dklawson
Yoda
Offline
I've been posting to a related thread in the Spridget forum about carburetor conversions for the 1500 engine. The topic bears repeating here to get some additional thoughts on my situation.
To summarize briefly, I have installed a late model, single HS4 SU in place of the ZS carb on my project '72 Spit (1300). The carb has a 0.090" jet and the needle is an "ADD" which is close to what the Triumph Toledo used when its 1300 engine was outfitted with a single HS4. So... I thought the car would run better than it does.
I took the car on an "around the block" test drive today and it ran terribly. The idle is smooth and steady at 800 RPM and the car will move OK in 1st and 2nd gear. However, give it some gas and try to accelerate in 3rd and the car falls down and backfires out the carb (I think) which implies to me that it's going lean, way lean. The dizzy is a (new, less than 2k miles) late model Lucas 45D4 with new points and condenser and the timing is set for about 8 BTDC Static. ColorTune showed the mixture was rich at idle. Since the idle is rich and steady, I don't suspect a vacuum leak but I will look for one. I also plan to double check the float level.
Are there other areas you guys would look? Are there obvious things I'm missing? Did Triumph install a fuel filter somewhere that I don't know about that could be plugged? All feedback and suggestions are welcome.
To summarize briefly, I have installed a late model, single HS4 SU in place of the ZS carb on my project '72 Spit (1300). The carb has a 0.090" jet and the needle is an "ADD" which is close to what the Triumph Toledo used when its 1300 engine was outfitted with a single HS4. So... I thought the car would run better than it does.
I took the car on an "around the block" test drive today and it ran terribly. The idle is smooth and steady at 800 RPM and the car will move OK in 1st and 2nd gear. However, give it some gas and try to accelerate in 3rd and the car falls down and backfires out the carb (I think) which implies to me that it's going lean, way lean. The dizzy is a (new, less than 2k miles) late model Lucas 45D4 with new points and condenser and the timing is set for about 8 BTDC Static. ColorTune showed the mixture was rich at idle. Since the idle is rich and steady, I don't suspect a vacuum leak but I will look for one. I also plan to double check the float level.
Are there other areas you guys would look? Are there obvious things I'm missing? Did Triumph install a fuel filter somewhere that I don't know about that could be plugged? All feedback and suggestions are welcome.