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Timing advance vs vacuum old V-8
Technical question about timing vs vacuum on old V-8s:
I have a '72 350SL with the M117 D-Jet V-8. I set timing yesterday to max advance which seems to work for this engine - about 5degBTDC at idle with vac. I did not take meticulous readings, but I think obtained maximum vacuum at the above timing settings. I saw as much as 20" briefly, but I think it settled at about 18". But, when I backed off on advance, the vacuum dropped off. I must re do this, but it seemed to me that with timing at TDC with vac at idle, I had low vacuum - maybe 10-12". If I had set it to 5degATDC, I doubt I would have seen much vac. Does anyone know what the vacuum readings for this type of engine should be with different degrees of advance/retard?
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Graham 85 300D,72 350SL, 98 E320, Outback 2.5 |
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