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Originally Posted by MattR
You Killed the motor?
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Of course. It was due for an oil change, so I figured "might as well spin a rod bearing!"
But seriously, I overheated it on Saturday... thought it might have been okay since it was running good on Sunday morning, but by the afternoon it crapped out.
From the miata thread on NASIOC:
Quote:
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Originally Posted by sperry
near the end of the first day, I overheated the car pretty significantly. My water temp gauge has an intermittently loose connection, so at some rpms the vibration of the motor causes the gauge to bounce around. Usually I can read through the bounce, but during my timed session I overheated it pretty good, then while coasting to try to cool the car I got caught from behind and had to get on it again to try not to ruin the lap of the guy behind me by getting to the next passing zone. So I ended up really putting the motor temp up in the red. Came in to the pits and the car had boiled over into the catch tank, and then overflowed the catch tank too. I ended up needing to add about a gallon of water to the radiator Sunday morning.
Sunday morning the car ran great, so I thought I had dodged a bullet. But in my timed laps Sunday afternoon, I went out w/ the motor making a little bit more noise than usual, and I only made it through the pace lap... I got down the front straight at speed and the motor let go. It suddenly lost all power... I was able to limp around back to the pits and when I came of track and pushed the clutch in, the motor promptly seized.
I'm pretty sure it's a rod bearing... at least that's what I would have guessed if it were a Subaru motor. But I had oil pressure on the gauge (after the motor seized, I checked the oil and it was only about 1 qt low) and the water temp was nominal. But as soon as the motor stopped the coolant boiled over, so there was some serious friction in there, hence my guess at losing a bearing.
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