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  1. #1

    Default Tri Power Turbo ? On stock 302 without EEC

    Okay, I realize I may be insane for even suggesting such a thing BUT I have the following available to me

    T4/T5 Turbo
    Shorty Headers
    3 x Holley 5200 Carbs
    Malpassi Fuel Pressure Regulator

    Am I crazy to think that I could tri power Turbo charge my stock 302 ?

    Is tri power feasible on a v8 ?

    I have a rear facing scoop... it wouldn't be impossible for me to cut a hole in the hood , build an airbox with a TMIC connected to the tri power..

    I could use this intake manifold here
    http://www.cobranda.com/3x2alinma.html

    Please tell me I'm insane.
    1981 Mustang Hatch 3.3 "Orange Juice"
    1983 Mustang GT Convertible "Triple Black"
    1994 Ford ThunderBird SC
    1987 Firebird T/A
    1984 Firebird Forumla
    1988 Mazda RX-7 Infinity
    1987 Mazda RX-7 Turbo II
    1994 Eagle Talon TSI
    1991 Eagle Talon TSI
    2003 Pontiac Grand Prix GTP

  2. #2
    FEP Super Member mustangxtreme's Avatar
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    I'll bite. You're insane. 5200 Holleys are a progressive 2bbl which isn't what you would need for that manifold. If you are going for inexpensive carbs you may be able to make a Motorcraft 2100/2150 work with some modifications.
    Dave

    If common sense was common wouldn't it just be sense?

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  3. #3

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    Haha , Thanks for being honest. The carb isn't the best choice I'll give you that, I just so happen to have 3 of them lying around and I'm a mad scientist when It comes to cars.
    1981 Mustang Hatch 3.3 "Orange Juice"
    1983 Mustang GT Convertible "Triple Black"
    1994 Ford ThunderBird SC
    1987 Firebird T/A
    1984 Firebird Forumla
    1988 Mazda RX-7 Infinity
    1987 Mazda RX-7 Turbo II
    1994 Eagle Talon TSI
    1991 Eagle Talon TSI
    2003 Pontiac Grand Prix GTP

  4. #4
    FEP Senior Member droopie85gt's Avatar
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    It would be miles easier just using a single 4bbl blow thru carb.
    1985 GT, Sunroof, 5 Lug, Rear Discs, 01 Graphite Bullets, 88 forged piston shortblock, 2.02/1.60 Alum heads, Weiand Stealth, Holley C950 TBI, BBK Long tubes

  5. #5

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    State of sanity aside, the as-is snouts on those carbs (and I think their bolt pattern) won't allow bolting down together onto such a six-pack intake, without some sort of lengthwise adapter to spread them out front-to-rear... which would then likely get the front carb into the distributor's area... etc...

    Not crazy, totally feasible, totally unique, and could be very tractable and powerful... with three 2300 Holley's, or Autolite/Motorcraft 2100/2150's. The turbocharged stuffed-in airflow race would be on!

    600+ for that six-pack intake manifold would easily buy a 4-bbl intake manifold, a carburetor, and the few carburetor modifications necessary for blow-thru.
    Mike
    1986 Mustang convertible ---> BUILD THREAD
    1983 Mercury Cougar LS
    1986 Ford Thunderbird ELAN
    1966 Ford Fairlane sedan
    1966 Ford Fairlane GT
    1981 Mercury Marquis Brougham
    1980 Capri RS Turbo
    1971 Mustang
    1974 Pontiac LeMans

  6. #6

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    Well I have an exhaust leak on my pass side... so that means I get to take the exhaust off. So the shortys are going on one way or another, any recommendations on a blow thru carb ? The intake I will have to decide on between Dual 4's or Triple 2's . I think the work on tri power would be a lot more, so I might just go with dual 4's.

    I just really love saying Tri Power though, it's so appealing.

