News

Stratos induction system on 246GT

Discussion in '206/246' started by Pantdino, Aug 28, 2005.

  1. Dino Club Germany

    Dino Club Germany Formula Junior

    Nov 10, 2008
    527
    Germany
    Full Name:
    N. Schumacher
    These pictures are very interesting for me.
    Not the manifold itself, but the diameter to the carbs and to the cylinder heads!
    The upper diameter fits obviously to the bigger carbs with 44 or 48mm,
    but the lower diameter looks as the original size of the intake port of a serial
    Dino cylinder head. I have done the same with my Dino 246 intake manifold
    to match it to DCNF 44 carbs without modifying my cylinder heads (and hood).
    Some people called it stupid, but I think it makes sense as the decreasing
    diameter supports the gas acceleration into the engine.
    This pictures proves my idea :)
     
  2. michael bayer

    michael bayer Formula 3

    Aug 4, 2004
    1,292
    Back to earlier in the discussion on horsepower gains The stratos modified engines output is all the more impressive as the as built horsepower claimed by Enzo for the Fiat built 2.0 and 2.4 engines was significantly off the mark, where as the Fiat claimed outputs for the 2.0 and 2.4 are much closer to reality Also did not the Stratos have a 2 spark plug heads?
     
  3. Dino Club Germany

    Dino Club Germany Formula Junior

    Nov 10, 2008
    527
    Germany
    Full Name:
    N. Schumacher
    No, they don´t.
    2 Spark Heads were only on the 206 Race Engines.
    The Stratos engines had 4 Valve heads and at the end of the development
    there were some turbo charged with 2 valves.
     
  4. michael bayer

    michael bayer Formula 3

    Aug 4, 2004
    1,292
    Thanks for that clarification
     
  5. swift53

    swift53 F1 Rookie
    Rossa Subscribed

    Nov 17, 2007
    4,484
    E.S.
    Full Name:
    Alberto
    Nico, the base of the 44's is not the same as the stock Dino 40's.
    How did you modify the stock manifold to make them fit?
    Do you find a performance improvement?

    Regards, Alberto
     
  6. abstamaria

    abstamaria F1 Rookie
    Silver Subscribed

    Feb 11, 2006
    2,599
    Full Name:
    Andres
    I almost missed this discussion. The most interesting fora here are this (vintage) forum and of course the Dino forum.

    Andres
     
  7. Peter

    Peter F1 Veteran
    Rossa Subscribed Owner

    Dec 21, 2000
    6,386
    B.C., Canada
    Who sells them in Italy? Berni Motori? Guiseppe Volta?...
     
  8. stratos

    stratos Formula Junior

    Dec 9, 2003
    637
    Switzerland
    #33 stratos, Aug 1, 2011
    Last edited: Aug 1, 2011
    The manifold is reworked and enlarged/gasflowed at both ends and inside, so are the heads. To fit 48s you need to enlarge it to the limit of its structural integrity as compared to the Stradale Stratos. The usual Stratos parts sources in Italy can provide rough re-cast inlet manifolds that you need to rework completely in order to fit.
    Only works cars used 4V engines with no more success than 2V ones, these produce slightly more power at the expense of low end torque (undesirable in rallying) and fragility. The 4V engines use a completely different inlet system.
     
  9. Dino Club Germany

    Dino Club Germany Formula Junior

    Nov 10, 2008
    527
    Germany
    Full Name:
    N. Schumacher
    #34 Dino Club Germany, Aug 2, 2011
    Last edited: Aug 2, 2011
    Alberto, they are the same.
    I compared Weber DCNF 40 with 42 and 44:
    no difference in the outer flange to the inlet manifold.
    The DCNF 42 are used on amost all older Maseratis and relatively easy to find.
    I thought 2 mm more would not make a big difference and looked for the rare
    44 DCNF. My inlet manifold was modified to the 44mm ID for the DCNF
    and was not modified to the 40 mm ID on the cylinder head.
    For me the same was done with the Stratos inlet maifold, but with 48
    and inserts in the cylinder heads.

