Previous owners and mechanics have been known to mangle it and disable it.Ī lean mixture can also be caused by an open idle trim screw. The temperature compensator commonly goes out of adjustment on its own, defaulting to the open position and causing a lean condition. Once the underhood temperatures return to normal, the temperature compensator returns to the closed position. When properly adjusted, this device opens and changes the “depression” in the throat of the carb under high-temperature conditions, dropping the piston and thus leaning out the mixture. It features a bimetallic strip that has a plunger at one end. It can be found under a long plastic cover, just in front of the bypass assembly. If the engine is running too lean, check out the temperature compensator. If this causes the rpm to drop to a controllable level, then the throttle bypass assembly needs to be rebuilt. The throttle bypass assembly is an emissions control piece designed to keep the engine speeds high during shifting.įor test purposes, you can turn the adjusting screw counterclockwise–to do so, pop off the brass plug on the end of the unit. The usual suspect is a unit called the throttle bypass assembly, which is located on the righthand side of the carb when the unit is viewed with the air intake toward the rear. Sometimes these cars get a high idle–1200-2000 rpm–which cannot be controlled by the idle screw. However, they’re usually nonadjustable, so you have to change the tops if using them on adjustable pistons. The TR250 needle is richer than the B1AF, so fitting them will again help on the lean surge issue. The number is stamped on the top shank of the needle to find it, pull it down against the spring. The TR250 uses a B2Y metering needle, and the TR6 uses a B1AF metering needle. The old carburetor oil recommendation was ATF–auto trans oil. You’ll also have to either source adjustable versions of the metering needle or swap the adjuster tops of the old needles over to the original needles. The later carburetor pistons from an XJ6 Jag, V12 Jag, Lotus, Jensen, etc., will fit and are a common and relatively easy-to-obtain improvement.
To identify a carb with an adjustable piston, look for two notches found across from each other on the steel tube that serves as the damper oil reservoir. The later, 1972-’76 carburetors have an adjustable metering needle. There’s also an adjustable jet conversion available that fits all the CDSE-type carburetors for both 0.100 and 0.090 jets.
#TR6 REDLINE TIRES PROFESSIONAL#
You want to use professional tools to move the jets since you don’t want to distort the shape of the orifice. I find that setting the jet to the later dimension of 0.125 inch below the bridge helps to remove a lean surge at speed. Unfortunately, with modern gas this setting does not provide enough fuel. The early cars from around 1967-’71 had the jet set below the bridge by about 0.085-0.095 inch. The carburetor pistons aren’t adjustable, so the only way to change the fuel mixture is to lower the jet. These carbs were much maligned and disliked, but in truth they were pretty trouble-free. emissions came into play in 1968, however, Zenith went to the dark side and came up with the CDSE type. Triumphs have long used Zenith Stromberg carburetors the TR4A first had them in 1965. Finish off the job with some good tires, and your TR6 will handle like a sports car should.
#TR6 REDLINE TIRES UPGRADE#
If you want to go a little further, upgrade the front anti-roll bar and add a rear one with maybe some firmer springs. Solid aluminum steering rack mounts can provide better steering response by keeping the rack from sliding in its mounts. A thorough rebuild and replacement of all suspension bushings, ball joints, tie-rod ends and trunnions, along with proper alignment, can do wonders for these cars.Īdditional upgrades, like uprated bushing kits made using harder material, can offer a big improvement in handling with little sacrifice in ride quality. Extra horsepower is of no use if your TR6 doesn’t handle well under aggressive driving.
0 kommentar(er)
