Stromberg 175 CD-2 Metering Needles
#2
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Bill,
When you say all, did you remove and plug the " temperature compensator" on the side of the carburetors? This will let more air in to lean mixture when engine is fully warm.
https://mossmotors.com/jxj-7983-stromberg-carburetor See # 37 and # 23
You probably have the original needle P/N. The later P/Ns were to tighten down emissions and would be worse than you original P/N needle for performance.
Two options: convert to adjustable needle (same profile) or convert to adjustable jet. Ask Joe for his advice. I sent him 3 Zenith Stromberg 175 CD-2 carburetors, and he converted them to adjustable needle. He has parts for both and you can do the work yourself. CALL TO ORDER PARTS 718-762-7878 JoeCurto@Aol.com
Rgds
David
When you say all, did you remove and plug the " temperature compensator" on the side of the carburetors? This will let more air in to lean mixture when engine is fully warm.
https://mossmotors.com/jxj-7983-stromberg-carburetor See # 37 and # 23
You probably have the original needle P/N. The later P/Ns were to tighten down emissions and would be worse than you original P/N needle for performance.
Two options: convert to adjustable needle (same profile) or convert to adjustable jet. Ask Joe for his advice. I sent him 3 Zenith Stromberg 175 CD-2 carburetors, and he converted them to adjustable needle. He has parts for both and you can do the work yourself. CALL TO ORDER PARTS 718-762-7878 JoeCurto@Aol.com
Rgds
David
Last edited by David84XJ6; 08-05-2023 at 03:33 PM.
#3
#4
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The problem is they (Stromberg 175 CD-2 carburetors) were smog carbs with no mixture adjustment, i.e. no tuning. They came new with lead seal and all you could do is install seal kit at your dealer, who could put a new lead seal on. If you had a worn needle and replaced it, you would go even leaner. By removing the emissions secondary throttles and Cross Over tube to exhaust and back for idle mixture heating, you had less anatomization of the fuel and a poor idle. The fix is to richen the idle mixture, which is option not provided for on a smog carb. The same carb was available in UK with the adjustable needle, so parts eventually made it to the US, as most states stopped monitoring the older cars.
The fixed needles ridge were to be installed flush with the bottom of the piston, but you could grind the tip of the needle off, and push needle into the piston 3/32" from flush. Then secure needle with set screw. I know this from experience.
The fixed needles ridge were to be installed flush with the bottom of the piston, but you could grind the tip of the needle off, and push needle into the piston 3/32" from flush. Then secure needle with set screw. I know this from experience.
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David84XJ6 (08-07-2023)
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