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Old 08-15-2002, 04:41 PM
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Post hesitation at cruise speed

I have a 55 265ci with a 4/b carter and i set timing to the book at 4 degrees btdc at 400rpm with vac. hooked up and about 10 or 12 degrees btdc at 1000rmp vac. unhooked. everything runs good at idle but when it reaches a steady speed it has a hesitation but i can give it a little gas and it goes fine until it levels out. i have found no vac. leaks i have used carb. spray at the base of carb. is this a known problem and i need help bad. (carb. is a 1956 that was restored in calf. by chuck)so the enter workings of the carb should be ok??????????????????? <img src="graemlins/sweat.gif" border="0" alt="[sweat]" />

[ September 24, 2002: Message edited by: 55belairht ]</p>

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Old 08-15-2002, 06:59 PM
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Have you tried adjusting your idle mixture?
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Old 08-15-2002, 07:04 PM
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Are you sure its a hesitation and not surging from to liitle fuel?
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Old 08-15-2002, 07:28 PM
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ha thanks 4 jaw chuck & johnsongass1 for the come back. i have adj. the idle mix. it will do this when i give it gas and looking in the carb. and the gas is going fine it is when the carb is running on the vac. from the motor that this happens is it maybe the vacumeter piston?
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Old 08-15-2002, 08:28 PM
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What is a vacumeter piston? I have never heard that term before.
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Old 08-15-2002, 09:44 PM
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Are your plugs and wires good,cap and rotor????Is the motor modded at all???Maybe it needs a differant heat range plug.
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Old 08-16-2002, 03:33 AM
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I don't know what a (vacumeter piston) is but it is in the book I have a 1955 4/b carb.manual that shows this I thougt it may control the gas at idle and at the cruise speed?
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Old 08-16-2002, 04:10 AM
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I think the "vacumeter piston" is 1955 speak for accelerator pump. I assume that it's an AFB Carter, and from memory the pump rod had to be "bent" to adjust pump stroke.

To me it sounds like this hestitation is classic "Holley" pump shot timing. The throttle only needs to open slightly with no extra fuel to cause that hesitation. Cheers........Barry
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Old 08-16-2002, 02:58 PM
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If there is a hesitition at road speed with constant throttle, it is likely in the power valve circuit, or a plugged fuel filter (or other interuption in fuel delivery).

[ August 16, 2002: Message edited by: KULTULZ ]</p>
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