Volvo RWD 140-160 Forum

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why does the FSM call for smaller valve adjustments for the F compared to the B?(and stuff) 140-160

posted by  someone claiming to be B20Paul on  Sat Sep 25 04:55 CST 2004 [RELATED]

The running clearance is a fairly arbitrary figure that a cam designer starts with. A & D grinds are designed to run with .012" of clearance when measured at the lobe, the C grind is designed to run with .015". A B20 rocker ratio is close to 1.5 so you should run with .012" * 1.5 = .018" at the valve for A & D grinds & .022" for the C grind. Overly tight exhaust clearence will hurt fuel economy & bottom end torque, overly tight intakes hurts power & economy everywhere. A, C & D grinds have linear clearence ramps, so always err on the loose side.





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New why does the FSM call for smaller valve adjustments for the F compared to the B?(and stuff) [140-160]
posted by  KLR142  on Wed Sep 22 15:20 CST 2004 >


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