    Aside from the obvious additional CFM, would a 2 x 4 carb setup just run one as the main and one as the secondary, or would it use the mains of both as the main etc

    I have all the stuff I need aside from exhaust piping (which is cheap) and there is a perfect triangle hole on the bottom side of the hood that is right on top of the air cleaner.
    Name:  Triangle.jpg
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    1981 Mustang Hatch 3.3 "Orange Juice"
    1983 Mustang GT Convertible "Triple Black"
    1994 Ford ThunderBird SC
    1987 Firebird T/A
    1984 Firebird Forumla
    1988 Mazda RX-7 Infinity
    1987 Mazda RX-7 Turbo II
    1994 Eagle Talon TSI
    1991 Eagle Talon TSI
    2003 Pontiac Grand Prix GTP

  7. #7
    FEP Power Member xctasy's Avatar
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    i have to be carefull to answer your questions.


    Before I do, I would personally Zero off some cost, and get a much better result.

    Grab a used GT40 lower intake, and buy an extra 5200 carb.



    place four in line 5200's on it with two left, two right. A KC12 linkage allows them to be all linked together, mechanical secondary. The blueprinted flow rate of the 26/27 venturi 5200 Holley Weber has been measured at exactly 227 cfm at 1.5"Hg. Time 4, that is 908 cfm . Just like two 465 cfm 4-bbl mec secondaries. There were downgraded 23 mm venturi primary 5200 carbs for later 1980-1982 2.3's, and they flow less. So do the Chevy Chevette carbs. The 74-79 26 mm primary 5200 carbs are the ones to get.

    Under each carb you have a trouser link front to back so one 27 mm barrel goes to the center, the other 23 or 26 mm venturi, to the center. Under wide open throttle. Both throotles tip in toward a common center point.

    You just grab a hunk of 1-1/4" 32 mm alloy tooling plate used for presses, and cut and drill and trough in the the lower intake, then add a 1/2" upper plat which you mount your carbs to.

    The 5200 has to tuned like the four corner idle on the 4180c, and you use the same 5200 jets and idle correctors and power valves and float settings. For linkage control, well Webers linkage is crazy good.

    You don't go over 12 psi boost, and you'll be fine.


    Grab one after market linkage

    JEEP CJ7 Wrangler Cherokee 4.2 Redline Linkage kit for WEBER DGV, DGEV, or DGAV


    Bill's k12 38 weber 2bbl rod operated accelerator linkage for his 38 DGAS is here








    WEBER DGV/DGAV TWIN CARBURETTOR/CARB THROTTLE SYNCHRONISING LINKAGE KIT

    Start jetting is the same as the stock Chervelot Chevette.

    Its in the Holley book by SA bookes.

    You use the stock Ford throttle linkage, centered between the carbs, and link the left and right bank.

    You'll have to create a handed version of the after market "THROTTLE SYNCHRONISING LINKAGE KIT"

    I'd go to a jeweler and ask him to make four knock off 32/36 linkages in mirror image form for your 5200's.


    The easiest way to do it would be to have 32/36's on the paasenger bank, and 5200's on the drivers side, and lik them.


    With an average of eight 26.5 mm venturis, peak power would be at a very low figure, and it would provide an imense amount of low speed torque.



    Now, if you wanna go triples with a 600 dollar intake, then you run the middle carb as a simultanous 5200 coversion by scratch building a mirror image throttle conversion to the 32/36 system above.

    Add a half inch plate, undivided to the base, a standard Holley 2300/Autolite 2100/Motorcraft 2150 series to 32/36 daptor, but opened up so the differential size throttles are able to open, and tip into towards the engine center line. HW 5200's provide excellent air fuel ratio distribution compared to H 23000/A 2100/M 2150 2-bbl carbs. Having a 32 mm primary with 36 secondary and 26 and 27 mm differentially sized venturis makes no problem with air fuel distribution, as the throttles tip in towards a common center.

