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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Mon, Mar-19-2018, 10:12:41 PM   #11
Braymond141
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Default Re: What's wrong?

Quote:
Originally Posted by Ajcanadian View Post
He doesn't remember the actual numbers but cylidner 4 and 5 were close to 20
Well thereís your answer. Likely money shifted motor.

Iím not sure I would say he didnít respect your car without more info. If yours is not properly maintained it would be easy for this to happen.
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Old Mon, Mar-19-2018, 11:02:51 PM   #12
Ajcanadian
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Default Re: What's wrong?

Quote:
Originally Posted by Braymond141 View Post
Well thereís your answer. Likely money shifted motor.

Iím not sure I would say he didnít respect your car without more info. If yours is not properly maintained it would be easy for this to happen.
I know the car sat for 2 years and I was catching up to the maintanace. What else can money shifting do to the motor?
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Old Mon, Mar-19-2018, 11:19:27 PM   #13
westopher
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Default Re: What's wrong?

Its a mechanical overrev that will mash pistons into the valves. It will pit the pistons, bend valves and can cause damage to the head.
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Old Mon, Mar-19-2018, 11:50:57 PM   #14
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Default Re: What's wrong?

95 M3 seem to have more spring/retainer issues than 96-99M3. It could have been a failure just waiting to happen. And if you had a worn out linkage, a money shift might have been waiting to happen as well. Itís a 23 year old car and the OP acknowledges it was neglected and was parked for a while. Redoing the head was going to be necessary before long anyway.
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Old Tue, Mar-20-2018, 01:49:42 AM   #15
betrezra
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Default Re: What's wrong?

Dont trade cars w anyone except wife and/or girlfriend,
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Old Tue, Mar-20-2018, 05:50:23 AM   #16
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Default Re: What's wrong?

Play stupid games, win stupid prizes...
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Old Tue, Mar-20-2018, 01:45:42 PM   #17
Double E
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Default Re: What's wrong?

A money shift will leave the marks on the tops of a few pistons. Nothing else would, right?
That will say what was occurring at the time... A borescope for android phones is cheap.
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Old Tue, Mar-20-2018, 02:46:48 PM   #18
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Default Re: What's wrong?

And probably bend valves. I did one once. Drove the car home from the drag strip but thevudle was no longer smooth due to the bent valves. Really bad mis shift can snap the heads off valves and they can rattle around the chamber and get wedged between piston and head and damage one or both.
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Old Wed, Mar-21-2018, 01:49:59 PM   #19
MaynardZed
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Default Re: What's wrong?

You can even punch a valve through the top of a piston of you hit just hard enough.
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Old Thu, Mar-22-2018, 08:27:20 PM   #20
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Default Re: What's wrong?

Here's a question I never understood.

How does the overrev lead to valve/piston contact? If the timing chain connects the crank and cams, wouldn't the top end spin at the same speed as crank?

Valve spring rates exceeded?
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Discussing What's wrong? in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)