7X Exhuast System

[Deleted User]
[Deleted User]
edited November 2011 in HUDSON
Here is a pic of the headpipe portion of the two piece 7X exhaust system... I don't have a pic of the split exhaust portion but you can see the bottom of it's bolt flange. It is the upper portion that is being reproduced now.


Comments

  • StillOutThere
    StillOutThere Expert Adviser
    Here is an original set of actual 7X main exhaust manifold, 7X original elbow, and 7X head pipe. I took these out of a '53 Super Wasp sedan, a Colorado car with the "mountain motor" option. It was a stick, Twin-H, 7X exhaust car. That would have been about 1965 or so!!! Gave it away to a friend for his birthday.





  • Lee ODell
    Lee ODell Senior Contributor
    edited November 2011
    Thanks for the pictures. Was there a exhaust damper in the 7X exhaust manifold? How did the 7X exhaust manifold differ from the regular exhaust manifold?

    Lee O'Dell
  • [Deleted User]
    [Deleted User]
    Yup, thats the same one. Thanks for the pics!
  • Lee ODell
    Lee ODell Senior Contributor
    edited December 2011
    Thanks for the pictures. Will someone post the part numbers for the 7X Twin-H intake manifold, exhaust manifold and duel exhaust elbow as shown in pictures?

    Thanak you in advance.
    Have a good evening.
    Lee O'Dell
  • StillOutThere
    StillOutThere Expert Adviser
    There was no heat riser valve in the 7X exhaust as is typical of any high performance, racing header.
  • Lee ODell
    Lee ODell Senior Contributor
    StillOutThere wrote:
    There was no heat riser valve in the 7X exhaust as is typical of any high performance, racing header.

    Thank you for the information.

    WOW! What a great birthday present. Can we be friends. he he

    Have a good day
    Lee O'Dell
  • [Deleted User]
    [Deleted User]
    Lee:
    If your having a birthday, we hope you had a good one. Thanks for your recent comments on this thread. Bob P
  • bob ward
    bob ward Senior Contributor
    Are there any before and after dyno test results that show the HP gain from a 7X exhaust system versus a standard exhaust system?

    Having a 7X exhaust system provides authenticity and bragging rights, and there's nothing wrong with that, but it seems to me that while the stock manifold is in place, whatever you do downstream from there won't help much in the way of HP.
  • StillOutThere
    StillOutThere Expert Adviser
    It isn't just about the exhaust pipes in the 7X system. It is the fact that the main exhaust manifold is center divided to stop the exhaust from the front three cylinders from COLLIDING with the exhaust from the rear three cylinders when they both are charging toward the center outlet. The manifold is divided and then the elbow is divided and that is why two pipes exit -- each carrying the exploded gases from three cylinders instead of one pipe carrying the gasses of six. See the advantage?
    Then however, under NASCAR rules of the day, a six cylinder car could only exit one pipe over the rear axle, thus Hudson slowly blended the two pipes into one going under the front floorboard.
    Nevertheless, my recollection was the 7X was worth 10-15 extra horsepower.
  • Roger Harmon
    Roger Harmon Expert Adviser
    Hi all,

    So,.. if I install one of Bob P's 7X exhaust adapters am I getting that same 'splitting' affect, or do I need the 7X exhaust manifold too?

    R/ Roger.
  • Lee ODell
    Lee ODell Senior Contributor
    edited December 2011
    Roger Harmon wrote:
    Hi all,

    So,.. if I install one of Bob P's 7X exhaust adapters am I getting that same 'splitting' affect, or do I need the 7X exhaust manifold too?

    R/ Roger.

    Hi Roger

    The stock exhaust manifold has a gradual transition away from 3&4 cylinders leading to the divider. The divider ends 1" before reaching the gasket surface because of the exhaust damper. My exhaust manifold damper has been removed.

    Bob's 7X adaptor's divider starts 1 1/2" down stream from the gasket surface and transitions 6 1/2" and forms the dual exhaust outlets. After checking another exhaust manifold, with a damper, reveals the damper butterfly, when open, extends into the adaptor. Therefore, Bob provided a 7X adaptor that can be used on a stock exhaust manifold with damper, saving alot of extra work removing intake/exhaust mainfolds required to remove damper.

    Without a damper, the gap between manifold dividers may help equalize exhaust pressures between l,2,3 cyl and 4,5,6 cyl before going into the dual exhaust system. On a true 7X exhaust system, if no divider gap between manifold and adaptor, the two exhaust pipes merge into a single pipe where pressures equalize.

    From the 7X pictures I could not tell where the dividers ended in relation to the gasket surfaces. I'll have to leave those measurement to someone that have the original 7X manifold and adaptor.

    Bob's adaptor is afforable. The whole true 7X system, if one could be found, would be very very expensive.

    I hope this helps.
    Lee O'DEll
  • StillOutThere
    StillOutThere Expert Adviser
    The central divider in the 7X main manifold is continuous to the elbow flange. The 7X elbow is divided from manifold flange to the dual pipe outlet. The 7X manifold to elbow gasket has gasket material across the center of it for this conjoining. In the real 7X system, the exhaust gases of 123 do not meet 456 until the head pipe starts to blend as previously outlined to meet NASCAR rules.
  • Lee ODell
    Lee ODell Senior Contributor
    edited December 2011
    Thanks for the information. I was wondering about that. Another question. Does the 7X exhaust outlet exit at the same angle as stock or exit angle slightly in another direction? From the pictures it looks like the exit may be angled slightly away from the engine.

    After my last post I realized the damper butterfly once open probably acts as a partial divider between the two dividers on stock manifold and Bob's adaptor. Just another observation.

    Have a great day.
    Lee O'Dell
  • StillOutThere
    StillOutThere Expert Adviser
    My recollection is that the elbow and two pipes basically exit at the same angle or direction as the stock single pipe. The pretty much have no choice considering things like toeboard sheet metal and rear motor mounts don't move. And the "blend pipe" ends up to rear at exactly the same spot as the original single.
  • bob ward
    bob ward Senior Contributor
    StillOutThere wrote:
    The central divider in the 7X main manifold is continuous to the elbow flange. The 7X elbow is divided from manifold flange to the dual pipe outlet. The 7X manifold to elbow gasket has gasket material across the center of it for this conjoining. In the real 7X system, the exhaust gases of 123 do not meet 456 until the head pipe starts to blend as previously outlined to meet NASCAR rules.

    Thanks for that StillOutThere, you've clarified details about the standard manifold v the 7X manifold I was never real sure about.
  • Lee ODell
    Lee ODell Senior Contributor
    StillOutThere wrote:
    My recollection is that the elbow and two pipes basically exit at the same angle or direction as the stock single pipe. The pretty much have no choice considering things like toeboard sheet metal and rear motor mounts don't move. And the "blend pipe" ends up to rear at exactly the same spot as the original single.

    I ment to ask the angle of the exhaust manifold exit that the adaptor mounts too. Thanks for helping clear up alot of questions.

    Lee O'DEll
  • StillOutThere
    StillOutThere Expert Adviser
    The exhaust manifold bottom /exit surface is 'horizontal' or same as the standard manifold. Again, this is from recollection. But I did give it a lot of studying back in the years that I owned the whole combination.
  • [Deleted User]
    [Deleted User]
    Thanks to all contributors of this thread. I'm still learning and appreciate the comments and info.
    I would still like to meet and talk to the original maker of the moulds and dies for making the dual outlet exhaust manifold adapters we sold. If any one knows who built the moulds and dies, please call or PM, or email me. hetpbebop@gmail.comhet Thanks, Bob P
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