[DML] Continued: No Smog Pump on DeLo PRV

["content22207" <brobertson@xxxxxxxxxxxx>]

Relative to recent discussions Re: no smog pump for DeLo catalytic
converter:

While in the junkyard today I studied closely a 1989 Volvo 760 GLE
(which curiously has a B28F, not a B280). It has a single *LARGER*
converter after the Y pipe, and a cam driven air pump (the fellow who
told me the hole in my B27F valve cover is for a fuel pump was wrong
-- it's for an air pump. What I assumed at a glance is an air pump is
in fact an alternator with large diameter pulley/internal cooling fins
-- this car has the same funny alternator in the same location). So
apparently Volvo never was willing to run converters off its PRV's
without additional air in the exhaust stream. This car is Lambda'd BTW
(with the frequency valve attached to the same bracket that holds the
idlespeed microswitch!).

JZD's smog pump-less exhaust may operate at the threshhold of problems.

Note also this car, while CIS, has three non-shear head (adjustable)
screws in its manual idle speed circuit. The balancing screws weren't
snugged down, but the inlet screw was.

Bill Robertson
#5939








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