted by HH56 On 2018/2/23 10:58:56

Quote:
It is possible. For a plug to reliably fire under compression the spark needs to be considerably stronger than it does in open air. If the spark is marginal or the plugs fouled or moist then the spark could fail.

Make sure you have a good solid voltage at the coil. Engine off it should be battery voltage or maybe a tenth or so lower. Engine running it should be a bit higher depending on what the generator is doing. When cranking, ideally the voltage should not fall below 5.5v but as long as it stays above 5v it is usually adequate to start the engine if the plugs, wires, dist etc are in good condition.

Plugs work best -- particularly when hot -- when the spark starts at the center electrode and jumps toward the side electrode. To ensure that path and for the most efficient spark, If the battery ground is positive, make sure the + or positive terminal on the coil is connected to the distributor. Also make sure the distributor has a good ground. If grease, corrosion or looseness at the mount or oxidation has built up on the points the coil may not get a good solid ground so the resulting spark would be weaker. The gap and dwell spec is also important to ensure the points stay closed as long as possible to get the best coil saturation for the strongest spark.