holley (adjustable) jet plates
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holley (adjustable) jet plates

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    Default holley (adjustable) jet plates

    Are the adjustable jet plates for holley's "marine approved" or a good idea for a marine engine? I am looking at the percy's adjust-a-jet, altho I think there are others similar. These plates basically do away with jets and have a needle that regulates fuel, and is externally adjustable. The external adjustment part makes me suspicious that it isnt cool for marine use. I know the old saying.. jet it, set it, forget it... but the whole process of dumping bowls of gas all over the place to change jets doesnt seem very desireable to me anymore. Thoughts?

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    Seriously off center slowride's Avatar
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    Quote Originally Posted by slim pickens View Post
    Are the adjustable jet plates for holley's "marine approved" or a good idea for a marine engine? I am looking at the percy's adjust-a-jet, altho I think there are others similar. These plates basically do away with jets and have a needle that regulates fuel, and is externally adjustable. The external adjustment part makes me suspicious that it isnt cool for marine use. I know the old saying.. jet it, set it, forget it... but the whole process of dumping bowls of gas all over the place to change jets doesnt seem very desireable to me anymore. Thoughts?
    I run it on the primaries on my BB Mustang. There are no leaks, so I see no reason not to use it on a boat. The carb will increase in length the thickness of teh plate, so make sure you can adapt the air cleaner/arrester and fuel feeds.

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    Half a bubble off jrork's Avatar
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    This is an interesting. These coupled with a A/F monitor "seems" like a slick setup and I too would like to hear others thoughts if for no other reason than to get some discussion going.

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    I don't feel tardy Hallett Dave's Avatar
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    I have them on the primary & secondary side of my Holley 750 DP. They have been on for 6 years and I have never had an issue with them leaking.
    Your engine will never know the difference, as long as it gets the correct amount of fuel.
    Metered fuel is just what it is, metered fuel.
    Quote Originally Posted by Futs View Post
    Im non induced and My turd leaves pretty hard as she sits.

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    I was mainly concerned about leakage/seepage around whatever seal they have for the jet adjustment. Now that I think about it, it wouldnt be much different than the (original holley) seals on the float level adjustment. Or something similar anyway.

    will an air/fuel meter (o2 sensor I guess) work in wet exhaust?

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    You have to keep the O2 sensor dry, water will destroy the sensor. Some people have bungs welded into the manifolds or headers so the sensor is placed before the water is mixed with the exhaust flow.

    Doug

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