[TR] Vacuum Advance of a delco remy

[John Innis]

What carb are you using and where on the carb is the vacuum line
connected?  DGV's are notorious for this, because carb vacuum line is NOT a
manifold vacuum source, it is a venturi vacuum source.

On Mon, Jan 11, 2021 at 12:34 PM Bud Rolofson <levilevi at comcast.net> wrote:

> Listerati,
>
> I’m trouble shooting a overheating problem at highway speeds (65-70mph)
> with my 69 Spitfire. Temp gage goes to red at higher speeds but then
> immediately cools off when idling.
>
> I suspect I have a bad or weaken vacuum advance on my Spitfire’s delco
> remy (friggin spell check made me type that over and over) distributor. I
> tested the vacuum line from the carb and it gets to 9 psi where the line
> connects to the vacuum advance when the engine is at 2500-3000 RPM.
>
> The problem is there is no movement to advance the timing that I can see
> by watching the vernier advance knob, it does not move at 2500-3000 rpm.
>
> Two questions:
>
> Should 9 psi be enough for the vacuum advance to work properly?  I
> couldn’t find specs for vacuum advances.
>
> If the vernier knob isn’t moving then is the vacuum advance not working or
> the centrifugal weights not moving? Or maybe both?
>
> Thanks
> Bud
>
> Extreme Parts Racing (more than just a haircut)
>
> 71TR6 CC57365 (Good 6)
> 71 Spitfire MK IV Race Car #3
> 69 Spitfire MK III (back up FE engine/dinghy car)
> 93 Minnie Winnie Race Support Vehicle
> 77 Z-50A Hardly Davidson Honda Mini-Trail Bike (Triumph Pit Bike)
>
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