[TR] Vacuum Advance of a delco remy

[Bud Rolofson]

I’m using dual 1 1/4” SU carbs. The front carb has a vacuum connection right at the butterfly that pulls no vacuum at idle but 9 psi at > 2000 rpm when the butterfly opens.


> On Jan 11, 2021, at 12:03 PM, John Innis <jdinnis at gmail.com> wrote:
> 
> 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 <mailto: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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Bud Rolofson

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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