I over rev'd my s50 and in doing so, some valves floated, and I lost power. I guess that's what I get for not having a tach. Looks like a rebuild is in order. I haven't yet assessed the damage inside but I found the number 6 cylinder spark plug to be smashed in. Deffinately some bent valves and some good scaring on the pistons to be expexted. Too bad, I just got the car back and now I have to rebuild the bitch. Next time I'll make sure to have a working tach. I guess the car is going to be put up for a while, while I save up enough money to fix it.
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yikes. I guess that's one way to go. Time to build a high compression NA motor??Slicktop City! -
I wish I had the money... I guess I'll just have to save up. Put the car away for another year, and buy myself a daily beater. If only I had 10k dollars laying around.Comment
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What, it doesn't have a rev limiter?Comment
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This has nothing to do with not having a tach then. Driver error is at fault.Comment
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It has a rev limiter, obviously... but it was a first gear pull and I pushed it too hard, no money shift, I have the getrag 260 anyway. I am at fault. But I do need a tach so I can shift acurately instead of guessing when to shift. But it doesn't matter anymore cuz it don't work and I am officially depressed. I need money bad. And I dunno whether or not to just rebuild it stock or rebuild the whole motor since I'm already in there.Comment
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Bummer dude.
I don't think I've ever heard of someone over revving the engine just doing a first gear pull on stock software with a engine speed limiter.
You sure you didn't just drop a valve? It happens on <10/95 S50 engines. The valve keepers pull through the retainers sometimes, usually on cars that have been tracked or wrung out daily.
Anyway, you certainly don't need 10k to do a rebuild. Pull the engine and see what happened. If you are super lucky you might be able to just do a minor rebuild. You might need a new head casting, which you can pull from either an S50 or M50. Hopefully the bores in the bottom end aren't scarred.
Worst case scenario just swap in an M50. You can get the bare engine for around $500. You already have all of the accessories and the wiring harness. All you need to do is source M50 software, which you can usually get used for around $40 (for a stock chip).
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Is someone trying to hide the truth?91 m3Comment
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How can you overrev if you take off in 1st, dont shift, and you have the stock revlimiter? And why do you have to rebuild? If you just want the car to run for a while till you save for high compression NA stuff just find a good used s50 head and put it on as long as the pistons arent hurt too bad.
WillRIP e30 (brilliantrot '91 325i) 11/17/06 Byebye: 8/21/07
Welcome e30 (brilliantrot '90 325is) 12/23/06
DaveCN = Old Man
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Originally posted by george gravesComment
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I'm not hiding the truth, what's there to hide... I'm blaming myself. I'm using a turner chip(rev limit increased to 7200 i believe) cuz I have lots of goodies on the motor, nothing internal. I'm going to pull the head off and assess the damage. When I got it running tho, it had some tapping, like the valves needed to be adjusted, but was coming from the front of the motor. I thought maybe the timing chain was loose. I didn't do anything about it, cuz I just got it running and I'm dumb.Is someone trying to hide the truth?
But when I pulled the sparkplugs, the #6 cylinders plug was smashed, I check the possition of the timing chain, with the front harmonic balancer on o/t and the arrows on the timing sprockets pointed up like they are supposed to. So I do not think timing is off, just a valve dropping so far. the sound I got before I turned the motor off was a clack, clack, clack, clack. so something is deffinately hitting the pistons, but from the top of the head, everything looks good. I'll update later.Comment
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That was just your vanos unit it usually sounds like marbles in a coke can or atleast to that affect.
This is a classic problem with this motor, you can bend valves just by free revving to redline especially if the valvetrain hasnt been freshened up . I have a customer in right now for 6 tornado twisted valves all on the cyl 3-6 exhaust valves . I found one totally shattered keeper 2 beat up ones and 6 retainers that were stretched out. Worst part about it is he just got his car back after i converted it to 5-speed.Comment
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