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TR6 TR 6 Carb question

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G

GilsTR

Jedi Warrior
Offline
The restoration of the 72 TR6 moves along quite well.
Question re the Stromberg carbs....
We have had the carbs rebuilt by Jeff @ PalTech...and
they look very nice. We have the stock jets in the carbs.
Have any of you used the adjustable jets...like the ones
from Richard @ Good Parts? Any input out there?
The car is to be our everyday road car.
Input greatly appreciated.
Gil. California
 
The 3rd carb I have on my '73 is older and has an adjustable jet. It's very easy to adjust and no fuss with dashpot oil after using the needle tool. But I'm not going to convert the other 2 because of that.
 
The stock jets in the Strombergs aren't as fixed as we are led to believe. They're pressed in from the factory and can be adjusted, though stubbornly at first.

If your engine is stock, the top of the jet(the recessed center section) should be 100 thousandths below the carb body. Care must be taken to not cause damage. To richen, the jet is tapped from above. To lean, the reservoir must be removed and accessed from below.

When I checked mine, all 3 jets were at a different height.

I was interested at first in the adjustable jets, but decided that once they are set properly, they're done.
 
I think DoughF is right on target. Further, if you don't have lots of performance enhancements (modified head, cam, high compression ratio, over bore, etc.) adjustable jets just add to the time hobbyist spend with tuning.
 
If I'm not mistaken, there's a shoulder in the fixed jet carb that stops the jet from being seated deeper than 0.1 inch.
I agree that the shoulder may not be machined to a uniform depth on each and every carb, but the ones I've measured are pretty close, at least close enough where an adjustable needle can compensate for the .01 or so difference.
By adjusting the float level and the needle height (if possible) a person should be able to get a good mixture.
The thing I do like about the adjustable jet, though, is that the engine can be running at any speed during adjustments and somtimes by paying close attention you can observe the engine's reaction while doing so.
 
My jets were first set to .120 without any modifying or troubles...except for being overly rich. The stubbornness in the beginning was due to old gas, heat, dirt, age, etc.
I put serious thought into the adjustable jets because of the fairly extensive work I did to the engine. They would have saved me a good amount of time, but the $300 for 3 sets was a big pill to swallow.
 
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