Need help diagnosing a noise
Need help diagnosing a noise Hey guys need help figuring out what this sound might be, anyways went to track last night made 7 or so passes, missed 3rd once and over reved it by accendent. Got home pulled in the garage and heard this noise. Car is Cammed and has all supporting mods for it, pulled the valve cover off the driverside and everything looked and felt fine, i even lubed up the pulleys just to eliminate that. I cannot pinpoint the exact location of the sound just know its coming from the driver side of the motor. I used a stethoscope and couldnt find nor hear the same noise, but when i took the stethoscope out of my ears i could still here the noise. I searched every where on the engine coulndt find anything with the stethoscope, i have noticed it only does it when the motor is warmup. Doesnt effect performance, but i dont want to drive with that sound until i know what it is. All info would be apperciated!
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What about the passenger side? I had this same problem unfortunately I ended up tracking the problem around the engine unable to pin point. After changing lifters the noise was still there. Ended up pulling the motor out of frustration and found a bent rod. It was running fine sitting in the garage one loud bang under the hood and that was all she wrote. Same noise mine had a ms4 and everything to support it. Was told by the people who built the engine it was caused by detonation in the cylinder. Hope you don't have this same problem just figured id give you something to think about.
a few rockers have the slight play, wiggle from side to side, only when that valve is closed. Just to be safe i will re torque to spec. but everything else seems fine
What about the passenger side? I had this same problem unfortunately I ended up tracking the problem around the engine unable to pin point. After changing lifters the noise was still there. Ended up pulling the motor out of frustration and found a bent rod. It was running fine sitting in the garage one loud bang under the hood and that was all she wrote. Same noise mine had a ms4 and everything to support it. Was told by the people who built the engine it was caused by detonation in the cylinder. Hope you don't have this same problem just figured id give you something to think about.
I'd start cheap and check pr and lifter adjustment on both sides. I could have sworn my noise was in the passenger side head area and come to find out it was in the bottom. But it's free to pull the valve covers and check.
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Ya i planned on pulling the rockers and pushrods off today, i just dont know what size the crank pulley bolt is to turn the motor over by hand to close the valves
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Verdad Gallardo Pulled both covers off, all rockers and pushrods are good. Put them all back on tq. them to spec and let it idle same thing. So next thing maybe pull the heads and check out the lifters out. Even thou it has ls7 lifter one might have a sound to it. Cheapest way at the moment.
Yeah man that's the next step. This is to familiar for me I was on and off with the heads had them checked for a bent valve which may also be something your want to do while it's apart. I pulled a ls7 lifter apart and although people say they do fail I really don't see how unless your pr were too long and you were on it like that over reving and such. Just my opinion. In my case the bottom of the piston was rubbing the counter weight on the crank. It would def be worth either pulling the plugs or while the heads are off (just so compression isn't building) turning it over and feeling it. I could tell right away something was rubbing when I did this.