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Tuning Carbs: Holley, Mikuni, SU, Weber And Amal
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Published: November 3, 2006
It becomes necessary at some point in the life of every car to perform maintenance duties, such as, tuning carbs. The first step to tuning carbs is to figure out what kind of tuning carburetor your vehicle has: a Holley, Mikuni, SU, Weber or Amal.
Holley carb adjustment can be very tricky, but there are some easy guidelines to follow when tuning carbs.
The float bowls sometimes trap objects, so it generally needs to be checked and cleaned out when making Holley carb adjustments. Next, the accelerator pump lever needs to be set. Consult a specific make and model car manual to collect which setting is appropriate for your vehicle. Just a few more steps to follow. Afterwards, the throttle screws, primary and secondary, require adjusting, which leaves the throttle blades in a balanced position. The last step is balancing the rich lean mixture by tuning them. After all these steps have been taken, the Holley carb adjustment is complete and the carburetor is ready to be re-installed.
Mikuni carbs are known for their versatility and easy tuning due to the fact that, in general, only minor adjustments to the different parts of the carburetor need to be made. If your vehicle has a Mikuni carb, you might find yourself having to adjust the main jet size while tuning Mikuni carbs. Because the main jet size is closely associated with exhaust flow, the main jet size is dependent on which exhaust system you have. Check with your car manual for you vehicle's specific if unknown. The correct size for the main jet on a car with an exhaust system that comes with it is usually 160.
Tuning SU carbs is very similar to Holley carb adjustments. The carburetor basically needs to be taken apart, and all the pieces should be cleaned and re-oiled. Some of these parts include the float bowls, the throttles and the mixture. According to Roger Garnett in his article titled “Tuning Your SU Carbs,” there is a simple way to determine whether your mixture is rich or lean. With the air filter off, raise the carb piston by a sixteenth of an inch. While doing this, take notice of the RPM's. A rich mixture would cause the RPM's to rise, a lean mixture would make the RPM's fall and a perfect mixture would cause the RPM's to momentarily rise and then fall.
As with the other types of carburetors, tuning Weber carburetors is very similar. It is possible to play with the idle of your car while giving your carburetor a tune up. After adjusting the idle mixture screw on your Weber carburetor is the time to do it. This is done by playing with the idle speed screw, which is very sensitive. Only a fraction a turn should be enough to adjust the idling speed to where you like it. Make sure when changing the idle, to put a little weight on your car and turn on the AC. This is to mimic an actual riding experience, otherwise when you finally get into your car to drive off, the idle will be different than you intended. The idle should be set between 7 to 900 RPM because if it is set too high it will cause more wear and tear than normal on your braking system.
Tuning Amal carburetors is just like tuning any other carburetor; it needs to be taken apart and every piece should be cleaned and checked for build up. For a detailed description of step by step instructions visit Sterling Motor Works at http://sterlingmotorworks.com/amal_carburetor_tuni ng_tips. While tuning carbs, it is also recommended that you have a car manual at hand for your vehicles specifics, which change with make and model.
Tuning carbs can be a lengthy and difficult task, but once you've accomplished it once the next time will be a lot easier. A few tips go a long way, but it is necessary to read all literature that is accompanied by your new carburetor or a manual, for tune ups.
Carbs Unlimited. 2006. 01 November 2006. www.carburetion.com/Weber/adjust.htm.
Garnett, Roger. Tuning Your S.U. Carbs. 05 December 1991. 01 November 2006. www.niksula.hut.fi/~mdobrucks/siililand/mini/diy/3 /su-tune/su-tune.html.
Mikuni American Corporation. 2002. 01 November 2006. www.mikuni.com/tg_main_jet_size.html.
Sterling Motor Works. Amal Hints & Tips. AMAL Carburetters, Ltd. England. 2006. 01 November 2006. sterlingmotorworks.com/amal_carburetor_tuning_tips .
Understanding Your Holley. DjD. 2003. 01 November 2006. www.camaros.net/techref/articles/holley_2.htm.
Holley carb adjustment can be very tricky, but there are some easy guidelines to follow when tuning carbs.
Related Articles
Mikuni carbs are known for their versatility and easy tuning due to the fact that, in general, only minor adjustments to the different parts of the carburetor need to be made. If your vehicle has a Mikuni carb, you might find yourself having to adjust the main jet size while tuning Mikuni carbs. Because the main jet size is closely associated with exhaust flow, the main jet size is dependent on which exhaust system you have. Check with your car manual for you vehicle's specific if unknown. The correct size for the main jet on a car with an exhaust system that comes with it is usually 160.
Tuning SU carbs is very similar to Holley carb adjustments. The carburetor basically needs to be taken apart, and all the pieces should be cleaned and re-oiled. Some of these parts include the float bowls, the throttles and the mixture. According to Roger Garnett in his article titled “Tuning Your SU Carbs,” there is a simple way to determine whether your mixture is rich or lean. With the air filter off, raise the carb piston by a sixteenth of an inch. While doing this, take notice of the RPM's. A rich mixture would cause the RPM's to rise, a lean mixture would make the RPM's fall and a perfect mixture would cause the RPM's to momentarily rise and then fall.
As with the other types of carburetors, tuning Weber carburetors is very similar. It is possible to play with the idle of your car while giving your carburetor a tune up. After adjusting the idle mixture screw on your Weber carburetor is the time to do it. This is done by playing with the idle speed screw, which is very sensitive. Only a fraction a turn should be enough to adjust the idling speed to where you like it. Make sure when changing the idle, to put a little weight on your car and turn on the AC. This is to mimic an actual riding experience, otherwise when you finally get into your car to drive off, the idle will be different than you intended. The idle should be set between 7 to 900 RPM because if it is set too high it will cause more wear and tear than normal on your braking system.
Tuning Amal carburetors is just like tuning any other carburetor; it needs to be taken apart and every piece should be cleaned and checked for build up. For a detailed description of step by step instructions visit Sterling Motor Works at http://sterlingmotorworks.com/amal_carburetor_tuni ng_tips. While tuning carbs, it is also recommended that you have a car manual at hand for your vehicles specifics, which change with make and model.
Tuning carbs can be a lengthy and difficult task, but once you've accomplished it once the next time will be a lot easier. A few tips go a long way, but it is necessary to read all literature that is accompanied by your new carburetor or a manual, for tune ups.
Carbs Unlimited. 2006. 01 November 2006. www.carburetion.com/Weber/adjust.htm.
Garnett, Roger. Tuning Your S.U. Carbs. 05 December 1991. 01 November 2006. www.niksula.hut.fi/~mdobrucks/siililand/mini/diy/3 /su-tune/su-tune.html.
Mikuni American Corporation. 2002. 01 November 2006. www.mikuni.com/tg_main_jet_size.html.
Sterling Motor Works. Amal Hints & Tips. AMAL Carburetters, Ltd. England. 2006. 01 November 2006. sterlingmotorworks.com/amal_carburetor_tuning_tips .
Understanding Your Holley. DjD. 2003. 01 November 2006. www.camaros.net/techref/articles/holley_2.htm.
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