Any chance that you have a collapsing lower radiator hose that only becomes
evident at high RPM? Many lower hoses are equipped with a spring inside to
prevent that from happening.
Alex Thomson
-----Original Message-----
From: Triumphs [mailto:triumphs-bounces@autox.team.net] On Behalf Of Bud
Rolofson
Sent: Monday, January 11, 2021 1:33 PM
To: Triumphs
Subject: [TR] Vacuum Advance of a delco remy
Listerati,
Iâ??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 Spitfireâ??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 couldnâ??t
find specs for vacuum advances.
If the vernier knob isnâ??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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