Noisy 383
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Joined: Nov 2005
Posts: 536
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From: Bardstown Kentucky
Noisy 383
I was running 15 w40 Shell Rotella for break in.
http://www.shell.com/home/Framework?...ntro_1006.html
After changing the oil to 10w30 Mobil 1, the engine seems to have gotten a lot nosier, piston slap. It is really noticeable on cold start up. I know that forged pistons are prone to make noise, plus the Mahle pistons I am running have almost no skirt at all. After the engine warms up the noise is almost completely gone. The piston to wall Clarence was somewhere between .002-.0025. A .002 feeler gauger would fit but a .0025 would not. Mahle calls for .002-.003 depending on what you are doing with the motor.
Also, using my mechanics stethoscope, it seems like the valve train is louder using the thinner oil, lifters, roller rockers, etc..
Any thoughts?
http://www.shell.com/home/Framework?...ntro_1006.html
After changing the oil to 10w30 Mobil 1, the engine seems to have gotten a lot nosier, piston slap. It is really noticeable on cold start up. I know that forged pistons are prone to make noise, plus the Mahle pistons I am running have almost no skirt at all. After the engine warms up the noise is almost completely gone. The piston to wall Clarence was somewhere between .002-.0025. A .002 feeler gauger would fit but a .0025 would not. Mahle calls for .002-.003 depending on what you are doing with the motor.
Also, using my mechanics stethoscope, it seems like the valve train is louder using the thinner oil, lifters, roller rockers, etc..
Any thoughts?
