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Original Message
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| RE: dual 4v |
| By John - 05/03/2004 9:15:43 PM; IP 142.177.75.62 |
| Pressure is nice about 7 to 8 psi. However you could have a fuel pump which is inadequate (possibly) or a fuel filter which is restrictive (most likely), or even too small fuel lines anywhere from tank to carb (so the experts say, but I havn't had any trouble with lines smaller than 1/2". About those 600's though. The ONLY difference is to the idle circuit as the idle adj is for fine tuning only. Two carbs give off twice the fuel they should at idle with the mixture screws in the normal position, but will run OK, but still rich in the fully closed position. The progressive linkage neeeds to be set up correctly and make sure the carbs are monted in the right position as the belcranks are different front vs back carb. If the fuel supply turns out to be OK, sounds like your driveability is in the accel pumps or possibly the vacumn advance. Are the vacumn advance connected together for synchronous secondary operation? If you use regualr carbs, you can drill and tap and add fittings to the vacumn chamber caps and add a balance tube. As far as the accel pumps go, check the colour of the cam and make sure both are the same and the nominal type (I forget that colour, but any Holley book will tell you that) and the 50cc pumps are a better bet than the smaller ones if you use an after market HP cam. Maybe the spring rates should be changed, but this hasn't had much affect in my experience. |
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