Stick
Freshman Member
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I bought a bugeye racecar last fall, and have been trying to get it tuned up and running right. The car seems to always run rich, and in the process of trying to tune it up I noticed that the carbs are spitting fuel. I think this might be part of my problem, but I don't know what is causing it? This is my first time working on SU carbs (or any carbs in any detail) so I am lacking lots of experience with them.
Some things to know, this is a 1959 948 racecar with modified carbs and modified N/A engine built to run and running on 110 leaded fuel. I don't know the full extent of the modifications but at the very least it is running an aggressive cam, and possibly a lot more done to it. Where normal carbs have a flat spot at the bottom by the jet, mine are rounded out. Also, fuel PSI is usually around 6-7 PSI. This is about twice as much as normal I am told. However, when I remove the top of the float bowels I am able to stop the flow by lifting the float with my finger so I don't <span style="font-style: italic">think</span> it is a simple case of flooding the carbs from the PSI. Also, when I turn the fuel pump off the carb still spits right up until it runs out of fuel.
Does anyone know what could be causing this or things I should be checking? Also, I can take and post pictures of anything that would help you help me figure out what is going on here.
Edit: Also, compression is good (180-200 cold on all cyls)
Thanks
Some things to know, this is a 1959 948 racecar with modified carbs and modified N/A engine built to run and running on 110 leaded fuel. I don't know the full extent of the modifications but at the very least it is running an aggressive cam, and possibly a lot more done to it. Where normal carbs have a flat spot at the bottom by the jet, mine are rounded out. Also, fuel PSI is usually around 6-7 PSI. This is about twice as much as normal I am told. However, when I remove the top of the float bowels I am able to stop the flow by lifting the float with my finger so I don't <span style="font-style: italic">think</span> it is a simple case of flooding the carbs from the PSI. Also, when I turn the fuel pump off the carb still spits right up until it runs out of fuel.
Does anyone know what could be causing this or things I should be checking? Also, I can take and post pictures of anything that would help you help me figure out what is going on here.
Edit: Also, compression is good (180-200 cold on all cyls)
Thanks