• Hi Guest! Being a Paying Supporter is NOT a requirement to participate at BCF. However, subscribing will help ensure we can continue to serve the LBC community for years to come. If you enjoy BCF and find our forum a useful resource...Please consider supporting us by **Upgrading**
    (PS: Subscribers don't see this banner)

TR6 Vacuum Retard question


Freshman Member
Country flag
Evening all,

I am planning to have the distributor on my 1973 TR6 rebuilt this fall. I plan to have them replace the vacuum retard with vacuum advance. At the same time I am having my carbs rebuilt. They will drill the required port on the rear carb for the vacuum line to the distributor. I am curious if I can just disconnect the current vacuum line for the retard w/o having to do anything. I'm just curious what having no retard will do to fuel economy, performance, etc.
Thanks in advanced for any answers.

1973 White TR6


Country flag
Yes, you will need to tightly cap or seal the nipple on the bottom of a 73's rear carb if you disable the vacuum retard 'feature'
The 73 cars had a Thermostatic Vacuum Switch (or "Valve" if you prefer) in the top radiator hose. If no one has removed it, a vacuum line from the rear carb went there before reaching the distributor Vacuum Retard module.
If it's still there and if you are doing away with the RETARD, you can replace that whole deal, the 2 section of radiator hose and the TVS with a one piece radiator hose for the pre 72 cars.
There will be no change in performance by deleting the retard....And though I have done the same, added the Vacuum Advance module from BVU, I won't make any claims as to improving performance or gas mileage...any change was subtle, not exactly transformative and not to extent that it got a "WOW!" from me, but that's not totally unexpected considering when the vacuum advance is actually active,
ADVANCE 2 and 3 002.jpg
Similar threads
Thread starter Title Forum Replies Date
jfarris TR2/3/3A Early 56 TR3 H6 Carbs, distributor vacuum advance/retard Triumph 3
B TR6 Vacuum retard late TR6 Triumph 4
V Vacuum retard distributor?? MG 9
TR6oldtimer TR6 TR6 vacuum retard, counter intuitive to me Triumph 20
I TR6 vacuum retard help, 69TR6 Triumph 7
I TR6 69 TR6 distributor/vacuum advance/retard help Triumph 4
B Vacuum retard removal?? Triumph 4
D Vacuum retard Spridgets 12
philman disconnecting vacuum retard on computer Triumph 0
K TR2/3/3A Dist vacuum pipe to carb..... Triumph 5
JPSmit Today's question - vacuum advance Spridgets 2
Gliderman8 TR6 Vacuum Gauge Hookup Triumph 11
B Vacuum Advance Pipe Austin Healey 2
Twit TR4/4A TR4 AUC878 vacuum connections Triumph 7
R TR6 Thermostatic vacuum switch Triumph 3
T TR6 Carb Vacuum Port- TR6 Zenith-Stromberg Carbs Triumph 2
S TR6 TR6 Vacuum Issue... some help please... Triumph 8
M Vacuum Line on a 948 Spridgets 4
S TR2/3/3A Vacuum leak Triumph 19
B Vacuum Servo Austin Healey 19
D TR2/3/3A Vacuum connection at Carb Triumph 23
G TR4/4A Distributor Vacuum Manifold Hard Line Triumph 11
6TTR3A TR2/3/3A Vacuum advance questions Triumph 2
E TR4/4A Vacuum connection on SU-H6 carbs Triumph 4
D TR2/3/3A Vacuum advance tube Triumph 6
K TR4/4A Stromberg..."coupler" that links vacuum outlet to diff vacuum line is N/A? Triumph 3
C Distributer with no vacuum advance Spridgets 15
Griz Testing Vacuum Advance Austin Healey 5
BJ8Healeys '72 Midget Vacuum Advance Line Spridgets 2
J BJ8 Vacuum Advance - disconnected -RIGHT - when setting total advance?? Austin Healey 6
B TR6 Timing using a vacuum gauge Triumph 13
T MGB Vacuum advance and Electronic ignition conversion MG 5
SherpaPilot TR6 Vacuum Gauge Timing Triumph 5
jfarris TR2/3/3A Vacuum Advance Thread Size Triumph 9
PatGalvin TR2/3/3A Vacuum Hose Fitting Install, Any Suggestions? Triumph 6
Merlin63Tr4 TR4/4A Gasoline in vacuum advance unit. Triumph 10
jfarris TR2/3/3A SU H6 Vacuum Advance Fitting Thread Size Triumph 2
W BE vacuum advance line and fittings Spridgets 2
W Vacuum advance nipple Spridgets 0
Gerry M TR6 Vacuum Lines Triumph 8
GTP1960 TR2/3/3A SU, H6 carb vacuum line connector? Triumph 2
J TR2/3/3A Vacuum lin Triumph 13
PatGalvin TR2/3/3A vacuum leaks? How to check Triumph 9
M Vacuum Leaks Austin Healey 22
bigjones Vacuum advance on a 1500 Spridgets 13
sundown TR6 1973 TR6 vacuum reading Triumph 2
sundown TR6 1973 TR6 vacuum leaks Triumph 1
B TR6 Moss TR6 Vacuum Advance Conversion question Triumph 8
T TR2/3/3A Measuring manifold vacuum on TR3A Triumph 6
T TR2/3/3A Is it possible to drill vacuum advance port in SU H6 carb? Triumph 14

Similar threads