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Thread: Healey 100M Cold Air Box Hose Fitting

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    Healey 100M Cold Air Box Hose Fitting

    I have purchased an original reproduction Healey 100M 4" rubberized canvas over wire air box hose from A H SPARES in the U.K.. It will collapse and clamp on the end of the cold air box as it came from the factory. However, I am not sure how to approach the fitting. Do you have to cut the bottom of the hose so it can overlap and secure a tight fitting? I don't want to start cutting if there is another method as the hose was expensive.
    Thanks for any help!

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    Darth Vader Michael Oritt's Avatar
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    Re: Healey 100M Cold Air Box Hose Fitting

    If you have the correct hose and CAB the hose should go over the end of the box and secure with a hose clamp. This assumes that your car is equipped with the special angled support for the shroud that creates room for the hose, even with the correct bracket--or no bracket at all as some folks have done--in any case it is not an easy job to do. DW sells, or used to sell, a rectangle to round sheet metal adaptor that plugs into the end of the CAB and offers a circular end that more easily and neatly fits to the hose, but even with it I still had problems making the hose transition from the grill to the CAB and had a custom-made aluminum adaptor made.

    After many years of struggling I recently removed the CAB as I was tired of slicing up my hands and arm when attempting to adjust the carbs, etc. It's an iconic piece of gear but it is questionable whether it really delivers any performance benefits and it certainly has its drawbacks.

    All that said, good luck!

    Best--Michael Oritt
    1954 Austin-Healey 100 Lemans
    1958 Elva Courier
    1959 Elva MK IV Sports Racer
    1961 Ginetta G4

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    Re: Healey 100M Cold Air Box Hose Fitting

    Thanks for the info, I have experienced every thing you said, but was hoping for a silver bullitt I am currently running a David Welsch sausage filter which is easy to work on carbs, runs well but obviously does not look as good as the CAB.
    Working in the CAB area has a way of eating your hands up!

  4. #4

    Re: Healey 100M Cold Air Box Hose Fitting

    I've had the same problem trying to fit the hose. I also don't like the idea of not having a filter. I tried adding a K&N filter and mounting to the wheel well but had trouble keeping it in place. I read on this forum (can't find the reference) or somewhere else that testing showed velocity stacks added more to performance than the CAB. I've also seen examples of people drilling a hole in the end of the CAB because they felt that back carb was getting starved. All that said, I think going to velocity stacks with filters is my next step.

    Michael Pittsburgh PA USA

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    Re: Healey 100M Cold Air Box Hose Fitting

    Quote Originally Posted by MikeAH100M View Post
    I've had the same problem trying to fit the hose. I also don't like the idea of not having a filter. I tried adding a K&N filter and mounting to the wheel well but had trouble keeping it in place. I read on this forum (can't find the reference) or somewhere else that testing showed velocity stacks added more to performance than the CAB. I've also seen examples of people drilling a hole in the end of the CAB because they felt that back carb was getting starved. All that said, I think going to velocity stacks with filters is my next step.
    That may have been me. I read an article years ago about a 100 racer who tested on a dyno and found velocity stacks yielded more HP than the CAB. I used the DWR adapter and some of the rigid tubing as used in the fresh air port, fashioned an adapter bolted it to the top of the steering box with a K&N filter (the adapter had to be modified to fit the tubing).

    IMG_1398.JPG

    IMG_1401.JPG
    Last edited by Bob_Spidell; 06-20-2017 at 12:06 PM.

  6. #6

    Re: Healey 100M Cold Air Box Hose Fitting

    Never thought of strapping it to the steering box. Great idea! Thanks

    Michael Pittsburgh PA USA

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    Re: Healey 100M Cold Air Box Hose Fitting

    Quote Originally Posted by Bob_Spidell View Post
    That may have been me. I read an article years ago about a 100 racer who tested on a dyno and found velocity stacks yielded more HP than the CAB. I used the DWR adapter and some of the rigid tubing as used in the fresh air port, fashioned an adapter bolted it to the top of the steering box with a K&N filter (the adapter had to be modified to fit the tubing).

    IMG_1398.JPG

    IMG_1401.JPG
    You can do both the CAB and Low Profile Velocity stacks like this (https://www.minimania.com/part/SS53/...illet-Aluminum) They make them for 1.5, 1.75 & 2" SU's I used to use this type on my Spridget Racer years ago and they do work well.

    Cheers,
    Dan M.

