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24v DOHC V6...

Discussion in '2005-2010 V6 Mustang Tech' started by WYLDHorses, Feb 22, 2005.

  1. 03f1504x4

    03f1504x4 New Member

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    Imagine all of those pissed off 99 and 01 cobra owners...If only they had read this first. :thumbup: Just busting your balls man.

    They use smaller cams, long runners and tumble port heads to solve the low engine speed velocity problem.

    Corey
     
  2. KTBug

    KTBug - Kris -

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    http://web.archive.org/web/20010717044655/motortecmag.com/archives/2001/feb/FEB01-05/FEB010503.html

     
  3. 6gofast

    6gofast New Member

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    IMO, it would be an interesting experiment, however, one should flow test both sets of heads and port the cosworth heads. Also, a custom set of cams would have to be ground for the heads/displacement.
     
  4. SpeedKills

    SpeedKills New Member

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    Bust my balls all you want, Corey, all cobras with 4v engines have IMRCs, so the expanation above doesn't apply to them. When ever ford uses a DOHC set up they put in IMRC, otherwise the engine would not be drivable.
     
  5. 03f1504x4

    03f1504x4 New Member

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    Wrong..the 99 and 01's dont have IMRC's I used to own one. )3 and 04's dont either..i didnt mention those due to the blower...the 03 and 04 mach ones did have them
     
  6. SpeedKills

    SpeedKills New Member

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    I don;t disagree with you, yes, a 4v set up will get more mass air flow and thus more horsepower, but at higher rpms. But without IMRC or VVTIL cars won't be very nice to drive on the street.
     
  7. KTBug

    KTBug - Kris -

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    The '99-00 V6s don't have IMRCs.
     
  8. 03f1504x4

    03f1504x4 New Member

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    99 and 00 v6's are pushrod 2v's
     
  9. KTBug

    KTBug - Kris -

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    Yeah, uhhh, thanks for clearing that up! :rolleyes:

    My point was that IMRCs, or the lack thereof, doesn't make the engine more or less driveable.
     
  10. 03f1504x4

    03f1504x4 New Member

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    He was saying that with DOHC ford puts IMRC's


    "When ever ford uses a DOHC set up they put in IMRC, otherwise the engine would not be drivable."
     
  11. KTBug

    KTBug - Kris -

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    Yes, but.........


     
  12. 03f1504x4

    03f1504x4 New Member

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    LOL...im dropping it..
     
  13. KTBug

    KTBug - Kris -

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    :lol: Sorry, I think I caused the confusion! :lol:
     
  14. SpeedKills

    SpeedKills New Member

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    we are not talking about 2V engines, ford just added the IMRC to boost torque on the 01-04 v6s. Also all 4.2L F150 have IMRC because they need more lowend TQ.

    Yes, I checked 99 and 01 don't have imrcs. Bizzare. Ford must have done something with the intake system on 99 and 01. I may have exagerated a bit BUT, Cobras have full torque at 4750rpm and GTs at only 4000rpm. Where as Mach 1s w/ IMRCs have full TQ available at 4200rpm.

    As you can see full TQ is available much higher making the car not "torquy"
     
  15. 03f1504x4

    03f1504x4 New Member

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    it was the "tumble ports and long runner manifold...even the 00 cobra r didt have IMRC's
     
  16. KTBug

    KTBug - Kris -

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    IMRC's do not add torque or give the engine more low end torque. Split port type intake manifolds flow through the long runners at low RPMs and the short runners at high RPMs. The IMRCs are just doors that close off the long runners at 3500 RPMs (in the case of the V6 Mustang) and allow the engine to breathe through the short runners which produces more hp. The engine would produce the same amount of torque (roughly) with or without IMRC's.
     
  17. 03f1504x4

    03f1504x4 New Member

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    IN FACT...thats the first mod on most IMRC equipped cars..is removing it. In the cobras tho..they close off the short runners below a certain rpm..(cant remember..mine didnt have them) then..above that mark..they open the large ones as well..it flows through both the long and the short runners.

    :thumbup: KTBug
     
  18. KTBug

    KTBug - Kris -

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    Yeah, I said that backwards. The IMRC's are in the short runners and open up at 3500 RPMs. They don't influence low end torque much at all.
     

    Attached Files:

  19. 6gofast

    6gofast New Member

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    Ah, so thats what they look like. My car doesn't have them, I always wondered what they looked like.
     
  20. KTBug

    KTBug - Kris -

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    Looks just like the throttle body!