I know these questions come up all the time, sorry. I have done a fair amount of searching over the last few days and haven't really found anything exactly comparable. I did find a video that sounded very very similar to the initial knock which actually came from a thread here previously but I can't seem to find that thread at the moment. Here's that video of someone else's car, I'll link the thread if I find it:
No definite resolution on that car so maybe the thread itself is somewhat irrelevant.
After a week or two of having the e30 running on megasquirt (and some hard driving as a result) I suddenly developed a knocking from the front of the motor:
Top end was suggested and since it's the easiest I went ahead and adjusted the valves this afternoon. They were definitely way off and I have no idea when this was last done as I've only had the car since September. The previous owner claims to have done a head gasket and judging by how clean the head itself is I'm inclined to believe him.
That makes me skeptical that this is top end related but I suppose I don't know the condition of any of these parts or the history of the motor.
Here's how it sounds after the valve adjustment:
It's definitely a lot better and for the first 20 seconds I ran the car I thought it was fixed.. and then it came back. I know the M20 is described as a noisy motor but I don't think it's supposed to sound like a diesel.
One of the rocker clips is pretty loose towards the rear of the motor but the noise is coming from the front so I'm not worried about that at the immediate moment but will certainly address it.
Any thoughts here? I'm going to continue looking into m20s with failing rod bearings to see if I can find a similar condition.
Also somewhat worrisome in regards to the crank: when pulling the plugs to make the crank easier to turn I noticed that bank 1 has been running richer than bank 2... would this then create some sort of variance in thrust between cylinders that would be problematic for the crank? When I got the megasquirt running originally I wasn't getting fuel on bank 1 at all so I know this is megasquirt related but again not primary concern at the moment.
No definite resolution on that car so maybe the thread itself is somewhat irrelevant.
After a week or two of having the e30 running on megasquirt (and some hard driving as a result) I suddenly developed a knocking from the front of the motor:
Top end was suggested and since it's the easiest I went ahead and adjusted the valves this afternoon. They were definitely way off and I have no idea when this was last done as I've only had the car since September. The previous owner claims to have done a head gasket and judging by how clean the head itself is I'm inclined to believe him.
That makes me skeptical that this is top end related but I suppose I don't know the condition of any of these parts or the history of the motor.
Here's how it sounds after the valve adjustment:
It's definitely a lot better and for the first 20 seconds I ran the car I thought it was fixed.. and then it came back. I know the M20 is described as a noisy motor but I don't think it's supposed to sound like a diesel.
One of the rocker clips is pretty loose towards the rear of the motor but the noise is coming from the front so I'm not worried about that at the immediate moment but will certainly address it.
Any thoughts here? I'm going to continue looking into m20s with failing rod bearings to see if I can find a similar condition.
Also somewhat worrisome in regards to the crank: when pulling the plugs to make the crank easier to turn I noticed that bank 1 has been running richer than bank 2... would this then create some sort of variance in thrust between cylinders that would be problematic for the crank? When I got the megasquirt running originally I wasn't getting fuel on bank 1 at all so I know this is megasquirt related but again not primary concern at the moment.
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