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The Silver Buick's 1969 Firebird OHC six project.

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  • Despite the car being snow covered in the morning, I decided to play with some of the cold side plumbing because the registration high, lol. I think I have where the intercooler can sit. The right side will need a 3.5" hole cut in the core support, but a 90º fitting off the intercooler shouldn't intersect anything and will be a matter of getting the plumbing to where the throttlebody lands. Expecting to get the head and intake on Friday! Yay!

    The cold side going under the core support.


    The airfilter is just a place holder keeping debris out of the inlet until I know what I'm actually doing for the intake.


    Going from ~22gpm to 55gpm, and from a 3 row brass to 2-row aluminum should significantly improve the cooling system. Though the only real cooling issue I ever had was hitting the pump flow limit at highway speeds above 90ºF, and simply slowing down cooled the engine off every time.



    As a side note, I'm contemplating building a low budget 230 or high compression 250. A set of cast pistons are $100 at summit, I have a set of checked out good rods. Just get the bores and deck cleaned up, and the crank cleaned up if it needs it. Kind of practice for getting the good engine together since it's been awhile? And have a back up engine ready to go if necessary. I don't know, maybe, maybe not.

    Escaped on a technicality.

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    • Do you run a thermostat?
      If not, get one and cut the guts out and install it..
      Derby motors get hot fast without something in the thermostat opening..actually run cooler.

      If you run a thermostat, disreard my advice..

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      • No thermostat. Cannot run one in the configuration its in. There is no bypass. It didn't have any cooling problems outside of being water pump flow limited. It simply turned the pump on at 190ºF and off at 180ºF and worked fine. But with the new big pump I'm going to give a go at running the electric motor slowly when cold and just speed up as needed to hover in the 180ºF range. I don't want it running at 140ºF or less, which it will at full pump speed.
        Escaped on a technicality.

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        • Intake and head showed up today! I was surprised to find the intake weighs a bit more than my sheet metal one, but I don't have to worry about it leaking or cracking!

          Three tubes on my "backup" headers unfortunately hit the intake. Wouldn't take much to clearance them but I'm going to keep them on the shelf for now. I've decided to start on a new set of headers though using 1.75" primary tubes instead of the 1.5" of my currently half finished set. I have a box full of 1.75" U-bend pipe.





          Escaped on a technicality.

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          • I got the lower mounts for the intercooler and radiator welded on, just need some strap metal for the top. I was pretty happy to see how little I needed to trim off the hood latch support to clear the intercooler.




            Last edited by TheSilverBuick; March 16, 2018, 09:48 AM.
            Escaped on a technicality.

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            • Everyone likes a good mock up. The real trouble with EFI'ing the OHC engine is that #1 cylinder fuel injector wants to occupy the same space as the thermostat housing. I have that issue with both intakes I made and this one is no different. The only alternative is to really lay the injector over and there isn't enough material in this intake to do that. I really wanted to figure out where the throttle body would land so I can continue planning the air routing after the intercooler. Lands about 4" off the radiator, so I'll need a 90º off the throttle body, but that isn't much different than my custom intake, just a bit closer to the engine.







              Very similar to this, just a few inches closer to the engine and clear of the radiator hose.


              Also pulled the head off the engine that looks rebuilt. It's a bit carboned up but the bores appear to still show hone marks and none of them have rust where the rings sweep by. The oil makes me wonder what the source of the carbon is. If the rings didn't seat, stuck PCV valve or just poor combustion due to fuel/spark issues? It is a 250 head on a 230 short block so the compression ratio is like 7.8:1, so could easliy be poor combustion causing it. I wonder if my '66 230 head is salvagable or if my test/practice porting has rendered it unusable?


              L2258 pistons. Same ones Egge sells.
              Escaped on a technicality.

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              • Originally posted by TheSilverBuick View Post
                Everyone likes a good mock up. The real trouble with EFI'ing the OHC engine is that #1 cylinder fuel injector wants to occupy the same space as the thermostat housing. I have that issue with both intakes I made and this one is no different. The only alternative is to really lay the injector over and there isn't enough material in this intake to do that. I really wanted to figure out where the throttle body would land so I can continue planning the air routing after the intercooler. Lands about 4" off the radiator, so I'll need a 90º off the throttle body, but that isn't much different than my custom intake, just a bit closer to the engine.


