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  1. #1
    Member GreenZJ's Avatar
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    M1 2bbl vs. M1 4bbl vs. Hughes Airgap

    Which is better. Why?
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    Member JGC403's Avatar
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    Differences: The Hughes is a dual plane. The injectors are at a different angle. Floor of plenum on the the Hughes has ribbing.
    No replacement for displacement!

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  3. #3
    Member GreenZJ's Avatar
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    Quote Originally Posted by JGC403 View Post
    Differences: The Hughes is a dual plane. The injectors are at a different angle. Floor of plenum on the the Hughes has ribbing.
    What does dual plane mean? Which is better? Or is it more of a, depends what application you need it for, type thing?
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  4. #4
    Member JGC403's Avatar
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    The M1 is a single plane intake, all the cylinders draw air from on plenum. A dual plane, the plenum is split in half half the cylinders draw from one plenum and the rest the other. The intake runners are a little longer in the dual plane. With carbs the dual plane was for more low end torque than the single plane.

    Mopar M1 Single plane:


    Edelbrock/ Hughes Dual plane:
    Last edited by JGC403; 03-30-2010 at 08:25 AM.
    No replacement for displacement!

    1995 Jeep Grand Cherokee Laredo ZJ
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  5. #5
    Member GreenZJ's Avatar
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    Quote Originally Posted by JGC403 View Post
    The M1 is a single plane intake, all the cylinders draw air from on plenum. A dual plane, the plenum is split in half half the cylinders draw from one plenum and the rest the other. The intake runners are a little longer in the dual plane. With carbs the dual plane was for more low end torque than the single plane.

    Single plane:


    Dual plane:
    Well that was easy. So which do you think is better between the two?
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  6. #6
    Member JGC403's Avatar
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    I have the Hughes on my 403. It will depend on the cam also. You want to match the cam to your intake and head combo.

    Mopar says the operating rpm is 2,000-6,000

    The Hughes is 1,500-6,500
    No replacement for displacement!

    1995 Jeep Grand Cherokee Laredo ZJ
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    3" Skyjacker lift
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  7. #7
    Member GreenZJ's Avatar
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    I will be going with the KRC 210X cam. Looking at their website, it looks like either setup will work. So Im still stuck at which would be better for my use. Lol

    KRC 210x camshaft

    210/220 512/512 110

    2600-5500 operating with stock valve springs.

    This cam is worth 50-60 horsepower and about 70ft/lbs when coupled with the SCT Tuner.
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  8. #8
    Member NoTime's Avatar
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    I went with the Hughes as well on my 408 build...........
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  9. #9
    Ross is gay
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    Air gap.
    - John
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  10. #10
    Banned SERB Z06's Avatar
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    I have the Air Gap and if I had to do it again, I would buy the M1.

    But if I was leaving stock heads I wouldn't waste my money on either intake.

  11. #11
    Administrator Ninergrad's Avatar
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    Quote Originally Posted by SERB Z06 View Post
    I have the Air Gap and if I had to do it again, I would buy the M1.

    But if I was leaving stock heads I wouldn't waste my money on either intake.
    +1 for stock heads.

    Why don't you like air gap? According to hughes it's a cats mew?
    -Davit.

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  12. #12
    Member GreenZJ's Avatar
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    Apparently he had fitment issues, and didnt net any gains on the dyno
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  13. #13
    yumi meowMix BuckeyeRideR's Avatar
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    whichevers cheaper ---> m1 WIN
    Captain Nate

  14. #14
    Administrator Ninergrad's Avatar
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    Huh. Weird. I wonder if they're somehow more noticeable on built engines.
    408s and 402s and 426s and what not.
    -Davit.

    98 ZJ 5.9L Slate
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  15. #15
    Last Shadow RINGWRAITH's Avatar
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    Quote Originally Posted by JGC403 View Post
    The M1 is a single plane intake, all the cylinders draw air from on plenum. A dual plane, the plenum is split in half half the cylinders draw from one plenum and the rest the other. The intake runners are a little longer in the dual plane. With carbs the dual plane was for more low end torque than the single plane.

    Mopar M1 Single plane:


    Edelbrock/ Hughes Dual plane:
    Quote Originally Posted by GreenZJ View Post
    Well that was easy. So which do you think is better between the two?
    Quote Originally Posted by GreenZJ View Post
    Apparently he had fitment issues, and didnt net any gains on the dyno




    is that so.......post the base line first, then post the one after the air gap was installed...same with the time slips!



