NEED HELP FAST!!

B16, B18, B20
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NEED HELP FAST!!

By poorman type-r
- Thu Nov 11, 2010 2:26 am #222518 Alright so someone wanted me to post a question for them since they dont have a account.

I guess he was driving his hatch with a b18c1 and it was driving perfectly fine for about a month, he drove it slow never going passed 4k. It has a 11.5:1+ comp. and he was running on 91.

I guess today while he was driving there was a loud rattling noise. So, when he got home he popped the hood and revved it up from the throttle and the motor made a very loud rattle sound. I know its hard to sit here and read this and have an idea of what this might be, but does anyone have an idea what it could be? it is coming from the motor. btw.

Also would not having a knock sensor lead up to this problem?

Any help would truly be appreciated. Thanks.
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By Greasedmonkey
- Thu Nov 11, 2010 2:30 am #222519 It could be anything. Whay kind of sound is it? tick or knock?
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By poorman type-r
- Thu Nov 11, 2010 2:37 am #222520 I guess he says its between a knock and a rattle.

He is in Fresno so i cant be there to hear it for myself i am just going off what he is telling me.
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By poorman type-r
- Thu Nov 11, 2010 3:15 am #222523 He also told me that it was making a low tapping noise a few days before the loud rattle and knock came.
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By Greasedmonkey
- Thu Nov 11, 2010 6:23 am #222538 spun rod bearing would be my guess.
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By Cl9junky
- Fri Nov 12, 2010 1:39 am #222623 Is it stock? Once a while back when i had my Dc2 i got the motor built up and a few days later it started making knocking noise come to find out the cam gears bolts came loose and was banging against the valve cover. I was lucky i didnt have my valve cover cam cover portion cut out. It saved me ass.
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By 93hatcheg
- Fri Nov 12, 2010 6:33 am #222652 sounds like a spun rod bearing to me, a few days ago when the tapping niose started was when it spun and then since he kept driving the bearing got looser and looser and the noise got louder and louder. thats my best guess.

sucks tho cause if thats the case the crank is gonna have to be machined and thats just short of a motor rebuild, there would have been a slight chance to save it if the problem would have been fixed as soon as it started but then again thats all assuming it is a spun bearing.
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By poorman type-r
- Fri Nov 12, 2010 9:41 am #222658 Yeah I will have to agree on the spun bearing, I mean the other things you guys are saying could be right, but if anything he iz going to have to strip it down and re build it. Oh well, shit happens. :?
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By poorman type-r
- Fri Nov 12, 2010 9:47 am #222659 What are the causes of spinning a bearing? Only thing I have heard is oil starvation.
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By jred
- Fri Nov 12, 2010 3:33 pm #222673 thats sounds like the same thing that happened to me with my B20vtec.
The noise sounds like a bolt was rattling round the head when i rev up pass 3k rpm..it turn out to be a bent valve, i tought it was the bearing also but when we ripped the block apart the bearing was fine..I also experienced the engine breaking up "sounds like a subaru" when the noise came in...
the cause of that was becuz i gave my brother the car to change the oil for me cuz i was working 14hrs a day, and he used the wrong body oil..which f'ed up the valves.. :x
don't know if its the same as yours but there's a chance :?
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By 93hatcheg
- Fri Nov 12, 2010 7:33 pm #222696
jred wrote:the cause of that was becuz i gave my brother the car to change the oil for me cuz i was working 14hrs a day, and he used the wrong body oil..which f'ed up the valves.. :x
don't know if its the same as yours but there's a chance :?


i dont see how a different oil can cause valves to bend, that doesnt make sense at all. oil is a lubricant.

as for causes of rod bearings being spun, yes oil starvation is a main one, however what causes the oil starvation is the next thing to ask. one is reving your motor to the moon with it not in gear or the clutch pushed in.
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By Eg6H2D
- Fri Nov 12, 2010 10:43 pm #222707
93hatcheg wrote:
jred wrote:the cause of that was becuz i gave my brother the car to change the oil for me cuz i was working 14hrs a day, and he used the wrong body oil..which f'ed up the valves.. :x
don't know if its the same as yours but there's a chance :?


i dont see how a different oil can cause valves to bend, that doesnt make sense at all. oil is a lubricant.

as for causes of rod bearings being spun, yes oil starvation is a main one, however what causes the oil starvation is the next thing to ask. one is reving your motor to the moon with it not in gear or the clutch pushed in.


Exactly!! :thumb:
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By chilango41
- Fri Nov 12, 2010 10:52 pm #222708
jred wrote:The noise sounds like a bolt was rattling round the head when i rev up pass 3k rpm..it turn out to be a bent valve, i tought it was the bearing also but when we ripped the block apart the bearing was fine..I also experienced the engine breaking up "sounds like a subaru" when the noise came in...

:oops: :oops:
My car does the exact same thing :thumbdown: :thumbdown:
Im going to check that out!!
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By poorman type-r
- Sat Nov 13, 2010 8:23 am #222746 Hmmm well he is saying he hasn't taken it past 4k but at the same time that is going from what he is saying. So after everything is said and done, how much would it be to get it running again?
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