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Old 12-10-2014, 11:25 PM
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Default Carb talk

Whats the preffered way to set up a marine carb as far as secondary opening. 40% left, 60% left or 1:1?

Also is there a point to powervalve in a boat. Boost referenced .. dumping 8-10 jet sizes of fuel because I hit 1# of boost (pretty sure thats how it works) seems unnecessary. It`s not a car where you hit the gas every other stop light and need that fuel enrichment.

To me (carb newb but fresh eyes) I`d set up a marine application carb with 1:1 primary/secondary and block off the powervalves. Tune it that way.

Last edited by ICDEDPPL; 12-10-2014 at 11:33 PM.
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Old 12-10-2014, 11:44 PM
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dan,the power valve stops it from being to rich in no boost running,when you start making boost you need to ritchen it up.the boost ref blower carbs[quick fuel]come with a 4.5 power valve and on my engines i did not need to change from that.with your a/f gage you will see a steady line almost the same from 2500 all the way up at wot.
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Old 12-11-2014, 12:14 AM
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I boost reference both primary & secondary, and have progressive linkage opening of the secondary butterfly's. Why would you not want the motor to tell the carbs what it needs??? I have a great fuel cure from idle all the way to WOT. There are times that my secondaries are just a little open and I m still pulling vacuum. To me blocking off power valves is going back to the stone age
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Old 12-11-2014, 12:23 AM
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Rookie boost referencing question . Do I run vac line from these ports on the carbs to ports under the blower in the intake and can I T them or do they have to be separate ?

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Old 12-11-2014, 12:28 AM
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i can see a drag car with no power valve and 8-10 jet sizes larger because it is either ideling or wide open but in a blown boat deal forget it.most of the time the boat engine will be in vacuum or low boost.
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Old 12-11-2014, 12:29 AM
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Originally Posted by the deep
Rookie boost referencing question . Do I run vac line from these ports on the carbs to ports under the blower in the intake and can I T them or do they have to be separate ?

Very nice by the way...Yes you can tee them, I have all 4 of mine coming of my carbs tee'd into my vac/boost line going to my gauge on the helm.
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Old 12-11-2014, 12:32 AM
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Originally Posted by mike tkach
i can see a drag car with no power valve and 8-10 jet sizes larger because it is either ideling or wide open but in a blown boat deal forget it.most of the time the boat engine will be in vacuum or low boost.
Mike I totally agree with you on that
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Old 12-11-2014, 12:32 AM
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Originally Posted by the deep
Rookie boost referencing question . Do I run vac line from these ports on the carbs to ports under the blower in the intake and can I T them or do they have to be separate ?

t them togeather and run one line under the blower in the intake manifold.DO NOT run the vac line to the carb adapters.
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Old 12-11-2014, 12:35 AM
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Originally Posted by Bawana
Mike I totally agree with you on that
that is because us blown fountain guys think alike!
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Old 12-11-2014, 12:39 AM
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Thanks B wan .
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