Stolen from
www.supraforums.com... about how when you start your car you shouldt push the clutch in as the crank shifts and when you do that first thing, say in the morning, there is very little oil against where the crank sits and wears...
Hey everyone,
I've had a lot of people ask me why the crank walked in my motor, so after a bunch of investigation, I believe I know why it happened to Sean and I at nearly the same time.
Our aftermarket, and even the stock pressure plates pull considerably on the end of the crank when you press them in. Under normal driving conditions this is perfectly ok. But, under engine cranking conditions when you start your car it is not good at all. The reason for this is that the thrust bearing requires an oil wedge to protect itself. This oil wedge isn't there until adequate oil pressure is achieved once the car starts.
Both Sean and I have been tuning the AEM ECU for quite sometime now. He tuned his for about 2 weeks before I started. We both concentrated on the idle and driveability characteristics, and not startup. We spent quite a bit of time re-starting our cars. I probably restarted mine over 1,000 times and so did he. His crank walked about 2 weeks before mine did.
I don't believe it's related entirely to the aftermarket pressure plate, as I've run a stiffer pressure plate in my car since 1996 and this is the first this has happened. I also don't believe it's the fault of the AEM ECU. If you are tuning an AEM ECU, get the car to start quickly first, then concentrate on tuning. You can also add a switch to bypass the clutch safety switch so you can start it without pressing the clutch in. Some Toyota trucks actually came with this switch from the factory because cranks walked quite a bit in those trucks.
Hope this helps.
Take care,
Chris.
You can also add a switch to bypass the clutch safety switch so you can start it without pressing the clutch in. Some Toyota trucks actually came with this switch from the factory because cranks walked quite a bit in those trucks.
