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weird noise

 
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jamez  
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PostPosted: Thu Aug 09, 2001 6:06 am    Post subject: Reply with quote

I was drag racing my car against my friends honda prelude si, and noticed my engine starts making a really weird noise at a little under 6000 rpm, I only heard it for half a second (I wasn't gonna keep my car at redline and blow it up just to see what the noise was) , so I don't really know how to describe it, maybe really loud pinging? I also have an exaust leak that rattles and makes noises, could it be that that all of a sudden it just gets really loud at 6000?
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jamez  
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PostPosted: Thu Aug 09, 2001 6:07 am    Post subject: Reply with quote

oh I forgot to say that my engine was rebuilt 2500 miles ago and runsa perfectly..
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larso  
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PostPosted: Thu Aug 09, 2001 9:50 am    Post subject: Reply with quote

LOL what gas does that require, what gas do you use, and how is your mixture, do the headers glow?
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924RACR  



Joined: 29 Jul 2001
Posts: 8114
Location: Royal Oak, MI, USA

PostPosted: Fri Aug 10, 2001 12:10 am    Post subject: Reply with quote

Yeah, I'd be willing to bet it was an odd resonance... maybe even exhaust... try spooling it up again, see what it's like and if it'll still do it.

Did you balance the rods and pistons? I did so when re-ringing the engine in my racecar (otherwise quite stock), and it has survived numerous over-revs to 7 grand or so no problem. Balancing makes quite the difference.

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Vaughan Scott
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'79 924 #77 ITB racecar
'82 931 Plat. Silver
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