He followed by stating that he would have preferred a compression ratio of 10.25:1, a camshaft with 041 valve timing, slightly richer carburetor jetting, and as much
vacuum advance as the engine would tolerate.
OIL LIGHT ON OR GAGE LOW P PCV Valve Q R RADIATORS: Car and Truck RICH: Car runs rich S SEALS AND GASKETS SERVICE ENGINE SOON LIGHT SPARK PLUGS STARTERS: Auto, Truck T THERMOSTATS TIMING: IGNITION TIMING TIMING BELT & TIMING CHAIN TIRE REPAIR TRANSMISSIONS: AUTOMATIC TRANSMISSIONS: MANUAL U
V VACUUM ADVANCE WARNING LIGHTS OR «IDIOT LIGHTS» Car Washing and Care W WATER PUMP REPAIR WINDOWS AND WINDSHIELDS WIRING REPAIR X Y Z
The horsepower was increased to 185 hp by outfitting the cars with the «red box» APC controller, a 2.8 - bar fuel pressure regulator (base turbo was 2.5 bar), and a distributor with
enhanced vacuum advance.
The engine has been modified to accept an Edelbrock carburetor and a «
vacuum advance style» ignition system.
I replaced the points and
vacuum advance can a couple years ago and set the dwell.
Does your engine also have
a vacuum advance?
The miss - fire gets more aggressive, to the point that the engine stalls it self if I have
the vacuum advance on, even with the ignition fully retarded.
This model does not have counterweights or
vacuum advance.
Are you checking the timing with
any vacuum advance disconnected?
A classic from the muscle - car era might have just three vacuum lines: one each to
the vacuum advance on the distributor, the power brake booster and the automatic transmission modulator.
When asked about the compromises for the production SD455 engine, McCully responded, «Compression, camshaft, jetting, and
vacuum advance.»
Beside the fuel - injection, a significant change for the Z24i was the addition of an optical crank angle sensor in the distributor rather than
a vacuum advance and ignition module.
The 2CV used the wasted spark ignition system for simplicity and reliability and had only speed - controlled ignition timing,
no vacuum advance taking account of engine load.
Vacuum advance distributor replaced with a centrifugal unit.