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Thread: 62 / BT7 carb questions

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    Jedi Warrior Drone Dog's Avatar
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    62 / BT7 carb questions

    IMG_0263.jpgstarting pulling out the carbs and parts today. the PO had them rebuilt.

    2 questions)

    1) i always thought the SU carbs with the brace on the neck did not use vented caps. the ones on these carbs have a hole in them. am i correct there?

    2) what do you all use for vent pipes on the carbs and how do you run them?

    Thanks

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    Yoda steveg's Avatar
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    Re: 62 / BT7 carb questions

    Your car looks like a tri-carb. The Moss catalog shows flexible tubing attached to the stubs on your carbs.
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    Re: 62 / BT7 carb questions

    Hi TL,
    If I'm reading your question correctly, the vent pipes are for overflow and should be connected to tubes that run down past the manifolds and empty on to the ground. I've never actually seen the correct tubes or routing, but I just ran flexible fuel line down through appropriate places (away from the exhaust manifold). Maybe someone else has more information.
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    Re: 62 / BT7 carb questions

    Keith
    Thanks. so you just used a clear fuel line?

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    Re: 62 / BT7 carb questions

    Quote Originally Posted by Drone Dog View Post
    Keith
    Thanks. so you just used a clear fuel line?
    NO Generally, I have seen black vinyl tubing used.
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    Re: 62 / BT7 carb questions

    I've used both clear neoprene and black vinyl. They both became distorted and brittle from the heat. I made permanent pipes from 3/16" brake line tubing, joined to the Healey stubs with short lengths of rubber tubing and clipped to the inside of the fender with a Moss dual pipe clip 585-595:

    PipeClipDualMoss585-595.jpg
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    Re: 62 / BT7 carb questions

    thanks. i will look in to that. i have some old brake lines left over. guess some soft copper tubing would do the same thing.

    speaking of heat. i read somewhere that having the exhaust manifolds done with a ceramic coating keeps a lot of the heat in the pipe and can reduce heat in the engine bay by 25%. has anyone tried that?

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    Yoda
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    Re: 62 / BT7 carb questions

    Quote Originally Posted by Drone Dog View Post
    ... speaking of heat. i read somewhere that having the exhaust manifolds done with a ceramic coating keeps a lot of the heat in the pipe and can reduce heat in the engine bay by 25%. has anyone tried that?
    Yep. Only succeeded in reducing the weight of my wallet by 25%. But, seriously, the heat in the engine bay was probably reduced by coating the manifold and wrapping the downpipes, it just didn't produce any noticeable improvement in performance or vapor lock. You might see something on a dyno, but high-heat paint looks as good and is a lot cheaper.

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    Re: 62 / BT7 carb questions

    Quote Originally Posted by Drone Dog View Post
    thanks. i will look in to that. i have some old brake lines left over. guess some soft copper tubing would do the same thing.

    speaking of heat. i read somewhere that having the exhaust manifolds done with a ceramic coating keeps a lot of the heat in the pipe and can reduce heat in the engine bay by 25%. has anyone tried that?
    I have tube headers ceramic coated inside and out. They are quieter - much like the cast iron manifolds; they aren't as hot that way either. Gets rid of the tinny sound tube headers make.
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    Re: 62 / BT7 carb questions

    Quote Originally Posted by steveg View Post
    I have tube headers ceramic coated inside and out. They are quieter - much like the cast iron manifolds; they aren't as hot that way either. Gets rid of the tinny sound tube headers make.
    Ditto.



    A dozen years later, they're a bit duller, but no areas are flaking off. They were coated in/out from new, before they were ever run on the engine, and I think that has a lot to do with coating integrity.
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    Re: 62 / BT7 carb questions

    thanks for the info. using the stock manifolds. i had some POR15 left over and have used that. never had great luck with it staying on for a long time. but i never had a way to blast the manifold before. i blasted these, did not touch them and i used metal prep on them before painting. i got some time before they will go on so i am putting them in front of the heater in the shop to help cure the paint before i mount.

    i would look to have them coated if i thought they would really help with the heat situation.

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    Re: 62 / BT7 carb questions

    Back to fuel/vent hose arrangements.

    Pix from Stretchit2's ex-Bill-Bolton BN7 mkII. Clear vent tubes bent 90 degrees with springs inside, length only about 3"
    TricarbF.jpg Front

    TricarbR.jpg Rear

    TricarbAll.jpg All
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    Re: 62 / BT7 carb questions

    I found one of those elbows today in one of the boxes. Going to loo for a couple more now.
    guess they did not worry about extending down below the manifold....

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    Obi Wan
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    Re: 62 / BT7 carb questions

    The flexible vent tubes on my 62 / BT7 mkII don't extend any further than the BN7's. When the needles went bad I switched to Grose Jets [ball bearing] and they never vented gouts of raw fuel again.
    Last edited by elrey; 11-13-2017 at 10:25 AM. Reason: Splendid photos Steve.
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