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Old 01-27-2011, 07:03 AM
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edelbrock carb bogging problems

i have a 600 cfm edelbrock on my 302 ford and every time the secondaries open in boggs down but when i let off to half throttle it starts to hual *** again can someone help me figure this out please it is vary frustrating! thank you vary much
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Old 01-27-2011, 08:12 AM
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Two things are most likely to be causing this.

1. insufficient fuel pressure.
2. incorrect timing curve.

With this in mind, you need to check the fuel pressure
and we need to know how much initial timing and total amount of advance.
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Old 01-27-2011, 08:15 AM
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Two other possibilities:

3. Vacuum secondaries opening too soon.
4. Not a big enough pump shot.
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Old 01-27-2011, 09:06 AM
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Go to edelbrock's site and look at their tuning tip video. It will show you how to adjust the secondaries for proper opening to avoid the bog. I agree that the secondaries are opening too soon.
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Old 01-27-2011, 09:37 AM
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Tune idle lean to produce a white plug until all carb tuning finished.
Do a WOT pass.
Turn off engine coast to stop.
Pull a plug and verify it has some color.
If plug is bright white following WOT then need bigger secondary jets.

I was able to rid my carb of stumble using plug readings.
I am thinking of installing a wide-band air/fuel meter to double check tuning.
Perhaps I can maximize mileage also.
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Old 01-27-2011, 12:08 PM
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Click on this: http://www.fordmuscle.com/archives/2...etor/index.php
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Old 01-27-2011, 06:36 PM
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Here's a pretty good Edelbrock tuning article

http://www.fordmuscle.com/archives/2...etor/index.php

From my experience with AFB's and AVS's, I'd say a large part of the problem
is that the air valve on the secondaries is opening too quickly, you might also
need to speed up your accelerator pump by moving the rod one hole closer
to the pump stem. beyond that it would be using the graph in the linked article to select secondary jets and maybe fine tune your primary jets/metering rods/ rod plunger spring.
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Old 02-01-2011, 01:01 PM
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could it be the vacume advance diaphram?

thanks guys i will look into checkin that out. Also i have found out that my vacume advance diaphram dont hold vacume. Is it not supposed to or do you think the diaphram is bad? thanks again
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Old 02-01-2011, 01:37 PM
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Quote:
Originally Posted by XNTRCI-T
Two other possibilities:

3. Vacuum secondaries opening too soon.
4. Not a big enough pump shot.
5. Not enough rear end gear ratio.
6. Carb may be too large. Used a 500 cfm eddy carb instead.
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Old 02-01-2011, 01:48 PM
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Quote:
Originally Posted by 427feracer
thanks guys i will look into checkin that out. Also i have found out that my vacume advance diaphram dont hold vacume. Is it not supposed to or do you think the diaphram is bad? thanks again
The vacuum advance can SHOULD hold vacuum.
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Old 02-01-2011, 02:02 PM
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Vacuum advance does not come into play when you floor the peddle. In-fact it will retard because the manifold vacuum drop to "0".
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