    [​IMG]

    [​IMG]
     
  10. swift53

    swift53 F1 Rookie
    Rossa Subscribed

    Nov 17, 2007
    4,484
    E.S.
    Full Name:
    Alberto
    Nico, look at post #21. That is a Stratos manifold for IDF's.
    Dino manifold is different, and of course you can fit larger DCNF.
    Did you gain power?
    Regards, Alberto
     
  11. Motob

    Motob Formula 3
    Professional Ferrari Technician

    Nov 11, 2003
    2,029
    Berkeley, CA
    Full Name:
    Brian Brown
    A lot of work and some very rare parts to make the car run better. Our machinist did it the easy way. He just put a Motec fuel injection system on his 246GTS: no new intake manifold required, no bodywork required, no jetting required. Just some Weber replacement throttle bodies and the injection system. He also tailored the ignition curve and fuel mapping to the the engine modifications that he made.

    Much easier and probably performs better as well.
     
  12. rosso corsa motorsport

    rosso corsa motorsport Formula Junior

    Nov 30, 2008
    268
    #37 rosso corsa motorsport, Aug 12, 2011
    Last edited by a moderator: Sep 7, 2017
    why change engine lid!!!!!!!
    this car have original 44 IDF carbs with stratos manifold. no modification made to engine lid
    original 44 IDF is almost impossible to find today, replicas is no problem
    Image Unavailable, Please Login
     
  13. swift53

    swift53 F1 Rookie
    Rossa Subscribed

    Nov 17, 2007
    4,484
    E.S.
    Full Name:
    Alberto
    With, or without the airbox?

    Regards, Alberto
     
  14. rosso corsa motorsport

    rosso corsa motorsport Formula Junior

    Nov 30, 2008
    268
    with airbox
     
  15. racerboy9

    racerboy9 Formula 3
    Silver Subscribed

    Nov 3, 2003
    1,828
    Love to see the inside shot of this engine bay.
     
  16. swift53

    swift53 F1 Rookie
    Rossa Subscribed

    Nov 17, 2007
    4,484
    E.S.
    Full Name:
    Alberto
    Me too...
     
  17. rosso corsa motorsport

    rosso corsa motorsport Formula Junior

    Nov 30, 2008
    268
    sorry dont have that now, can get when i have the car in for service soon
     
  18. rosso corsa motorsport

    rosso corsa motorsport Formula Junior

    Nov 30, 2008
    268
    if anyone wants to have, I can have them fitted
     
  19. swift53

    swift53 F1 Rookie
    Rossa Subscribed

    Nov 17, 2007
    4,484
    E.S.
    Full Name:
    Alberto
    Please pm the details, cost, etc.

    Regards, Alberto
     
  20. Nickrry

    Nickrry Karting

    Jan 4, 2009
    156
    This is very interesting - please either post info or pm me
    Rgds
    Nick
     
  21. Pantdino

    Pantdino Formula 3

    Jan 13, 2004
    2,069
    Full Name:
    Jim
    It is not clear to me that fitting larger carbs in itself would increase acceleration over the rev band. A larger bore means slower air flow at low revs, so less torque. You MIGHT gain at high revs if in fact the engine can use that much gas mixture.

    However, the Stratos intake will increase the intake tract length and thus increase low rev torque, so that might compensate for the larger bore.

    The main advantage of IDF carbs is that they don't starve the engine in left turns and can be tuned more fully by an expert (IIRC)
     
  22. rosso corsa motorsport

    rosso corsa motorsport Formula Junior

    Nov 30, 2008
    268
    #47 rosso corsa motorsport, Apr 27, 2014
    Last edited by a moderator: Sep 7, 2017
    this carbs are fitted under std Engine lid no modification made to it, original 44 IDF carbs, 26, 26, 27 this Engine produce 205 hp at 7500 rpm
    Image Unavailable, Please Login
     
  23. stratos

    stratos Formula Junior

    Dec 9, 2003
    637
    Switzerland
    With the lid closed?
     
  24. rosso corsa motorsport

    rosso corsa motorsport Formula Junior

    Nov 30, 2008
    268
    YES FULLY CLOSED
     
  25. 4CamGT

    4CamGT Formula 3
    Silver Subscribed

    Jun 23, 2004
    2,138
    Southern California
    Peter,

    Very interesting project! How much clearance once the lid is closed? Any room for an air cleaner assembly? Could you detail out all the parts you used to convert?

    Freeman
     

Share This Page