This is why say, stock GSR motors are so tolerant. It would be able to handle say 13.5:1 longer than 15.5:1. This can vary depending on how lean it is over X period of time. Overheating is caused from the following reasons:ġ: Too lean of a fuel condition for too long. So if the piston is heated to where it expands that much, there is nowhere to go except to metal on metal and that’s where your going to get black deaths and failure immediately. 003, and it has a coating on it that’s a couple tenths thick, so it might go metal on metal at say. Too much heat on the piston causes expansion of the aluminum. The reasons this happens could be these:Ī: Overheating the piston. This problem kills your compression in that cylinder because the ring cannot seal on a non-smooth surface, and oil will leak in droves past the oil ring and burn in the combustion chamber leading to a lot of smoke out the back of your car. Black death is where the piston skirt hit the cylinder wall and causes scoring and the skirt of the piston turns black from the heat. This is prevalent on turbo motors using cast pistons especially or people using 4032 higher silicon pistons with turbo motors. When this happens, your motor is going to make a tapping sound, and it sounds like a bad valve adjustment, or even rod knock at low RPM. If your detonation or heat is severe enough, it will melt your piston all the way down to the ring grooves. They simply grind it down a little until it’s over. You will see the piston companies create a little valley, or recession in these areas of the valve relief on the edge of the piston. This area can and will crack/melt under high heat conditions if it’s too thin. On the outer edge of most Honda pistons you can see that the valve relief is quite thin because the valve is such that it comes close to the outside of the bore. At this time, it requires rebuild with oversize pistons. It becomes a threat when your cylinder walls are so worn that you’re not getting your initial compression out of them and you start leaking good amounts of oil past the rings. This causes more wear on the cylinders and piston skirts, but is not an immediate threat at blowing up your motor. 004 they are going to rattle and make noise sort of like a diesel engine does. Not only would it make noise it will also wear down the cams. 030 tappet to valve, that would make noise. If the motor had a terrible valve adjustment and there was. This could be attributed to a number of factors the most obvious would be too much clearance somewhere in a mechanical system. This is related to street cars, not race cars.Įngine noises. So I will go over some failures and how and why. The chances of blowing up a motor can be drastically reduced, as preceding failure symptoms occur such as engine noises, low oil pressure, engine overheating, won’t start, lack of throttle response, erratic behavior.

These are some of the more common problems you will see in Honda engines.

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