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Triumph TR6 - SU Carbs-Vacuum test

Okay, it's my 71. I rechecked vacuum with the gauge. At idle, there is no vacuum coming off my rear SU carb. However, there is vacuum when you rev the engine; maybe 15 to 20 inches at 3,000 RPM. And, it holds steady. According to the info with the gauge, this is what it should do and I probably need to put a clamp on the hose into the distributor as it is fairly loose. I noticed that my garage does fill up with really nasty exhaust fumes when I do this (doors open, cross ventilation going for safety). The exhaust smoke is whitish, which indicates valve issues.

Is there anyone around the Jupiter, Florida area that could take a look at this car and tell me what they think? It runs okay, but seems to me to be running rich and using a bit too much oil and gas, but I just don't know enough to know what it should be doing.
JL Bryan

Hi John

White smoke does not indicate valve issues!!!!! White smoke is in effect steam. Bad valves will give you a blackish to blue from unburnt gases and oil exhaust.

I don't know how much you drive the car to really burn off moisture in exhaust.? From the post of 99% humidity and rain take a look at your exhaust pipe angles. Between that and vent feeding the carbs high humidity and the muffler acting like a rain barrel on short trips. I don't bloody wonder you have white smoke. :)

That particular Vac port and line going to the carb is technically called off idle. Vac only happens on acceleration. The port and capsule on your TR distributer unless changed is a retard capsule. Don't connect off idle to that port!!!! As the vacuum increases it will try to retard the timing against the centrifical advances. Get some vacuum caps from any parts store and cap them both.

I'm outa here till the 1st so good luck.
Bill Brayford

JL - Call Glen Effinger in Stuart, Florida Tel:- (772) 283-7700.

He is one of the best when it comes to any kind of TR repairs. He sets up TR's for the racing guys too.

Don Elliott, Original Owner, 1958 TR3A
Don Elliott

Is there an echo in here?

"cap them both".

Now THATS a novel idea John. <G>

Jim Deatsch

This thread was discussed on 25/09/2003

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