Volvo RWD 120-130 Forum

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Hi-Octane? 120-130 1967

posted by  someone claiming to be Jim Hampton on  Mon Aug 30 16:45 CST 2004 [RELATED]

I think the 140 has a vacuum retard. If I read your post correctly, it probably has a centrifugal advance to deal with increased piston speed (John's explanation above)and the vacuum retard interferes with the advance at low speed when the throttle is closed. The open throttle then allows pressure to go to atmospheric, there is no vacuum, no retard and the centrifugal advance is allowed to function. Is that it, sort of?

Jim Hampton






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New Hi-Octane? [120-130][1967]
posted by  Pooch  on Mon Aug 30 08:16 CST 2004 >


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