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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 Thu, Mar-22-2018, 11:20:03 PM   #21
Solaris99
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Default Re: What's wrong?

At extremely high speeds, the springs don't react quickly enough to pull the valves back before the piston meets them.
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Old Fri, Mar-23-2018, 07:13:56 PM   #22
frbz
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Default Re: What's wrong?

I believe it is called valve float
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Old Fri, Mar-23-2018, 10:15:39 PM   #23
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Default Re: What's wrong?

Valve float and I would also think the tensioner loaded timing chain has a reaction limitation (forcing into the wrong gear shoots the rpm up quickly) and speed limitation.

Money shifts can also spin the oil pump nut off. The rebuilt motor in my 96 came from my cousin's car who did this. Chewed up the crank and the cams were goners due to the oil starvation. There were only 12 bent valves and they were mild.
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Old Sat, Mar-24-2018, 03:44:12 AM   #24
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Default Re: What's wrong?

gives you a great reason for a project. The s50 around 150k of abuse should be refreshed at least. Good luck!
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Old Sat, Mar-24-2018, 04:20:27 PM   #25
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Default Re: What's wrong?

Alright guys the heads off. Pistons had no damage. But in the gasket there was some valve seat. Machine guy things its the valve guide. But it has more tear down to go.
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Old Sat, Mar-24-2018, 05:24:05 PM   #26
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Default Re: What's wrong?

Screenshot_2018-03-22-23-31-58.jpg
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Old Sat, Mar-24-2018, 05:26:48 PM   #27
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Default Re: What's wrong?

https://drive.google.com/drive/folde...eY?usp=sharing

For some odd reason I cannot upload the remaining pics. So, I've attached a link to a google docs that I'll be updating
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Old Tue, Mar-27-2018, 04:53:04 PM   #28
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Default Re: What's wrong?

Quote:
Originally Posted by westopher View Post
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.
The pistons looked fine. Machine shop hasn't taken the head apart yet. But he thinks it's bad valve guides.
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Old Tue, Mar-27-2018, 04:53:30 PM   #29
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Default Re: What's wrong?

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Originally Posted by bip_m3 View Post
gives you a great reason for a project. The s50 around 150k of abuse should be refreshed at least. Good luck!

Yessir, The head's out to the machine shop but it sucks that the m3 is my only car.
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Old Tue, Mar-27-2018, 04:54:39 PM   #30
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Default Re: What's wrong?

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Originally Posted by Braymond141 View Post
Valve float and I would also think the tensioner loaded timing chain has a reaction limitation (forcing into the wrong gear shoots the rpm up quickly) and speed limitation.

Money shifts can also spin the oil pump nut off. The rebuilt motor in my 96 came from my cousin's car who did this. Chewed up the crank and the cams were goners due to the oil starvation. There were only 12 bent valves and they were mild.

Quick side question for ya. So on the m3 whenever I opened the expansion tank it had pressure in it. Even if the car was cold. The day before the compression test while the car was running and driving great a radiator hose popped off. Does this have any connection to my cylinder 4 & 5 having low compression?
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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)