Problem at the track - Team Camaro Tech
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post #1 of 8 (permalink) Old Oct 11th, 10, 08:24 PM Thread Starter
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Patric
 
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Location: Montreal
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Problem at the track

Hi, i went for the second time this year to test the car at the track. I am having a problem at the starting line when i floor the gas pedal the car stall

Specs
355 c.i
274h hydraulic comp cam
edelbrock 600 cfm with torquer 2 intake
th 350 automatic transmission
jegs 2700 rpm stall
Hei ignition

The problem was there the first time i went. So i rejet the carburator, i have add the torque converter. At the track i have change the rods, and springs. The basic timing is at 22 degrees ( no vaccum advance on the car) and total is 36. I have tried 38, 40 and 42 without improvement. I have drill the accelerator pump disjarge nozzle to 0.040 insted of .030. change the rod location, the problem is still there.

Any idee on what to check (on a budget)

I call edelbrock hotline, i tried changing the rods, springs and discharge nozzle .
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post #2 of 8 (permalink) Old Oct 12th, 10, 03:17 AM
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Re: Problem at the track

A few things to try one at a time:
I read the engine is under load, then the pedal is snapped to WOT and engine bogs right out.
I would take out some initial timing and install heavy weight springs to slow the progression of mechanical advance.
I would adjust the pedal to NOT open the secondaries and try. If the bog clears, then the air valve, the butterfly on top of the secondaries, opens too soon. Need to slow it's opening.
I would add a length of coarse sponge or ball up a small section of door screen and shove it into each bowl vent, the trapizoid opening on the side of the air horn between the venturis. Fuel could be dumping from the bowl(s) into the secondary side upon vehicle movement and flooding the engine.

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post #3 of 8 (permalink) Old Oct 12th, 10, 10:03 AM Thread Starter
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Patric
 
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Re: Problem at the track

Quote:
Originally Posted by Everett#2390 View Post
A few things to try one at a time:
I read the engine is under load, then the pedal is snapped to WOT and engine bogs right out.
I would take out some initial timing and install heavy weight springs to slow the progression of mechanical advance.
I would adjust the pedal to NOT open the secondaries and try. If the bog clears, then the air valve, the butterfly on top of the secondaries, opens too soon. Need to slow it's opening.
I would add a length of coarse sponge or ball up a small section of door screen and shove it into each bowl vent, the trapizoid opening on the side of the air horn between the venturis. Fuel could be dumping from the bowl(s) into the secondary side upon vehicle movement and flooding the engine.
Hi the problem was there with 10 to 14 degrees of advance and vaccum advance connected or not.
Also the secondaries are vaccum activated so no way to adjust opening
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post #4 of 8 (permalink) Old Oct 12th, 10, 11:24 AM
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Re: Problem at the track

I don't think the secondaries on an Eddy carb are vacuum actuated like a Holley carb.

The secondary plates are manually opened, but the air valve is the device to open the secondary memtering system. Throttle plates open, air starts to flow pulling open the air valve lifting the needles from their jets allowing fuel to mix with the airstream. If the air valve counterweight is too light, the rods are raised too quickly.

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post #5 of 8 (permalink) Old Oct 12th, 10, 04:14 PM Thread Starter
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Patric
 
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Re: Problem at the track

Hi, you are right
The air streem generated by the vacuum will moove a weight that will calculatethe gas needed. They are no way to adjust the secondary rate of opening unless i grind the weight. ( no real similarity with holley)

Also i have noticed that there is full vaccum on the ported side even if i lower the rmp to less than 500.
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post #6 of 8 (permalink) Old Oct 12th, 10, 05:50 PM
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Re: Problem at the track

You can add weight to the top half of the air valve, equally of both plates. Use a screw and a locknut and lead weight. Trial & error.

If the port above the throttle plates has vacuum, then throttle plates are open too far and may be needed for the camshaft installed, unless you open the secondaries slightly so you can close the primaries further. only you know what your engine requires.

I find an HEI equipped engine runs better with full vacuum going to the HEI vac cannister, therefore, you should be able to close the primaries further for better engine response all around.

I have a 307 set up the same way, idles at 600 rpm, snap to WOT and it's turning 5K, air valve is just starting to open. With no load, air valve will never open - too high of rpm, but, it does start to open. Air valve opening is engine demanded - the airflow requested by the engine will open it.

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post #7 of 8 (permalink) Old Oct 14th, 10, 08:11 PM Thread Starter
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Patric
 
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Re: Problem at the track

Hi, i tried 2 things tonight, i set the basic timing to 30 deg without connecting vac. advance and i tried to close the throttle plate much i could (425-475 rpm) and i still have vacuum on the port side

Also i let the car run on idle and i closed both mixture screw and the motor still run (crapy way but still run)


i will try to disconnect the secondary like you said in the previous post

thank you
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post #8 of 8 (permalink) Old Oct 15th, 10, 02:59 AM
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Re: Problem at the track

If the port is connected to the base plate, bottom of the carb having the throttle plates, then it's full time vacuum - manifold vacuum and always there.

The port on the carb body is, or should be ported. Vacuum after throttle plates open.

With a low rpm and some action from the mixture screws is a good thing. I might lessen the amount of initial advance, vacuum gauge will tell you, as in engine will tell you.

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