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BRINGING IT ALL TOGETHER.... A's, G's & E's


5 posters

    Installing two REAR EFI manifolds on the 240, and staying inside the doghouse

    jdlaugh
    jdlaugh


    Number of posts : 298
    Location : Tulsa, OK
    Registration date : 2013-03-18

    Installing two REAR EFI manifolds on the 240, and staying inside the doghouse Empty Installing two REAR EFI manifolds on the 240, and staying inside the doghouse

    Post by jdlaugh Sat Aug 19, 2017 2:33 pm

    I’ve long wanted to adapt the modern, higher flowing EFI manifolds for my 240 engine, but the front manifold sticks out too far and I didn’t want to modify the doghouse or floor. Fellow Econoliner Terrance Kritzberg kindly mentioned in a recent Facebook post that two rear manifolds might work with modification. And, he was right.

    I had to do a little cutting and brazed on a flange, but it was a fairly simple project and the fit is good. I’ve only bolted on the front so far, but the rear manifold should be even easier. There is plenty of clearance.

    The downpipe from the front manifold could go over the top of the motor mount and cross member with a really sharp bend, or drop straight down and then 90 under the cross member.

    I think this setup will flow dramatically better than the old log manifold, and will be a great complement to my custom TBI setup. Cost for the two rear manifolds was just over $50 from my local salvage.

    Here are some pics. I had to make 3 cuts, marked in red, and grind down one tab to the right height for the mounting bolts, then finally braze on the flange.

    Looks clean with plenty of room to clear the doghouse. I think this will be easy to wrap with header wrap or a heat shield and should dramatically reduce heat in the doghouse.

    Installing two REAR EFI manifolds on the 240, and staying inside the doghouse Front_10

    Required cuts marked in red. Note the upper left must leave a tab for the mounting bolt similar to the one in the center.

    Installing two REAR EFI manifolds on the 240, and staying inside the doghouse Length10

    For some reason one of the bolts on the back manifold is in the center instead of on the edge, so the flange must be trimmed and profiled.

    Installing two REAR EFI manifolds on the 240, and staying inside the doghouse Flange10

    The cutoff tab needed to be profiled to match the one in the center.

    Installing two REAR EFI manifolds on the 240, and staying inside the doghouse Ear_ne10

    I had to remove about an 1/8th of material with a dremel.

    Installing two REAR EFI manifolds on the 240, and staying inside the doghouse Thinni10

    The final step was brazing on a flange. I used standard bronze flux-coated rod with an oxy/acetylene torch. This is my only area of concern -- will the braze job hold. It's not carrying a load or under much stress, but some have warned the extreme heat of the manifold may weaken the brass braze over time and lead to failure. If it fails, I'll clean up the area and try stick welding.

    Installing two REAR EFI manifolds on the 240, and staying inside the doghouse Ear_br10


    Last edited by jdlaugh on Sun Aug 20, 2017 1:14 pm; edited 2 times in total
    Zonk 1/75
    Zonk 1/75


    Number of posts : 91
    Location : Yachats Oregon
    Registration date : 2016-06-24

    Installing two REAR EFI manifolds on the 240, and staying inside the doghouse Empty Re: Installing two REAR EFI manifolds on the 240, and staying inside the doghouse

    Post by Zonk 1/75 Sun Aug 20, 2017 10:48 am

    nice....
    Wolfster
    Wolfster


    Number of posts : 140
    Location : Omaha, Ne
    Registration date : 2016-08-27

    Installing two REAR EFI manifolds on the 240, and staying inside the doghouse Empty Re: Installing two REAR EFI manifolds on the 240, and staying inside the doghouse

    Post by Wolfster Sun Aug 20, 2017 3:19 pm

    JD, you do some damn nice technical posts! Thanks for sharing your efforts.
    jdlaugh
    jdlaugh


    Number of posts : 298
    Location : Tulsa, OK
    Registration date : 2013-03-18

    Installing two REAR EFI manifolds on the 240, and staying inside the doghouse Empty Re: Installing two REAR EFI manifolds on the 240, and staying inside the doghouse

