Re: Running in a 84 Mariner 75hp after a Rebuild
Do yourself a favor on the break-in. This sounds very unorthodox, but I'll swear to you that it works and you will see better results and power out of that new engine. <br /><br /> Take it out for the first time, let it warm up completely and then firewall it. Seriously, open her up full bore and let her climb up to WOT- then shut down and coast. Return back to idle and do that again. <br /><br /> The science here is how rings seat. Rings and cylinders will wear to match each other. When you "baby" an engine and don't run it hard, the rings don't get enough pressure against them to seat themselves fully. You will get 80% or 90% seating. When you run it hard and maximize the pressures in the cylinders, you get a much higher chance of achieving 100% seating.<br /><br /> Take any engine apart that has been "babied" and look at the pistons. See the brown stains down the sides of the piston, past the rings and on down? That's blow by and it is caused by a poor ring/wall seal. That doesn't happen when you break them in hard and get 100% contact. Your power goes up, your fuel consumption goes down and the engine itself will last longer because you're not getting as much burnt fuel by-products in the crankcase. <br /><br /> This isn't BS- it's been documented and researched. I have torn down probably a 1,000 engines over the years and hands down, the worst machines I found were those driven by "little old ladies" that never really opened up the throttle. Low mileage vehicles that needed engines because of severe oil useage or excessive blow-by, causing high crankcase pressures and seal/gasket failure. <br /><br /> So take it out and run it hard- you'll find that it runs much better later in life. <br /><br />UFM82
