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Intake manifold questions and comments

Discussion in 'The Garage' started by Shaun Chandler, Nov 5, 2011.

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  1. drewpy

    drewpy Excess twin Top Contributor

    I think Mikuni et al, would have used Alu if it caused probelms, the reason they use brass is that it must be more stable near heat applications
     
  2. bcware

    bcware Well-read Top Contributor

    All of the brass fittings on the stockers are pressed in; I think the reaction he is talking about applies to trying to weld them together.

    Now you've all got me thinking about why brass fittings are used. I can't really find anything for information, but I have to imagine it's because it doesn't rust and is soft enough to easily produce tight fittings in an aluminum body.

    Brass melts a good 500 degrees (F) above aluminum, but even aluminum can take 1200 F.
     
  3. Hey guys

    I'm not worried about how the aluminum will stand up to the heat of the engine. It already has alot of aluminum and aluminum is highly conductive like copper and brass.

    The reaction I was talking about is the natural reaction for dissimilar metals to corrode when they come into contact. Since they are not of the same type you can't easily weld them together. You can weld things like steel to stainless because they are both iron based. You just have to pick the right filler rod. Brass is stronger the copper due to being alloyed with zinc it also doesn't tarnish like copper normally would.

    Aluminum should be a good match The flange is already aluminum so making th vacuum fitting aluminum shouldn't be an issue.

    Shaun
     
  4. drewpy

    drewpy Excess twin Top Contributor

    suck it and see then... geddit vacuum? suck it and see?......never mind
     
  5. Charles

    Charles XS400 Addict

    Hey Shaun...how's school? Any updates? huh, huh??
     
  6. NicksXS

    NicksXS XS400 New Member

    MikesXS.com sells a billet aluminum boot. The only difference is the vacuum/sync port is not on the aluminum. You could tap them to have a sync port but I haven’t really found any other reason why you would need them beside to do a dynamic sync.
     
  7. xschris

    xschris XS400 Guru Top Contributor

    When syncing carbs you need to do it at idle and the bike warm. If you don't have any ports this can't be done. There are gauges that go directly into the mouth of the carbs but I don't think they would fit into the space and you should have all the intake/air boxes hooked up when doing this. If you want a good running bike a sync is a must.
     
  8. Travis

    Travis Staff Member Staff Member

    @NicksXS Welcome to the site. You did just bump an almost 7 year old thread though. :D
     
    xschris likes this.
  9. NicksXS

    NicksXS XS400 New Member

    I didn’t look at the date. Lol
     
  10. Leviathan

    Leviathan XS400 Member

    Hey, any chance you have a .dxf or .dwg file for the flange you would want to share?
     

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