[TR] Vacuum Advance of a delco remy

[Paul Tegler]

ditto on the vac description sounding bass-ackwards.
you want little to no vac adv when accelerating (low manifold vacuum) 
and lot on very high manifold vac (cruising/idling)
Vac Adv the vac port is pointing away from the dist body. Vac retard the 
port is on the dist side of the vac assy.

On the heat... VERY common for Spit engines to end up with an air bubble 
trapped in the head.  Sounds odd... but park your car on a very (VERY) 
steep hill or up on high ramps.
check the rad fluid level. Put the cap back on and let it warm up. 
(thermostat opens) Let it cool enough to recheck your rad fluid level.
...betting you'll see the level is lower as the air in the head moves to 
the higher rad upper tank.

It's not so much that the head is above the rad as it is the passage 
ways for the air to escape are below where air can get trapped.

btdt.

ptegler

On 1/11/2021 8:01 PM, John Innis wrote:
> That does not sound right to me, normally you expect vacuum to be 
> HIGHEST at idle and fall off as RPM's increase.  Do you know which 
> model of the Delco distributor you have?  IIRC there was one that had 
> a vacuum retard, instead of advance.
> WRT your overheating, check your fan clutch.  That sounds like it is 
> not getting enough air.
>
>
> On Mon, Jan 11, 2021 at 2:03 PM Bud Rolofson <levilevi at comcast.net 
> <mailto:levilevi at comcast.net>> wrote:
>
>     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
>>     <mailto: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)
>>
>>         ** triumphs at autox.team.net <mailto:triumphs at autox.team.net> **
>>
>>         Donate: http://www.team.net/donate.html
>>         <http://www.team.net/donate.html>
>>         Archive: http://www.team.net/pipermail/triumphs
>>         <http://www.team.net/pipermail/triumphs>
>>         http://www.team.net/archive <http://www.team.net/archive>
>>
>>         Unsubscribe/Manage:
>>         http://autox.team.net/mailman/options/triumphs/jdinnis@gmail.com
>>         <http://autox.team.net/mailman/options/triumphs/jdinnis@gmail.com>
>>
>>
>>
>>     -- 
>>     =================================
>>     = Never offend people with style when you   =
>>     = can offend with substance --- Sam Brown  =
>>     =================================
>
>     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)
>
>
>
> -- 
> =================================
> = Never offend people with style when you   =
> = can offend with substance --- Sam Brown  =
> =================================
>
> ** triumphs at autox.team.net **
>
> Donate: http://www.team.net/donate.html
> Archive: http://www.team.net/pipermail/triumphs  http://www.team.net/archive
>
> Unsubscribe/Manage: http://autox.team.net/mailman/options/triumphs/ptegler@verizon.net

-- 
Paul Tegler
ptegler at verizon.net  www.teglerizer.com

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://autox.team.net/pipermail/triumphs/attachments/20210111/57fb7cab/attachment.htm>