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Holley 4 barrelbs on Chrylser 360bs

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wbasil

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I have Holley 4 barrels on my

I have Holley 4 barrels on my Chrysler 360's & I cannot seem to get the secondary to kick in. Should I be able to see the secondary's kick in when I am in neutral with the engine running at 4000rpm's. Even when the engine is off I manually open the secondary's & do not see any fuel pump in. I have checked & there is fuel in the secondary bowls.
 
"..."Should I be able to s

"..."Should I be able to see the secondaries kick in when I am in neutral with the engine running at 4000rpm's"

No. Vacuum--not existing in neutral when you rev it--is what pulls them open. If yours refuse to open UNDER LOAD, then you have the wrong springs in the vacuum diaphragm, or there's a vacuum leak going to it.

Unless your carb is a 'double pumper' with two accelerator pumps, you will not see fuel spray into the secondary barrels. You MUST see fuel in the primary barrels as you work the throttle or it would backfire like crazy.

Jeff"
 
"Jeff,
I finally got a chanc

"Jeff,
I finally got a chance to take the boat out for a ride & see if the secondary's kicked in. This is what I found out. The starboard engine reached 4400RPM's the secondary's opened a little bit with no fuel visable spraying in. When I manually opened the secondary's a little bit more i did see fuel. The port engine only reach 3100RPM's, secondary's opened up a little bit more then the starboard side & fuel was visible spraying in. This is mind baffling why this is happening. Any suggestions??"
 
"Warren:

to clarify jeff&#3

"Warren:

to clarify jeff's point, inside the carb is a dedicated port that creates a vacuum signal when enough air flows thru the carb. this is NOT intake manifold vacuum. that is connected to the vacuum diaphragms which actually move the secondaries. inside the can holding the diaphragm is a spring which is adjustable.

Jeff covered the most likely causes. If your starboard engine will spin up to RPM without the secondaries opening all the way, that's good for your economy provided it isn't lean. Only your port engine, you may want to verify the ignition system is working properly."
 
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