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Why 2 knock sensors on the L67?


Octavarium454

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I guess I could really care less, but I just finished installing the new fucking engine in my car and I couldn't find where this one wire went. Well, it turns out that this wire went to a knock sensor that someone had fucking busted off the threads inside the block. So now I'm forced to drill the thing out unless you guys can tell me I only need the one in the rear, but I'm assuming there are two for a reason and I'll be drilling that thing out tomorrow. Fuck.

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Well just to see if it ran I left it unplugged and it did not pop any codes. However I got it in now and I must say, the L67 runs a lot better without a spun bearing and a burnt exhaust valve on cylinder #2 :burnout:

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I was about to say, I went out and checked that head again and everything and yeah, it is the exhaust valve. My e-cred was almost destroyed there, close call :lol:. And am I the only one who calls that a "burnt" valve around here?

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I was about to say, I went out and checked that head again and everything and yeah, it is the exhaust valve. My e-cred was almost destroyed there, close call :lol:. And am I the only one who calls that a "burnt" valve around here?

 

It's cracked, right?

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Intake valves are always the bigger one because you need a bigger area for air to be sucked in. Exhaust valve can be smaller because the exhaust is being pushed out by the piston - so it's going out one way or another.

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Intake valves are always the bigger one because you need a bigger area for air to be sucked in. Exhaust valve can be smaller because the exhaust is being pushed out by the piston - so it's going out one way or another.

 

the fact that the exhaust gases are still expanding when the valve starts to open helps as well.

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