Working on DIY EFI BBC 8-71 Project...pics
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Working on DIY EFI BBC 8-71 Project...pics

  1. #1
    TJS
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    Default Working on DIY EFI BBC 8-71 Project...pics

    I decided to machine the injector pockets on my plate for my 8-71 BBC EFI Jet Boat project. I machined the blank plate a while ago with the help of a friend who has a Haas machine.
    All in all it came out great. I took my time, did some simple math and measured 3 times. I bought a 14mm injector pocket cutting tool from Ross machine. I am using 96 Lb Rochester style injectors. This took about 30 minutes or so to do (cut the holes in the plate). Next up fuel rail machining from Ross Machine fuel rail stock(about 45 minutes).

    I know some here will say why? I have always wanted to go EFI and like the looks of a Bugcatcher a top of an x-71 blower. Yes I could have built my own turbo set up with EFI and such but I want to go the blower route. I do not have too much money (less blower) into the EFI set up. Just some billet stock, fuel rail stock, and time (about 200.00). This is fun for me I must say.

    Here is a critical part if you want your project to be straight. Indicating the fixed jaw of the vice. I am only .0003 (that is 3 tenths of a thou.) out from one edge to the other.



    After Locating the edge of the part with an edgefinder I was able to use the digital readout. Here is the cutting tool ready.



    After doing some simple math I found the points to where to machine the holes for the injectors. Here is the first hole spacing. Notice the Y-Axis is 0000. This is the center of the plate. This should not move during the whole process.



    Notice the tink marks from the cutting tool in the alum. What I did was space out using the digital read out and then make sure I had my math correct.



    Here is the first hole cut.



    Checking fit up and the depth. This is critical. I had to machine, clean and check the depth a few times to where I wanted the injector to sit. I then set the Z-stop and all the other holes were all the same depth.



    A few minutes later and all the holes are done for one side.



    Flipped over the other side. Notice the angle plate acting as a "stop". This lets me keep the tool in the machine with out taking it out and finding the X and Y edges again.




    T.J.

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  3. #2
    TJS
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    More.

    Here is the plate mocked up with the injectors set in place.















  4. #3
    I'm famous ! Lucky's Avatar
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    That is sick NICE WORK
    " my carbon footprint is gonna kick your green ass"


    Quote Originally Posted by 396_Ways_To_Spit View Post
    WOWO!!!!! THat has to be the most beautiful crank that Ive ever seen!!!!!!!!!!!!!!!!


    Quote Originally Posted by MAXIMUS View Post
    He has been allowing me to park my equipment in his backyard for a few years now...
    [/SIGPIC]

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  6. #4
    TJS
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    Default Fuel Rail Stock Machining

    Ok today I machined the fuel rails matching the numbers on the digital readout from yesterday's injector plate machining. Rails are -10AN from Ross Machine. I have to devise a way to hold the rails to injector plate. Some sort of bracket. I might use Ross machine mounts for this.

    Here we go. Cutting the fuel rails for the length I think they are going to be. I have never done this before and I am learning as I am going.



    Even though my saw blade is damn near square to the saw vice I always square my materail in the Bridgeport. It just makes it easier in the long run. This also allowed me to get the rails exactly the same length. I also calculated for some "hang-over"



    Another critical point to mention. The rails are round so they want to move around in the vice. You can see some square key stock I cut to hold them close to square. I finished up indicating the rails to the spindle both X and Y.



    The Ross Machine tool is well worth the money. I set the depth and machined away.



    Here they are all done except for the threaded ends. I need to mock up first to see if I need any trimming. Sweet huh.



    Mocking up. Damn this is cool.



    Sorry for the poor pic. I don't know what happened.



    Yup, interference as I thought. The throttle position sensor hits. I marked it and will trim it. Good thing I left some hang-over. Once I get the length to where I want I will machine them for -10AN O-ring with the O-ring boss tool from MSC$$.

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    not ****** little squirt's Avatar
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    All i can say is wow thats some sweeeeet hardware right there!!!! and tools!
    not banned

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    DJD
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    Very very cool looks like a ton of work but it also looks like a ton of fun doing it also. Keep the pics comin on this deal so we can follow. I love the looks of a hat. Heres mine but its mechanical.

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    wow, looks great!

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    21 Daytona Outlaw's Avatar
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    Nice work, what ECM are you going to use?

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    TJS
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    Quote Originally Posted by Outlaw View Post
    Nice work, what ECM are you going to use?
    I have not commited yet. I am looking at FAST or Accel's new Thruster.
    Thanks.
    T.J.

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    Senior Member superdave013's Avatar
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    Looks nice. Those center bolt holes are not used with the injecter hat right? I left them and the center rib out when I did a nitrous spacer plate.
    Dang right those O ring boss porting tools are $$$$$. But they ream the hole for the tap, cut the o ring groove, cut the chamfer and face the end all in one shot.

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    TJS
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    Quote Originally Posted by superdave013 View Post
    Looks nice. Those center bolt holes are not used with the injecter hat right? I left them and the center rib out when I did a nitrous spacer plate.
    Dang right those O ring boss porting tools are $$$$$. But they ream the hole for the tap, cut the o ring groove, cut the chamfer and face the end all in one shot.
    Dave, the center bolts are not used to hold the hat. They are counterbored in the plate to hold the plate though. I practiced with the O-ring boss porting tool I got at MSC. It does a real nice job. It should right $$. Next up I will be doing this to the ends of the rails after I mock up for the fittings cause the rails need a little trimming.
    Here is a pic of the practice. Sorry camera phone.
    T.J.

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    Senior Member superdave013's Avatar
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    hey PM me your address. I want to send you a few things.

    man, that fuel rail is 12 bucks per foot. ouch! I would love to find out who has the die so I could buy per pound instead.

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    Looking good T.J. Are going to run that set-up this season?
    http://www.hotboat.com/image_center/data/520/medium/23441W1W.jpg

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    TJS
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    Quote Originally Posted by blown468 View Post
    Looking good T.J. Are going to run that set-up this season?
    I am not sure. I really don't want to take the boat out of use in the prime of season to do the change over and dyno it. I may wait till late in the season and try for Oct or something.
    Thanks.
    T.J.

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