holley 650dp for my 355 - Page 3 - Hot Rod Forum : Hotrodders Bulletin Board
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  #31 (permalink)  
Old 03-26-2013, 11:24 AM
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Google "Tunnel Ram 406"
 
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Look in the Holley Book. It shows the same picture.

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  #32 (permalink)  
Old 03-26-2013, 11:35 AM
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Okay we can do book quotes.

If you are in disagreement with what I typed please indicate the passage.
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  #33 (permalink)  
Old 03-26-2013, 11:43 AM
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Quote:
Originally Posted by lg1969 View Post
Wrong my friend
Are you,LG, going to identify what was incorrect?
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  #34 (permalink)  
Old 03-26-2013, 11:51 AM
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What do mean? I read the book about Holley Carbs.
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  #35 (permalink)  
Old 03-26-2013, 11:53 AM
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Awesome. I like books too, and girls, and cars, and music. See we have things in common I bet.

The diagram is from holley, I do not have a problem with it.
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  #36 (permalink)  
Old 03-26-2013, 03:01 PM
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Here is some more info on page 6
Attached Files
File Type: pdf Carburetor Tech Info.pdf (131.8 KB, 26 views)
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  #37 (permalink)  
Old 03-26-2013, 03:12 PM
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Do you have a question?

Have you seen the secondary function at load. The secondary opens similar to an actuator. A mechanical secondary linkage is fashioned progressive or not, wide open is wide open with 4 barrels.

On my old 440 even at wot it did not open all the way. It took some distance to pull the secondary open to its maximum. Even then it was not able to open all the way. Due to a stumble I had to spring it so it never opened all the way to get max cfm. I went double pumper. Both carb types tune and worked well. The dp was more correct for the application. There were many changes made with the carb swap, but I believe that it did improve the performance at the track.

Last edited by spinn; 03-26-2013 at 03:36 PM.
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  #38 (permalink)  
Old 03-26-2013, 03:31 PM
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Remove the check ball in the housing. It will make a big difference. Use the paper clip method to see if the secondary is opening.
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  #39 (permalink)  
Old 03-26-2013, 03:47 PM
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I built my racing 440 about 20 years ago.

I haven't had time to go to a track in 10+ years.

There is no track for me in 250 miles in any direction.

It would have to be a family thing, and my girlfriend is a big city person who hates cars.

You would remove the checkball on only low vacuum engines or all?
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  #40 (permalink)  
Old 03-26-2013, 03:51 PM
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The reason your secondary did not open all the way is that is all the motor wants. Secondary will only open what the motor needs. If you use a 780 CFM carb and the motor can only pull 700 CFM, the secondary will only open so much.
BTW: I do not have check ball in dual quad vacuum secondary Holley tunnel ram setup and does not bog at all. The tires spin so fast it practically put a hole on the black top, and it has 15" of vacuum at idle.

Last edited by lg1969; 03-26-2013 at 04:05 PM.
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  #41 (permalink)  
Old 03-26-2013, 04:09 PM
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A hole in the blacktop...really?

My grand coupe clocked a 13.0 flat back in about 92.

440, .509 cam, single plane,727 hi stall, 4.10 gear, hoosier DOT. It was a lot of fun. I followed the reciepe on the box. The jobber connection parts had formulas on the back for bracket racing. So I built the 13 second car, and it ran 13 seconds . Go figure.
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  #42 (permalink)  
Old 03-27-2013, 09:05 AM
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On your 440 the vacuum secodnaries would have opened all the way at WOT if it had been set up right.
The way the come stock is very conservative (slow secondary action) becasue most cars accelerate slow.
You can change that but it takes specific re-work. It is actually more work than getting a DP carb right.

vac secondaries do not work on manifold vacuum at all.
They work on the vacuum created by air flow thru the venturii. There is a signal port on the pri and on the sec
venturii for this.

manifold vacuum has nothing to do with it. There is more to it than just swapping the spring in the vacuum diaphram housing. You rarely need to remove the check ball. But the bleed under it can be adjusted for bleed flow. It is setup very conservative.
The bleed can be made adjustable by adding a orifice needle screw. (like a idle mixture screw) on the vac sec housing.
You can modify the stock vac sec housing or buy a special adjustable type.
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  #43 (permalink)  
Old 03-27-2013, 01:43 PM
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Do I change to springs to limit mech advance or weights
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  #44 (permalink)  
Old 03-27-2013, 02:02 PM
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How much manifold vacuum are you running at idle? The cam looks pretty big. What is the cam specs if you know?
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  #45 (permalink)  
Old 03-27-2013, 02:08 PM
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To b honest I have no Idea do I plug a vacuum gauge to the carb??? All I kno it's a enough to keep vacuum brakes and power steering
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