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Joined: Jul 2008
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Oil Can Mechanic
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Oil Can Mechanic
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i have noticed that under acceleration in any gear the valves really chatter. is this due to the timing needed adjusted? i first thought it was the grade of gas i was using but now i'm using reg unleaded only. the motor has excellant pickup. there is no noise when i let up on the gas, but the annoying valve noise under a load is too much. should i adjust the distributor a degree forward or retard? any suggestions would be helpful...kwhite
Ken's 1940 Special Deluxe Sedan
1970 Cadillac Hearse
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Joined: Nov 2001
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ChatMaster - 15,000
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ChatMaster - 15,000
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I expect your valve cladder on acceleration is spark knock and not valve noise. Valve noise is rpm dependent but never found it to be worse on acceleration vs deceleration. Of course I have only been driving these old Chevys for 50+ years and still learning.
How Sweet the roar of a Chevy four!
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Does your car start hard or turn over slow when it at operating temperature? This would be another indication of the timing being to far advanced. Detonation can kill a engine really fast, I'd be on top of finding out more about this noise you have under acceleration.
Don
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ChatMaster - 6,000
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KW, check the timing for TDC and adjust the rockers. If that doesn't take care of the chatter, check for squirrels. Best, Charlie
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Joined: Jul 2008
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Oil Can Mechanic
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Oil Can Mechanic
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don, the car starts fine, no slow grind at running temps. i expect that the problem might be the octane selector that needs to be adjusted. but i'm not sure of how to do it. does it need to be retard a notch?
Last edited by kwchevy1940; 11/21/09 06:49 PM.
Ken's 1940 Special Deluxe Sedan
1970 Cadillac Hearse
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Joined: Dec 2001
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Technical Advisor ChatMaster - 10,000
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Technical Advisor ChatMaster - 10,000
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Mark or remember where the current setting is on the Octane Selector. RETARD the setting on the selector and then give it a test drive. If it changes the noise, experiment with various settings that cures the noise and does not affect the starting ability.  
RAY Chevradioman http://www.vccacolumbiariverregion.org/1925 Superior K Roadster 1928 Convertible, Sport, Cabriolet 1933 Eagle, Coupe 1941 Master Deluxe 5-Passenger Coupe 1950 Styleline Deluxe 4-Door Sedan 1950 Styleline Deluxe Convertible 2002 Pontiac, Montana, Passenger Van 2014 Impala, 4-Door Sedan, White Diamond, LTZ 2017 Silverado, Double Cab, Z71, 4X4, White, Standard Bed, LTZ If you need a shoulder to cry on, pull off to the side of the road. Death is the number 1 killer in the world.
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Joined: Jul 2008
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Oil Can Mechanic
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Oil Can Mechanic
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thanks ray, i'll try that first thing in the morning...hopefully i'll have some luck. kwhite
Ken's 1940 Special Deluxe Sedan
1970 Cadillac Hearse
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