Need to Boost Reference Dominators
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Need to Boost Reference Dominators

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    Senior Member fastnlight's Avatar
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    Default Need to Boost Reference Dominators

    Does anyone know of a carb shop in Ventura County, CA or the San Fernando Valley, CA that can do this? Have two 1050 Dominators on a 540 with 8/71. I know that Performance Carb and Speed in Ontario, CA can do it, but I was wondering if there was a shop closer to where I live in Ventura. I'm also considering mailing them somewhere, so my second question is who do you recommend nationwide? Anyone is Havasu?

    Before anyone recommends I just square up the jets and remove the power valve, I am also considering that as well. In this post I'm just interested in finding someone that boost references dominators. Thanks for your help.

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    Some guy obnoxious001's Avatar
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    Quote Originally Posted by fastnlight View Post
    Does anyone know of a carb shop in Ventura County, CA or the San Fernando Valley, CA that can do this? Have two 1050 Dominators on a 540 with 8/71. I know that Performance Carb and Speed in Ontario, CA can do it, but I was wondering if there was a shop closer to where I live in Ventura. I'm also considering mailing them somewhere, so my second question is who do you recommend nationwide? Anyone is Havasu?

    Before anyone recommends I just square up the jets and remove the power valve, I am also considering that as well. In this post I'm just interested in finding someone that boost references dominators. Thanks for your help.
    I think Alexi over at Boostpower is close to you, and will do it right.

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    Senior Member fastnlight's Avatar
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    Quote Originally Posted by obnoxious001 View Post
    I think Alexi over at Boostpower is close to you, and will do it right.
    Thanks Barry, I'll check with him.

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    Quote Originally Posted by fastnlight View Post
    Does anyone know of a carb shop in Ventura County, CA or the San Fernando Valley, CA that can do this? Have two 1050 Dominators on a 540 with 8/71. I know that Performance Carb and Speed in Ontario, CA can do it, but I was wondering if there was a shop closer to where I live in Ventura. I'm also considering mailing them somewhere, so my second question is who do you recommend nationwide? Anyone is Havasu?

    Before anyone recommends I just square up the jets and remove the power valve, I am also considering that as well. In this post I'm just interested in finding someone that boost references dominators. Thanks for your help.
    So you believe you are still pulling a vacuum at WOT with two dominators and that is closing the power valves ?
    Did you check manifold vacuum at WOT with a gauge ?

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    Senior Member fastnlight's Avatar
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    Quote Originally Posted by Mark55 View Post
    So you believe you are still pulling a vacuum at WOT with two dominators and that is closing the power valves ?
    Did you check manifold vacuum at WOT with a gauge ?
    Well, in theory, yes, but I'm not sure. I haven't put a guage on it at wide open throttle. Do you think I will be pulling a vacuum? I honestly do not know.

    I talked to Teague and they have never boost referenced and said they never will. They can set the carbs up with power valves and jets based on my engine specs. Still waiting to hear from Boost Power. I am not set on either method.

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    Dan Davinci 281-964-7782..worth a call

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    Senior Member fastnlight's Avatar
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    Quote Originally Posted by Gone Green View Post
    Dan Davinci 281-964-7782..worth a call
    Thanks


    Sent from my iPhone using Tapatalk

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    Quote Originally Posted by Mark55 View Post
    So you believe you are still pulling a vacuum at WOT with two dominators and that is closing the power valves ?
    Did you check manifold vacuum at WOT with a gauge ?
    LOL....unless the blower has no rotors in it you certainly will not have vacuum @ WOT! The reason for running power valves on a blower motor is so you can still run a leaner jet on the primary side at idle and low speed. You boost reference them simply because once the blower motor makes boost.....there is no vacuum to open the power valve as originally designed. Jocko

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    Quote Originally Posted by jockorace View Post
    LOL....unless the blower has no rotors in it you certainly will not have vacuum @ WOT! The reason for running power valves on a blower motor is so you can still run a leaner jet on the primary side at idle and low speed. You boost reference them simply because once the blower motor makes boost.....there is no vacuum to open the power valve as originally designed. Jocko

    Vacuum holds the power valve closed. The power valve opens when manifold vacuum drops below the number on the power valve.
    This is the problem when power valves are discussed is most don't understand how they work.

    When I ran carbs years ago and the same old boost referencing discussion came up I checked the WOT manifold vacuum below the carbs and above the blower. 540 CI , Hampton 8-71 , two 850 Holley carbs. Showed 0 vacuum at WOT. That showed that the power valves were open. Boost referencing would have served no purpose.

    So now I'm waiting for the inevitable, " sometimes you can be making boost and still show vacuum "

    Damn am I glad I don't run carbs anymore

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    steelcomp was here
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    Think about the whole purpose of a power valve in the first place. It has nothing to do with WOT.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

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    Quote Originally Posted by scott foxwell View Post
    Think about the whole purpose of a power valve in the first place. It has nothing to do with WOT.
    Certainly, but the discussion was about the need for boost referencing which would only apply if the engine was pulling enough vacuum to close the power valve(s) at WOT. I have never seen that happen yet.

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    steelcomp was here
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    Quote Originally Posted by Mark55 View Post
    Certainly, but the discussion was about the need for boost referencing which would only apply if the engine was pulling enough vacuum to close the power valve(s) at WOT. I have never seen that happen yet.
    They don't actually close at WOT...they never open and it happens all the time. We're not talking about manifold vacuum, we're talking about vacuum below the carb and when the blower starts building boost, it can create more vacuum under the carb @ WOT, not less, and then the power valves never open like they're supposed to. They're supposed to stay closed till vacuum drops under higher engine load, then when vac drops, they open and add more fuel. It's an enrichment circuit. "Boost referencing" uses the positive pressure in the manifold to overcome the additional vacuum under the carb and allows the PV's to work like they're supposed to.
    If God is your co-pilot, change seats!
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    Quote Originally Posted by scott foxwell View Post
    We're not talking about manifold vacuum, we're talking about vacuum below the carb and when the blower starts building boost, it can create more vacuum under the carb @ WOT, not less, and then the power valves never open like they're supposed to.
    Yes I understand the power valves read vacuum from the carb base. I checked it and read 0 vacuum @ WOT so I knew the power valves were open. The Hampton blower was 28% overdriven. Damn roots blower couldn't make a significant boost number no matter how much Overdrive I put to it. I Sold it and would never own one again.

    I know what I read on the gauge. As usual we disagree and that's fine, no worries.

    I don't know why I responded to this thread. I swore off carbs 14 years ago.

    I guess I had,

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    Or Seth, either one Budweiser's Avatar
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    Quote Originally Posted by Mark55 View Post
    ...
    So now I'm waiting for the inevitable, " sometimes you can be making boost and still show vacuum "
    The important question would be, what is the absolute pressure under the blower when the pressure above the blower (under the carbs) is at the PV value? When speaking of PV's, who cares what the pressure under the carb is at WOT??? I really don't think that was the topic up for discussion.

    I'm only guessing that, if Teague never uses BRPV's that they're definitely choosing PV values that correlate to a certain pressure in the manifold (under the blower) and not relying on the stamped value. Can't see any other way to get the enrichment to occur when ya want it to. What do you think?

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