How much power from intake swap?

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  1. moper

    moper FABO Gold Member FABO Gold Member

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    What displacement is it now?
     
  2. ratvon

    ratvon Well-Known Member

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    I had a GTX That ran 10.50's and put a tunnel ram and two fours on it, didn't gain much horsepower but it really got very consistent with running its numbers
     
  3. RAMM

    RAMM Well-Known Member

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    What are the rules concerning plenum top height and or carb spacer height? The design you have now will not work very well. You need to get that carb higher and make a much better transition into the runners. As it is now I bet your plenum volume is too small, that combined with the challenge of feeding the outer runners will result in less than the desired outcome. As some have suggested a split Dom would be your best 4 barrel. Is it legal? J.Rob
     
  4. MRL Performance

    MRL Performance Well-Known Member

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    Ok, so we finally got this 470 back on the dyno and its all done and ready to rock for this season.

    I did NOT run the Victor intake, as the flow was way under what the heads flow. So we ran the single dom carb T/R. It ran good. All we did is have the heads worked over by the LaRoy guys, gained 30+cfm at the higher lift(.650+). Compression was a bit lower from the chamber work. Same cam and bottom end. Same 1050 carb. ADD the MW T/R intake.

    Went from 731HP@6750rpm to 793HP@7300rpm

    It did exactly what we hoped it would. Raise the power and the power band.

    [ame]http://youtu.be/mPNcCWyld9w[/ame]
     
  5. MRL Performance

    MRL Performance Well-Known Member

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    [ame]https://youtu.be/InO1taN13eI[/ame]
     
  6. racerhog

    racerhog RacerHog likes his Mopars

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    Nice Job... I'm Sure he will be happy with that !!!! :)
     
  7. moper

    moper FABO Gold Member FABO Gold Member

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    JMO but I'm guessing the gain came from the heads. I don't see much of a positive on the plenum area of the TR like RAMM mentionned. Just for giggles you shoulld try raising the carb adaptor up another 2 inches if it's still on the dyno.
     
  8. hangn0ut

    hangn0ut Well-Known Member

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    Do you see the pan-evac as an improvement over breathers?
     
  9. MRL Performance

    MRL Performance Well-Known Member

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    On the track, Killer!

    [ame]https://youtu.be/HqmJzDlQaAs[/ame]

    [ame]https://youtu.be/8SJ7AnFbbPU[/ame]
     
  10. racerhog

    racerhog RacerHog likes his Mopars

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    Rolling thunder rocks !!!!
     
  11. Marcohotrod

    Marcohotrod Well-Known Member

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    tunnel rams rule on built up engines! (and the heads were tuned up) why no spinning the water pump on dyno?
     
  12. MRL Performance

    MRL Performance Well-Known Member

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    We run an electric pump to circulate the water. I don't have the time or patients to get pulleys to line up, don't have very many any way. Its just easier for me when hooking them up. It not worth much, maybe 5HP on most stuff. He is running an electric motor to run the pump, not the crank.
     
  13. MRL Performance

    MRL Performance Well-Known Member

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    YES!!! This one pulled 9in vacuum at 6500 and up. Really helps seal the rings, more power!
     
  14. IQ52

    IQ52 Well-Known Member

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    Mike is correct on the horsepower loss. When the belt flies off the crank and water pump pulleys on a 700 HP engine at 7,000 rpm you gain about 7 HP. Done watched that happen with my very own eyeballs.

    Another interesting note. A loose belt that slips and flaps around will cost more horsepower than a tight one. Tested that on our dyno.

    There is supposed to be an even greater loss when pulling a fan with the belt but I have not personally tested that one.
     
  15. mguner

    mguner How many is too many?

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    I ran a single 4 Offy tunnel ram on a couple of different mild 400 B engines with cast iron exhaust in a 71 Demon daily driver and it was great. Full range power increase. In my 452 RB Duster the tunnel ram is set up like a split dominator using a pair of modified 6425 Holleys. I switch between a six pack with 4412s on the outboard and a 280 CFM center and the tunnel ram with the two 2 barrels and gain half a second or about 50 HP with the tunnel ram. I was concerned that there might not be enough plenum area above the runners for even flow on your rig but apparently it is not an issue.
     
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