                An offset water outlet would resolve this issue... http://www.jegs.com/i/Weiand/925/90845/10002/-1



                I know Mr Burns likes to fab stuff, and he surely won't pay $187 for a part that may or may not fit..
                This should give you an idea of what to do. I suspect you'll be busting out the welder and fabbing one in no time...

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                • Haha, that is pretty neat though!
                  Escaped on a technicality.

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                  • Click image for larger version

Name:	waterneckoffset_sm.jpg
Views:	345
Size:	8.6 KB
ID:	1194018Thermostat Housing / Water Neck, 1" Offset Billet Aluminum $135
                    Patrick & Tammy
                    - Long Haulin' 2008, 2009, 2010, 2011, 2012, 2014...Addicting isn't it...??

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                    • Izuzu or one of the like small trucks have a in hose type thermostat housing..
                      Wouldn't do you much good as you basically need a fancy nipple
                      Seeing how you said above that you do not run a thermostat..

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                      • I'm sure Nick could whittle an offset out of aluminum for you!
                        Life is short. Be a do'er and not a shoulda done'er.
                        1969 Galaxie 500 https://bangshift.com/forum/forum/ba...ild-it-s-alive
                        1998 Mustang GT https://bangshift.com/forum/forum/ba...60-and-a-turbo
                        1983 Mustang GT 545/552/302/Turbo302/552 http://www.bangshift.com/forum/forum...485-bbr-s-83gt
                        1973 F-250 BBF Turbo Truck http://www.bangshift.com/forum/forum...uck-conversion
                        1986 Ford Ranger EFI 545/C6 https://bangshift.com/forum/forum/ba...tooth-and-nail

                        Comment


                        • Do some real fancy plumbing to keep my reverse flow cooling system. There is certainly room for an offset, the interference is like a 1/2" or so, and honestly a decent welder could probably just notch a stock housing as the simplest solution.

                          With the stock intake, the challenge was clearing the throttle body with a straight rail, because laying over the rail enough to clear the housing would cause it to intersect the throttle body. I experimented with two ways to get around this, and ran into trouble with the lines leaking, and the other way was injector caps, but didn't have the right kind of hose between the caps.


                          My home made intake had the injectors layed over enough to clear a stock thermostat housing.


                          With the intake Nick worked on, he probably could have layed over the injector a bit more, but he wasn't aware of the thermostat housing issue, nor was I particularly concerned about it. This is were a simple notching of a stock housing would probably work. If I get a second intake I'll take more care to have it layed over some more.
                          Escaped on a technicality.

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                          • Need one like this one for a 460.

                            Life is short. Be a do'er and not a shoulda done'er.
                            1969 Galaxie 500 https://bangshift.com/forum/forum/ba...ild-it-s-alive
                            1998 Mustang GT https://bangshift.com/forum/forum/ba...60-and-a-turbo
                            1983 Mustang GT 545/552/302/Turbo302/552 http://www.bangshift.com/forum/forum...485-bbr-s-83gt
                            1973 F-250 BBF Turbo Truck http://www.bangshift.com/forum/forum...uck-conversion
                            1986 Ford Ranger EFI 545/C6 https://bangshift.com/forum/forum/ba...tooth-and-nail

                            Comment


                            • Unfortunately not as much progress in the last month as I'd hoped to have. A combination of bad weather on the weekends and other priorities coming up. I did bend some aluminum strap metal for the upper intercooler support. I need to get some matching bolts to the core support, but otherwise it is finished. I also hole-sawed the core support and ran the cold side plumbing through it. I need one more 90º coupler and then to trim down one of the pipes to get it in the right spot for the new intake. Boy does it tempt me to get a carb hat on it and hook up the turbo to this engine, lol!

                              I need to figure out where to fit the Mezier water pump and then I can go back to at least driving the car. It's a monster of a unit compared to the small Craigs-Davies unit I had been using, and the hot side plumbing to the turbo plus 4" exhaust are now occupying the space the water pump once did. I think I'm really going to be putting the "remote" into remote water pump.

                              I need to get some new header flanges cut to start on the bigger header tubes, that actually clear the new intake manifold, but this can be done outside the car.



                              Escaped on a technicality.

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                              • Like this project a lot!

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