Yet more questions. Pics for help.

[New2me69]

Working my list of things to do to the engine bay cleanup/tune project that I'll be diving into in the next while and came up with a couple more questions.

1. The bubble gum weld

The previous owner hacksawed the manifold to eliminate the heat risers. I will be replacing this but I'm confused by this act. If it was plugged, why not just leave it plugged and attached as opposed to cutting the riser off and welding the muffler opening shut. I don't know/get that.

So my first question is; is my muffler f$#%ed or can I grind off the weld evenly and drill a hole back out to accommodate a new functioning manifold? The muffler doesn't leak at this time and if I can save a couple of bucks by not having to buy a new one that would be great. Is it possible?


2. The mystery line.

I already know that the throttle positioner is connected as it should be but isn't working properly at this time (I will try and repair it) but I'm at a loss as to what that second line (the one with the nut plugging it off) just below it is for. I looked for another vacuum line/connection elsewhere and there is nothing (not even on manifold as with two stage positioners).

So my second questions is; What the heck is it? Haha Any help would be awesome on this one. I have no idea.

Cheers as always!

[New2me69]

Anyone?

[Q-Dog]

[airschooled]

#2 to me certainly looks like one of those aftermarket EGR add-ons that were popular in the '70s and '80s. My other guess is that its a manifold vacuum nipple added under the carb to fit the engine into an auto-stick with an intake manifold that doesn't have the right vacuum fittings for it. You may safely remove it.

--

As far as the throttle positioner goes, at idle:
- loosen small lock screw
- turn big screw clockwise until you get movement from the arm
- rev engine to 3,000-ish RPM
- let off throttle and count seconds to idle
- adjust big screw until you get 3-6 seconds at 3,600 RPM
- tighten small locking screw

The throttle positioners on these cars are VERY fickle. 1/16th of a turn is often all it takes to upset the adjustment. On the plus side, once it's set, it's pretty much set for the life of your engine's vacuum signal. I swapped camshafts in my engine last year and had to do half a turn, which is a big adjustment. I have only seen one bad single-piece positioner in my years of collecting and restoring them.

Before that, perhaps hold the throttle positioner arm back so you get the "throttle positioner fast idle" and set the secondary screw/arm assembly to 1,200-1,400 RPM. I forget which order of operations Bentley requests.

Good luck, and let us know how it goes.
Robbie
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[beetlenut]

#2 Might have gone to an Altitude compensator. The Altitude compensator would have been mounted on the upper part of the engine compartment fire wall driver's side.
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[wcfvw69]

[57BLITZ]

[New2me69]