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Simple test Is the frequency solely dependent on speed, or RPM. Of its speed I agree with the above, CV joints. If its RPM there can be a whole slew of causes ranging from disintegrating timing belt to lifters and a zillion things in between.
In the 1970s I bought a really hot car, a Simca Ti, which had the engine from a Matra. Unfortunately the engine was too powerful for the axles and on a vacation in Austria we got the dreaded ticking noise from the front CV joints. We spent 3 days and nights in a campground without a car before they had the car fixed.
Its a very distinctive noise and is dependent on the load on the joints, so my bet is on the above.
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2004 Boxster S Silver - FUNTOY
2002 Boxster Base Guardsy Red - FUNBOX
1987 Caterham Super 7 1700 Supersprint
2009 Mercedes Benz CLK 350 convertible
1941 Dodge Luxury Liner Coupe
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