quick carb question
Thread Starter
Racer
Joined: Jan 2008
Posts: 338
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quick carb question
I have a Holley 750 with vacuum secondaries on a modified 427. I noticed today that no matter what I do to the gas pedal, the secondary butterflies will not open, even a little bit. I hooked up a vacuum gauge and my idle reading is 11inHg and under acceleration it goes to 15inHg. Is there possibly a hole in the diaphragm or maybe the spring inside the vacuum unit is too stiff? Any ideas would be great! Thanks
-ks
-ks
.
Safety Car
Joined: Oct 2004
Posts: 3,927
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From: Youngstown Ohio
I have a Holley 750 with vacuum secondaries on a modified 427. I noticed today that no matter what I do to the gas pedal, the secondary butterflies will not open, even a little bit. I hooked up a vacuum gauge and my idle reading is 11inHg and under acceleration it goes to 15inHg. Is there possibly a hole in the diaphragm or maybe the spring inside the vacuum unit is too stiff? Any ideas would be great! Thanks
-ks
-ks
Thread Starter
Racer
Joined: Jan 2008
Posts: 338
Likes: 0
Thanks for the advice guys. I also did the test where you clip a paper clip to the linkage below the diaphram and take it out for a test drive. When the secondaries open the paper clip is supposed to slide down and allow you to measure how much they open. When I preformed this test, the paper clip didn't budge. Perhaps I have a torn diaphragm. I guess a spring kit and extra diaphragms are in my future...
