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It shows the base reading of 6 degrees BTDC for no vacuum to the advance unit. I can’t find a reference anywhere on readings for other conditions. This was a one or two year item that depended on the teapot with the spark control valve. In 1957 the whole system was dropped.

Stiggy - no. None of the reference manuals say anything about the correct vacuum readings except the reading of 6 degrees BTDC with vacuum advance shut off. But the ATDC reading may be correct anyway. In a regular system, when you check timing at idle, there may still be a small advance...

The fuel hose is a problem. If you route it under the bellcrank mechanism, it is getting pinched against the intake manifoold. How did the factory do it?

I was just about to look in the '56 parts book to check on that area. A missing spring (just broke and fell off most likely) would explain the problem. I put the hose piece there just to test my theory. I've been collecting and working on "older cars" for 40 years and this was one of the harder...

Jim - you’re right. See the attached picture. I stuck a piece of hose to block the kick down pin from sliding around. Car runs fine, plenty of power. Long term, I think a return spring in that area is supposed to keep tension on the linkage and it’s gotten weak after 63 years. (My Town Sedan is...

I discovered with the help of my wife that the throttle linkage is slipping at partial throttle. On the linkage to the rear of the carb, there is a hefty pin that goes through a curved slot which I think is the downshift activator at full throttle. My linkage is slipping that pin at partial...

Thanks! With everything connected, I see no advance at all. Someone commented in this thread that you won’t see any advance under no load conditions. There’s no centrifugal advance and the vacuum advance is related to lower vacuum conditions under load. It would be great if someone else could...

The only explanation I can come up with is that the spark control valve on the carb is not functioning correctly. It feels like the timing is just not advancing at all.

A few extra data points on my Loadomatic system. Timing results: No vacuum lines connected: 6 degrees BTDC All vac lines connected: retarded into ATDC range Ported vacuum only: same, retarded into ATDC range Manifold vacuum only: 6 degrees BTDC The problem I am trying to solve is a strange...

I have tried the "mouth suction" test on the NOS unit and it seems to respond properly. Even if it didn't, I can't see how the timing retards. Let me retest tomorrow to confirm the facts as I have stated them. I am pretty clear that revving the engine did NOT result in timing advance. This is...

Many thanks for the replies. Let me be a little clearer. The timing is set at 6 degrees BTDC with vacuum lines to the Loadomatic plugged. When I reconnect the two vacuum lines, with the engine still at idle, the timing retards into the after top dead center region. Revving the engine does not...

That’s higher rpms, not rooms!

Sal - many thanks, started right up, no thanks to Suntune. Bad news is that the replacement advance unit seems to be doing the same as the old unit. It retards the timing at idle but doesn’t advance it at higher rooms. Timing is sitting some number of degrees ATDC at idle. Suggestions?

Really counter-clockwise? I was using a Suntune Card that said “C” which I took to be clockwise! I will check on this. Thanks for the reply!

I recently determined that the dual vacuum retard/advance unit on my ‘56 Fairlane was no longer working. I have an NOS spare that I tested and installed today. Tricky to do on the car but it came out ok. Went to start — no dice. Car behaves like the timing is way off. I did not move the...