    Post by jdlaugh Mon Aug 21, 2017 5:58 am

    Thanks. I hope somebody finds the info useful.
    Seth G
    Seth G
    Vintage-Vans Listings Manager
    Vintage-Vans Listings Manager


    Number of posts : 2086
    Location : Anacortes, WA
    Age : 50
    Registration date : 2013-04-24

    Installing two REAR EFI manifolds on the 240, and staying inside the doghouse Empty Re: Installing two REAR EFI manifolds on the 240, and staying inside the doghouse

    Post by Seth G Tue Aug 29, 2017 5:32 pm

    If I had a 240/300 truck I'd be all over this.
    jdlaugh
    jdlaugh


    Number of posts : 298
    Location : Tulsa, OK
    Registration date : 2013-03-18

    Installing two REAR EFI manifolds on the 240, and staying inside the doghouse Empty Re: Installing two REAR EFI manifolds on the 240, and staying inside the doghouse

    Post by jdlaugh Sat Sep 16, 2017 3:09 pm

    To make the rear manifold work, I had to cut off the two ears at the top, similar to what I did with the front manifold. Once I had both manifolds modified and painted, I broke out the welder and tacked together the front half of the exhaust system. I bought two mandrel 90s to help with routing, but had to cut and tack a 25 degree angle on each pipe to get the correct arc. In the end, I ended up with an arch of 115 degrees (90 plus 25) on each piece of 2" aluminized exhaust tubing. Good clearance from the floors and the starter. First time I've tried something like this, but I'm happy with how it's going so far!

    Installing two REAR EFI manifolds on the 240, and staying inside the doghouse Test_m10

    Installing two REAR EFI manifolds on the 240, and staying inside the doghouse Test_t10

    Installing two REAR EFI manifolds on the 240, and staying inside the doghouse Test_b10

    Installing two REAR EFI manifolds on the 240, and staying inside the doghouse Test_s10


    Last edited by jdlaugh on Mon Sep 18, 2017 9:42 am; edited 2 times in total
    Seth G
    Seth G
    Vintage-Vans Listings Manager
    Vintage-Vans Listings Manager


    Number of posts : 2086
    Location : Anacortes, WA
    Age : 50
    Registration date : 2013-04-24

    Installing two REAR EFI manifolds on the 240, and staying inside the doghouse Empty Re: Installing two REAR EFI manifolds on the 240, and staying inside the doghouse

    Post by Seth G Sun Sep 17, 2017 8:01 am

    That's looking good JD
    jdlaugh
    jdlaugh


    Number of posts : 298
    Location : Tulsa, OK
    Registration date : 2013-03-18

    Installing two REAR EFI manifolds on the 240, and staying inside the doghouse Empty Re: Installing two REAR EFI manifolds on the 240, and staying inside the doghouse

    Post by jdlaugh Mon Sep 18, 2017 9:40 am

    Finished downpipe ready to install. I used VHT Flame Proof header paint to dress it up and hopefully slow corrosion.

    Installing two REAR EFI manifolds on the 240, and staying inside the doghouse Finish10
    jdlaugh
    jdlaugh


    Number of posts : 298
    Location : Tulsa, OK
    Registration date : 2013-03-18

    Installing two REAR EFI manifolds on the 240, and staying inside the doghouse Empty Re: Installing two REAR EFI manifolds on the 240, and staying inside the doghouse

    Post by jdlaugh Tue Jan 09, 2018 11:54 am


    Installing two REAR EFI manifolds on the 240, and staying inside the doghouse Manifo10

    Installing two REAR EFI manifolds on the 240, and staying inside the doghouse Manifo11
    jrdunn96
    jrdunn96


    Number of posts : 691
    Location : Cashion, OK
    Age : 62
    Registration date : 2016-01-01

    Installing two REAR EFI manifolds on the 240, and staying inside the doghouse Empty Re: Installing two REAR EFI manifolds on the 240, and staying inside the doghouse

    Post by jrdunn96 Tue Jan 09, 2018 4:58 pm

    JD,
    You do nice work!

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    Installing two REAR EFI manifolds on the 240, and staying inside the doghouse Empty Re: Installing two REAR EFI manifolds on the 240, and staying inside the doghouse

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