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Stratos induction system on 246GT

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

  1. 4CamGT

    4CamGT Formula 3
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    #126 4CamGT, Aug 26, 2016
    Last edited by a moderator: Sep 7, 2017
  2. GermanDino

    GermanDino F1 Rookie
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    very cool.... :)
    do you have a picture with air box....
     
  3. 4CamGT

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    Matthias,

    Thanks! I'm in the process of fabricating the air box. We digitized the complete deck lid and induction assembly/motor before we did the install so we knew exactly the space we were dealing with. I'll email you some preview images of what I'm planning. Once I've done some testing with it, I'll share it back here. My goal was good performance, simple, non-evasive (reversible) and visually period correct.

    Freeman
     
  4. 4CamGT

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    #129 4CamGT, Aug 26, 2016
    Last edited by a moderator: Sep 7, 2017
    For testing I installed a set of 25mm tall velocity stacks. Fits under the deck with clearance enough for air flow. I took my Dino out for a long drive. Start up is immediate w/o any choke. The sound is nirvana! Beautiful response. No hesitation in tight fast turns. No popping on deceleration. Just great consistent power throughout the rev range throughout the gears. At the end of the run, I let it sit for a few minutes to try a hot restart. No issues. I didn't even have to put my foot to the floor. No vapor lock. Air temperature was about 80 degrees. I'm a happy camper!

    Freeman
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  5. ///Mike

    ///Mike F1 Veteran

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    Those carbs look great installed! Looks like a dose of steroids for the V6. Cool mod.
     
  6. Fred Winterburn

    Fred Winterburn Karting

    Jan 27, 2015
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    Congratulations Freeman, A modification that could have been done at the time the car was manufactured or shortly thereafter, to me is always better than a high tech modern solution. It keeps the character of the car intact and in period. In this case, because it works so well, makes your car worth even more in my opinion. It certainly does look cool too. Just a little envious, Fred

     
  7. 4CamGT

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    #132 4CamGT, Aug 27, 2016
    Last edited by a moderator: Sep 7, 2017
    Fred,

    Thanks! I believe it was originally developed for the Ferrari F2 based on the Dino motor. It could also have been developed solely for the Stratos. I am curious about the development history if anyone knows.

    What I can say is it's a total blast to drive!!!! I have never experienced this to this level in a Dino. It begs to be driven more aggressively. Amazing full power out of a tight turn with not a hint of hesitation! You feel in complete control between the motor, gearbox, brakes and steering. I think I have found the perfect setup for me. Your CD ignition, NOS original Marelli points distributor and the Stratos Weber IDF 40's! "Period Correct"!

    I took it to our C&C today.

    Freeman
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  8. Telaio

    Telaio Karting

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    * Yes, it all fits below the stock deck! I designed a special airbox with velocity stacks of my own design that fits below the stock deck lid. The next step will be to begin testing it. I will share more As I progress. *

    Does that mean your going to hide those tasty inlet trumpets ????? looks great, cheers Kev.
     
  9. 4CamGT

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    Kevin,

    I just sent you an email with some images. I'd appreciate your thoughts. I can't believe the difference these carbs make on the overall drivability and fun factor! I can imagine your throttle body injection is at another level again!

    Freeman
     
  10. Edward 96GTS

    Edward 96GTS F1 Rookie

    Nov 1, 2003
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    nice setup! will it be at c and c again this weekend?
     
  11. Telaio

    Telaio Karting

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    My 328 injected Dino is at your full disposal any time you are in the UK ........ looking forward to sharing the experience, cheers Kev.
     
  12. 4CamGT

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    Thanks Kevin!

    Freeman
     
  13. 4CamGT

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    Ed,

    Thanks! What an amazing difference! What should have always been on the Dino! I think it could have been a successful comp car with this setup much like the Stratos. I won't drive it to C&C tomorrow. Anytime you want a ride, let me know!

    Freeman
     
  14. DinoLasse

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    Hi Freeman,
    Happy to hear that you are pleased with the performance of the IDF setup. The installation looks great!

    I am following all this with special interest because I am already committed to going down the same - or at least similar - road: A Dino that is being prepared for me will have IDF carburetors. (In my case, it will be the even larger 44IDFs, with slightly taller intake horns. But more about that later.)

    Great to hear that you have been able to unlock some of the hidden potential in the Dino. And all that accomplished with reversible and period correct modifications that keep the vintage character of the engine. Definitely the way to go. Enjoy!
    Lars
     
  15. NYC Fred

    NYC Fred Formula Junior

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    Well, not the first time Enzo's been referred to in that manner...
     
  16. 4CamGT

    4CamGT Formula 3
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    Lars,

    I'll be interested also in hearing about your journey! With taller intake horns I imagine you'll have a raised deck lid? If you do, in my opinion it is best to use the original design lines only slightly raised. I think this can be done to where it's very difficult to see where it was modified. The IDF 40's are more than enough for a stock motor. This was the original Stratos Stradale spec.

    The direction I'm steering towards is keeping the original deck lid without any modifications. I've designed an enclosed air box that is fed cold air from the original side air intake through the stock filter unit. It all fits with either a 25mm tall trumpet or a special short mushroom I designed. Testing will yield which one will be best. Of note, the original Stratos air box was extremely compact and had no trumpets inside. I want to create a ram air effect.

    We've done it all digitally first by scanning everything. This allows me to problem solve every packaging issue before we even make the first mock-up. The other goal is making it non-evasive and completely reversible by using what's already there. