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RWD - 1974 B20F timing question

Volvo RWD 140-160 Forum

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1974 B20F timing question 140-160

Does anyone have a 1974 140 series Green Book? Can you look up the recommended timing advance in that for me?





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    1974 B20F timing question 140-160

    I had the whole 1974 Volvo green book on a now failed hard drive.

    I can't find where I originally downloaded it, but I do have my own original hard copy.

    The factory ignition specs for a 1974 B20F are 10° BTDC at 600-800 rpm with 94 octane.

    However, you will probably want to customize that to accommodate the fuel you can get locally.


    --
    Eric
    Hi Performance Automotive Service (formerly OVO or Old Volvos Only)
    Torrance, CA 90502





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    1974 B20F timing question 140-160

    I don't have the "green book" but other sources. Set the timing to 10 degrees BTDC at idle with the vacuum retard disconnected (if it has that system). I set my timing for maximum advance--run the engine to about 3500rpm and set the timing to a max of 35 degrees--less if you use regular gas. -- Dave





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      1974 B20F timing question 140-160

      I like to disable the big spring completely by bending the tab for it in so it never comes actually works. Most of the stock distributors have the last bit of timing come in very slowly at high rpms, most likely because 1970's fuel was so sub par. If the little spring is OK, adjust it so the curve starts at 1000 crank rpm's and it should be all in before 3500 hopefully and have a stabile idle. With mild cams like K, D, VV-61 & VV-71, you can pick up a bit of torque around 2000-3000rpm, but if it pings in this range tighten the spring slightly in stages. After 3000rpm you want no pinging because this is starting to get close to peak BMEP & torque, and pinging here can rapidly become detonation and then tears with your compression ring in multiple pieces.





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