• Hi Guest!
    You can help ensure that British Car Forum (BCF) continues to provide a great place to engage in the British car hobby! If you find BCF a beneficial community, please consider supporting our efforts with a subscription.
    There are some perks with a member upgrade!
    **Upgrade Now**
    (PS: Subscribers don't see this gawd-aweful banner
Tips
Tips

vacuum line routing

Share this page

C

captainde

Member
Offline
I am a new member with a 57 tr-3 it has a tr-4 motor and drivetrain, can anyone help me with routing the vaccumm advance line from the carbureter to the distributor?

Thanks,
captiande
 
There is a port on the bottom back side of the forward carb where the vacuum line attaches. The line runs under the radiator hose through a clamp that is attached to the thermostat housing then on to the distributor. The clamp at the thermo housing also holds the fuel line. Does this help or will you need photos?
 
Hello Jedi,

Thanks for your help, I guess I couldnt see the port on the forward carb and did not know wether it was on the manifold or the bottom of the carb. I think I can find it without the pic.
Thanks Again,
dennist
 
Hi,
I have a tr-4 engine and su carbs, I looked for the vacuum port under the carb right by the manifold, the front carb has one hole in the area where the vacuum port should be and the rear carb has two holes on the bottom, the holes appear not to contain any junction for vacuum hose. Are these holes all active? I have trouble getting the engine idle at 550-660 rpm do you think these ports might be causing a vacuum leak and making the engine idle fast (1000rpm)?
Thanks,
dennist
 
Normally no, the extra holes aren't actually drilled to anything. The one hole that is drilled, will have threads in it for an adapter.

The vacuum advance normally doesn't get vacuum at idle, so most likely you won't have an idle problem even with the port open. But you could always stuff a wad of chewing gum or similar over the holes, to see if that makes a difference.

Also worth checking is the accuracy of your tach. Not at all unusual for originals to read high.
 
Had to go look to be sure; my front carbs have two holes as well (but only one is drilled and tapped for the advance port). Here's a shot of an older carb that happened to be laying near the bench.
 
Check to make sure that both butterflies are adjusted properly and closing at idle. If not, it can cause a fast idle.
 
Thank you for that excellent picture, it really helped clear up my question without removing the carb from the car.
Thanks,
captainde
 
Welcome to the Forum, Capt.

I would think that your car should move along quite nicely with that TR4 drive train. Can you post any pictures to show us what you have?
 
Thanks for the response, I have some the day I bought it but it's on a car dolly. I will post a couple in a week or so, been too busy doing the hydraulics, it sat for 12 years.
Thanks

captainde
 
Back
Top