valvetrain "chirp" - Team Camaro Tech
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post #1 of 7 (permalink) Old Mar 10th, 02, 02:55 AM Thread Starter
 
Join Date: Mar 2002
Location: Verona PA USA
Posts: 15
I just rebuilt a 350, 30 over, new SR Torqer cast iron heads, 2.02 intake valves, 1.250" single spring 100# seat, 67 cc chamber, Comp Cams 238 hydraulic cam, 262 adv duration, .462 lift. 110 separation. I used stamped steel 1.5 rockers with slotted pivot balls.
After the engine warms up, I get a "chirp" which sounds like a belt chirp but it isn't. I can narrow it down to a couple of valves and by adjusting the nut 1/8 turn either way, the "chirp" goes away, but it soon returns. I have replaced the slotted balls with smooth balls and everything was ok for about 50 miles, then the "chirp" came back. It was suggested that I go to roller rockers but they are expensive and my machinist is not sure if this will solve the problem. Any one ever have this "chirp" in their valve train. Any help is appreciated. Thanks
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post #2 of 7 (permalink) Old Mar 10th, 02, 07:01 AM
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scott
 
Join Date: Mar 2001
Location: alpharetta, GA. 30004
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I had a problem similar to what your saying and it was from a lack of proper oiling. How is that set of pushrods and rockers looking as far as lubrication goes?

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SCOTT
69 RS-SS 396 4-SPEED
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post #3 of 7 (permalink) Old Mar 10th, 02, 09:05 AM Thread Starter
 
Join Date: Mar 2002
Location: Verona PA USA
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The pushrods are new and so is the high pressure oil pump. At idle the guage reads about 30 psi when the engine is cold. When the engine is hot it is about 10 psi. With the engine running (hot) at about 600 RPM the oil is coming out of the pushrods but not with much force (it sort of oozes out of the pushrod), but the valley of the rocker where the ball is, is filling with oil. Revving th engine does make the oil squirt all over the place. The chirp is not there when the engine is cold, its only after it warms up. Another mechanic looked at the oil and said it looked normal. You stated that your problem was a lack of proper oiling. Could you elaborate on this. Thanks.
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post #4 of 7 (permalink) Old Mar 10th, 02, 12:40 PM
 
Join Date: Nov 2001
Posts: 138
With the added lift of your cam, your push rod may be hitting the end of the slot where it comes thur the head.
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post #5 of 7 (permalink) Old Mar 10th, 02, 02:42 PM Thread Starter
 
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Location: Verona PA USA
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Thanks for the idea. I'll have to check tomorrow to see if there is interference between the pushrod and the rocker at full lift.
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post #6 of 7 (permalink) Old Mar 11th, 02, 05:40 PM
 
Join Date: Feb 2002
Location: waterloo
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I would check Head gasket I had a motor with a loud "chirp".It was the head gasket.I too thought it was in the top end
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post #7 of 7 (permalink) Old Mar 12th, 02, 10:13 AM Thread Starter
 
Join Date: Mar 2002
Location: Verona PA USA
Posts: 15
How did you narrow it to the head gasket, Were you losing coolant? If it was the head gasket, why would tightening or loosening the nut(s) on the rocker arms make the chirp go away (at least for a little while).
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