HELP!! Need pressure settings for Webers!!
09-17-01, 07:27 AM
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HELP!! Need pressure settings for Webers!!
I have two weber 36DCD's I am installign today, and I have a carter 7lb fuel pump and a Purolator dial type pressure regulator....what pressure setting do I set it at for these carbs??? It was shipped preassembled and at 2.5lbs, but that seems like to little, I wonder if the dial was moved during shipping. I need this info today by noon if I can get it, please!!! Again, I need the pressure regulator setting for dual 36DCD webers on a rotary engineering manifold! Thanks!
09-17-01, 11:47 AM
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Try it and see. It won't hurt anything. If it's to low you will run out of fuel and the car will die or stumble. Then turn it up a little untill you get it right.
I would think that the webbers would need more pressure than that.
Mike
I would think that the webbers would need more pressure than that.
Mike
09-17-01, 01:37 PM
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I dont know what the fuel pressure requirements are for your set-up, but I'd excercise caution when experimenting with different pressures. Fuel pressure has a direct affect on float level... and float level has a direct affect on air/fuel mixture at speed (the lower the fuel level in the bowl, the more the emulsion tube is exposed and the leaner the engine will run).
So, setting the pressure too low will cause your engine to run lean at higher rpm... a potentialy dangerous situation. Other symptoms include stumbling in sharp corners and in sudden stops. Setting the pressure too high will result in rough idling, backfiring and overall poor carburetor functioning.
So, setting the pressure too low will cause your engine to run lean at higher rpm... a potentialy dangerous situation. Other symptoms include stumbling in sharp corners and in sudden stops. Setting the pressure too high will result in rough idling, backfiring and overall poor carburetor functioning.
09-17-01, 01:47 PM
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You need about 2-4psi for a webber carb. The carbs don't need much pressure, but they do need volume (carter pump is good)
I would not trust the numbers on the Puralotor regulator - they are known to be way off. Get a good fuel pressure gauge and plumb it in to the line to give an accurate reading.
I would not trust the numbers on the Puralotor regulator - they are known to be way off. Get a good fuel pressure gauge and plumb it in to the line to give an accurate reading.
09-17-01, 11:14 PM
#6
I'm running that same setup, youll need about 4.5 psi to start and do some tuning from there. Don't even drive your car with that purolator regulator on it; it wont be able to flow enough fuel to sustain the engine over about 6k and you'll run a serious risk of damage. Get yourself a holley regulator from Summit (HLY-12-803).
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