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    SB Air Gap mods

    You need to give some thought to the desired outcome......before cutting. Generally when you cut down the divider on a dual plane manifold, it adds a little top end but softens the low end. If the engine is in a heavy car with tall gearing, it might hurt overall performance. And vice versa.
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    Need help with edelbrock 1406 carb

    I have found that you can generally re-use the gaskets on these carbs if you are careful with disassembly & do not rip them.
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    Need help with edelbrock 1406 carb

    Uhhhhh. Yes & no if you are referring to the AFB/AVS models. Edel copied the the Carter & many parts are interchangeable. You could swap the top of the #1406 Edel carb mentioned in this thread with a Carter #96XX carb, & both will work as they did before. There were changes in the boosters, but...
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    Need help with edelbrock 1406 carb

    Carter fuel pressure/float setting. Note 10 psi.
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    Need help with edelbrock 1406 carb

    Dmopower, Post #26. The more you post on this, the more you show lack of knowledge: - fuel level can rise [ seep ] for other reasons than trash. Improperly machined fuel inlet seat, deformed needle, needle a sloppy fit, excess pressure & leaking gasket can all cause the problem. -...
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    Need help with edelbrock 1406 carb

    Dragtop, You probably didn't get lucky by not having a reg. The FACT is these carbs will handle 10 psi. I will see if I can up load the Carter chart that says so. I have run 9 psi at the drag strip, zero issues, as a quick test to slightly richen the mixture. [1] Carter recommends on all...
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    Need help with edelbrock 1406 carb

    DM, You can postulate all you like. Everything in post# 11 is true & correct. Page 9 of the Edel tuning guide states a fuel starvation issue could be caused by low fuel pressure & 4-5 psi is reqd, MINIMUM. NOT MAXIMUM. Further, Edel carbs come with the small 0.093" n/seats. The comp...
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    Need help with edelbrock 1406 carb

    The Edel carbs are NOT sensitive to fuel pressure. The fuel system is a DIRECT copy of the original Carter AFB design, which was designed to use up to 10 psi of fuel pressure. Carter even produced a chart for tuners to set float level/fuel pressure because one affects the other. The reason Edel...
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    storing a carb currently in use

    The problem is the acc pump plunger cup. It will dry out & shrink; when the carb is re-fitted, no pump shot. Best to loosen the air horn screws & dribble ATF into the pump chamber to lube the plunger cup.
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    Fill neck grommet issue

    Vaseline or ATF for lube, both compatible with rubber.
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    For those who have used/using a comp series Thermoquad

    Love hearing TQ stories, but would like info on my specific question if anybody has some.
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    For those who have used/using a comp series Thermoquad

    I have 850 CS TQs, one with screw in jets, one with push in jets. Both have a brass tube in the rear of the carb for the air valve diaphragm hose. This brass tube has a very small hole in it, about 0.015". It severely restricts the release rate of the diaphragm & therefore how quickly the AV...
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    Thermoquad pre test

    Mopar 38. Not sure if you are asking....or...telling....
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    Thermoquad pre test

    And?
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    Annular boosters on a Tunnel Ram

    71 GSS, Your post #107. Sorry for the delay [ time difference ]. The quotes you need are in posts# 19, 27 & 53. I thought I had included the info from Holley engineer, Mike Urich. Couldn't find it, might have been thinking of another thread. P. 23 of the Holley book: 'The strong...
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    Annular boosters on a Tunnel Ram

    71GSS, Post #104. I have provided two quotes earlier in this thread [ referred to in post #105 ] that that show a smaller MAB starts the system the earlier. A larger MAB will lean the mixture at WOT, not richen it.
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    Annular boosters on a Tunnel Ram

    RB/TT5, I have posted TWO quotes, one from Holley engineer Mike Urich & one from Dave Emanuel's Carter book that state that a smaller MAB starts the system sooner. That part of it is simple high school physics, as shown with the straw example. Despite all the blustering & hoo-ha from RB...
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    Annular boosters on a Tunnel Ram

    Well you didn't say that in post #87... You just said the MAB starts the main system sooner. No mention of the MAB being bigger or smaller. That was what I was querying.... Oh, & I am following....& I have had real world experiences as well.
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    Annular boosters on a Tunnel Ram

    T55.9, Post #87. The MAB starts the main system sooner. Compared to no MAB? Not following.
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    Annular boosters on a Tunnel Ram

    92b, Post #86. You get it, go to the top of the class & get your gold star..... A lot of people on this thread are talking about fuel flow after the main system starts. It has to have a starting point. The straw/liquid example describes the system start up perfectly.
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    Annular boosters on a Tunnel Ram

    71GSS, Unfortunately in your post #68, logic is missing from the first three lines. If a larger MAB starts the mains sooner [ it doesn't ] & flows more fuel, then it follows using the same logic that increasing the MAB will increase the fuel flow even further; not stop it as you say...
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    Annular boosters on a Tunnel Ram

    RB, What I know is what it says in post #58 & it is correct. Same as what I have said. Tom Vaught [ not Vought ] is a university trained engineer who worked for Holley during the glory years, & then spent decades at Ford before retiring. We correspond via email. He told me Mike Urich, Holley...
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    Annular boosters on a Tunnel Ram

    RB, Nope, still getting it wrong & Shrinker doesn't agree with this fact: a larger MAB starts the system later, not earlier. If you bothered to read post #58 fully, you would have seen the straw/liquid experiment mentioned, which I posted waaaaay back in this thread. From post #58: ' A larger...
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    Annular boosters on a Tunnel Ram

    RB, You know what Tuner says? So do I, I have read it. And it is NOT what you say he says. Why don't you tell us all about pressure differentials at low air flows???????????????? I am sure DV would like to know as would many others.....
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    Annular boosters on a Tunnel Ram

    Nope, not wrong & neither do Shrinker/Tuner say I am wrong. Quote where S & T say: a larger MAB starts the system sooner. From D. Vizard: [1] His Holley book, p. 86: ' ..changing the size of the main cct high speed bleed changes the slope, so if the mixture is leaner at the top end, reducing...
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    Annular boosters on a Tunnel Ram

    Post #45. ' Larger air bleed starts the mains sooner '. Nope. When RB quoted the info from post #41 into his post #45, he got it wrong. What post #41 said: ' With more air coming in the bleed...'. A vital but important distinction. What causes 'more air' to come through the [ air ]...
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    Annular boosters on a Tunnel Ram

    Demon, Your understanding is correct about creating emulsion. But emulsion is getting mixed up with when the system starts & the relationship THAT has to the MAB. The smaller AB starts the system earlier & vice versa.
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    Annular boosters on a Tunnel Ram

    Aww shucks..... We are only at 38 posts. The UT/DV thread is over 580....
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    Annular boosters on a Tunnel Ram

    I don't need to read what I wrote because I know what I wrote'; nor do I need to read Taylor. You asked how does emulsion ABOVE fuel level functions.....& I answered it.
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    Annular boosters on a Tunnel Ram

    I am quite happy to have a civilised discussion with you about emulsion. I am not sure what you mean by function of emulsion above the fuel level? The entry to the booster is 1/4 -1/2" above the fuel level in the fuel bowl, for all venturi style carbs & this is the theoretical level in the main...
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