    You do have to put an undivided plate under them to ensure air fuel is evenly distributed through the effectively 6 bbl intake. Outer carbs , you can do whatever, but I'd peRsonally put an undivided carb spacer plate on the outer two carbs. The two outers should come in at 60% throttle, and you'd do that by using the lost motion 38DEGS spindle, used on this guys Saab 93 Twin Weber 38DGES conversion. You really need a simultaneous linkage to each carb, and lost motion to the ourts, and then it tips bothe barrels open from the 5200 Holley Webers primary barrel.

    See BassPlayerMykk's Twin 38DGES 94 Saab 95 carb conversion. Most of it is so totally poorly executed due to its inablity to run indepedent runner the way the stock injection intake used to, but its got some really nice parts and he has built it first and had a go.

    The lost motion 38DGES throttle spindel is the focus point here, and its got the right way of producing inital non movement for the two outer carbs.

    Rember, the HW 5200 is sort of a handed mirror image, non gear driven 38 DGES

    You have to transfer the idea over to the two outer 5200 HW's to ease your throttle linkage stress and set up issues.

    http://vid1230.photobucket.com/album...8_133544-1.mp4

    http://www.bangshift.com/forum/forum...-95-bmw-540i-6


    Good fortune with this. Oh, and there's a reason Ford USA never went blow through asside from the first Paxton supercharged T-birds and 57 Fords and the 67 Shelby's....if a blow trhough carb ruptures a power valve or collapses a float or has a in service fuel delivery problem, in the words of Assistant Chief Engineer for the 79 Mustang 2.3 Turbo



    Same with the blow through 1985 4-bbl Saleen PaxtonMustang conversion; should have been a shoe in for CARB emissions certification, but even the most excellent car sorters in the world had so many problems making a blow trhough carb work and be legal and safe, they avoided blow through carb instillations for years.


    Gale Banks, Austin Rover's MG Metro 1275/ MG Maestro2000 and Ford of Europes 2.8 Capri Turbo and Alfa Romeo's TurboDelta and the Lous Esprit Turbo were the best blow trhough conversions. The R5/R18/Feugo Renault Solex 1-bbl blow through carb instillations weren't very reliable because of in service fuel dlivery problems.


    My summary? Norm General from Ford was right, but if your carbs are in good shape and you havea good, robust and well sorted fuel air distribution and linkage, a brace of multiple Holley Weber 5200's will be a great blow thru carb.


    This all goes back to what I said a while ago. If you use Webers to get an inital jump on horsepower before turbo charging is added, then a low pressre, less than 12 pound boost turbo with a mechanical fuel pump and Malpasi rising rate fuel regulator will allow Weber carbs to run easily and simply. The Italians, Germans (Zakspeed 2.8 Turbo Capri) and English made blow through turbos work by simply understanding what a carb does, and by moderate boost increase, not huge ones. Getting reliable 40 to 65% power boosts with just 9 pounds of boost was because they understood how to makr the basic carbs work properly.
    Last edited by xctasy; 02-19-2017 at 03:12 PM.
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  8. #8

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    It's funny because Fuel Delivery is one thing I do understand.

    I have a Malpassi Regulator, I have the Sync Link, and I have a High Volumne Fuel Pump

    From what you are saying X this would be very similar to what I had to do on my 81 for the TRI power, I will need to get my hands on another 5200 and see what I can come up with. Although I may end up having to do it on a pulled 302 I have here, as I might have to sell my vert due to upcoming expenses (I'm getting married in June and school In sept) so I don't think I'll be doing it on the 83 GT Vert. Gives me a good idea to play around with though on my test bed
    1981 Mustang Hatch 3.3 "Orange Juice"
    1983 Mustang GT Convertible "Triple Black"
    1994 Ford ThunderBird SC
    1987 Firebird T/A
    1984 Firebird Forumla
    1988 Mazda RX-7 Infinity
    1987 Mazda RX-7 Turbo II
    1994 Eagle Talon TSI
    1991 Eagle Talon TSI
    2003 Pontiac Grand Prix GTP

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