    Nice LA intakes^
    Last edited by RINGWRAITH; 03-30-2010 at 02:30 PM.
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  16. #16
    Member grand enigma's Avatar
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    I spent some time last evening reading about this exact topic on a few Dodge sites and the consensus seems to be that either is a waste on a stock to mildly built engine. The Hughes is said to give a little more low RPM power where as you do not see the benefits of the M1 until the upper RPM range. One person noted that the Hughes give you more part-throttle power and the M1 doesn't kick in until WOT. That being said I am torn as to which would be better if either. I even read one comment where I guy went back to a ported-kegger after feeling a loss of low end power with the M1.

  17. #17
    Last Shadow RINGWRAITH's Avatar
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    Quote Originally Posted by grand enigma View Post
    I spent some time last evening reading about this exact topic on a few Dodge sites and the consensus seems to be that either is a waste on a stock to mildly built engine. The Hughes is said to give a little more low RPM power where as you do not see the benefits of the M1 until the upper RPM range. One person noted that the Hughes give you more part-throttle power and the M1 doesn't kick in until WOT. That being said I am torn as to which would be better if either. I even read one comment where I guy went back to a ported-kegger after feeling a loss of low end power with the M1.
    depends on your set up........I have boost as soon as I hit the throttle...with a stall.....and gears.......come to think of it, watt "low end" you'all speak of????????
    Captain of the Nine

  18. #18
    Member WiCKeD's Avatar
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    Had the M1 with mild mods (FIPK, ECU, headers, exhaust) and it really took off on the high end (60+ IIRC - check JU). Made the entire power band more smooth. It's definitely worth it, if you like to boogie up top. Would still have it, if it would pass smog.
    '98 Jeep Grand Cherokee 5.9er
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  19. #19
    Ross is gay
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    Quote Originally Posted by Ninergrad View Post
    Huh. Weird. I wonder if they're somehow more noticeable on built engines.
    408s and 402s and 426s and what not.
    they are. From what iv heard, if your engine is relatively stock, adding an m1 or hughes air gap can actually lower hp/tq
    - John
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  20. #20
    Banned Wrinklechops's Avatar
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    I made more power on my bone stock kegger than Milan (Serb Z06) did with his cat's meow Hughes Could be those stock heads though as was pointed out. Without spending $2000 on aftermarket heads, spending $600 on the Hughes manifold was probably a waste.

    I'm sure the Hughes makes some power somewhere. I mean, with the right setup i.e. heads, cam, etc. But also, the Hughes manifold was a bit perplexing to install. They don't have a place to put an IAT sensor whereas the M1 does. All the little crazy brackets that come with the Hughes to make it fit seem a little excessive whereas the M1 is much more simple and direct it seems. Had to grind off stuff on the TB just to get the Hughes to fit. Also, the Hughes came with cardboard joke gaskets. We scratched our heads on that one for a minute.

  21. #21
    Member GreenZJ's Avatar
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    I bought an M1, from the fitment issues SERB had, to what I read online on different fdorums, the M1 seems better for me.
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  22. #22
    Banned Wrinklechops's Avatar
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    Quote Originally Posted by GreenZJ View Post
    I bought an M1, from the fitment issues SERB had, to what I read online on different fdorums, the M1 seems better for me.
    What price did you end up with? Sometimes the M1 is lower than the Hughes, sometimes not. Where did you get it? I'm interested in picking one up here soon too.

  23. #23
    Member GreenZJ's Avatar
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    Quote Originally Posted by Wrinklechops View Post
    What price did you end up with? Sometimes the M1 is lower than the Hughes, sometimes not. Where did you get it? I'm interested in picking one up here soon too.
    I got it from kolak. Price with install kit and everything else I need came out to around 600
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  24. #24
    Banned Wrinklechops's Avatar
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    Quote Originally Posted by GreenZJ View Post
    I got it from kolak. Price with install kit and everything else I need came out to around 600
    Good deal. Guess the price is about the same as the Hughes. For some reason I thought I saw it for much cheaper...but I think I was looking at the carb intake manifolds instead of the fuel injected ones.

  25. #25
    yumi meowMix BuckeyeRideR's Avatar
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    m1 is about half of the airgap
    Captain Nate

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