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    Re: Healey 100M Cold Air Box Hose Fitting

    IIRC, the CAB is fitted with studs that go through the carb bodies. I don't see how you'd fit these in a CAB. I do have these on my BJ8 with K&N filters.

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    Darth Vader Michael Oritt's Avatar
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    Re: Healey 100M Cold Air Box Hose Fitting

    I recently put in velocity stacks in place of the CAB. I really have not noticed any increase in performance but they look and sound great and my forearms appreciate the swap. At the time of this photo a small breather/reservoir venting from the valve cover was still installed, clamped to the front velocity stack, but I removed it when I last adjusted the carbs and have gone to a straight hose since there is no perceptible blow-by.
    Attached Images Attached Images

    Best--Michael Oritt
    1954 Austin-Healey 100 Lemans
    1958 Elva Courier
    1959 Elva MK IV Sports Racer
    1961 Ginetta G4

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    Re: Healey 100M Cold Air Box Hose Fitting

    Quote Originally Posted by Bob_Spidell View Post
    IIRC, the CAB is fitted with studs that go through the carb bodies. I don't see how you'd fit these in a CAB. I do have these on my BJ8 with K&N filters.
    Probably have to replace the studs with bolts & nuts. Might be a bit fiddly, but I bet it could be modified to work.

    Dan M.

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    Re: Healey 100M Cold Air Box Hose Fitting

    The original cold air box was attached with bolts. Unlike one replica version of the CAB that apparently uses some form of nutsert fixed to the aluminum box, the originals had a metal plate with welded nuts that was riveted to the inside of the CAB. I have seen that Sports and Classics (NFI) sells a replica that uses this OEM style mounting. The OE style would definitely not allow fitting of any sort of velocity stack. The "other" replica could probably be modified to allow use of the Low Profile Velocity stacks without too much trouble.

    It would be very easy to fit studs to an OE CAB, although that might actually make it harder to get all 4 lined up at one time. I have considered doing this on several occasions.

    Currently my CAB is on the shelf awaiting some crack repairs. In its place I have fitted the low profile velocity stacks inside a pair of Lynx-type foam filters. Hope to find out shortly how it runs and sounds with this setup.

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    Yoda Randy Forbes's Avatar
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    Re: Healey 100M Cold Air Box Hose Fitting

    Quote Originally Posted by CraigC View Post
    The original cold air box was attached with bolts. Unlike one replica version of the CAB that apparently uses some form of nutsert fixed to the aluminum box, the originals had a metal plate with welded nuts that was riveted to the inside of the CAB. I have seen that Sports and Classics (NFI) sells a replica that uses this OEM style mounting. The OE style would definitely not allow fitting of any sort of velocity stack. The "other" replica could probably be modified to allow use of the Low Profile Velocity stacks without too much trouble.

    It would be very easy to fit studs to an OE CAB, although that might actually make it harder to get all 4 lined up at one time. I have considered doing this on several occasions.

    Currently my CAB is on the shelf awaiting some crack repairs. In its place I have fitted the low profile velocity stacks inside a pair of Lynx-type foam filters. Hope to find out shortly how it runs and sounds with this setup.
    Ignoring the fact that my engine has a couple of extra cylinders (and 3X the openings) that's pretty much how this unified air filter housing & low profile velocity stub-stacks are attached. The Webers already have studs in them (5 or 6 mm dia./nuts are 10 mm across flats, and requires a highly modified open-end wrench to access them). Standard Weber rectangular x 1-3/4" high filter elements straddle the stubs-stacks, and a stainless steel panel slips in to secure them.

    I made the box a 2-piece design in the likeness of a 100M CAB, but it would've starved the engine of air without the added holes in the ss panel and the box itself.



    Test-fitting the cover, before holes were punched. Hard to describe, but with slots in the top of the box, it slips inside the opening at the ends and bottom for a very secure fit, only requiring screws along the top (had to be able to remove/replace cover for filter maint.).





    Holes were cut with a Greenlee 1/2" conduit K/O punch (7/8" dia.) and then belled with a punch & die a machinist friend made for me.

    http://www.britishcarforum.com/bcf/image.php
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    Re: Healey 100M Cold Air Box Hose Fitting

    Quote Originally Posted by DTDuck View Post
    Probably have to replace the studs with bolts & nuts. Might be a bit fiddly, but I bet it could be modified to work.

    Dan M.
    Dennis Welch does sell a CAB to fit velocity stacks (https://www.bighealey.co.uk/Austin-H...-2-su-cful246b) Of course that does mean you have to go with 2" SU's.

    Cheers,
    Dan M.

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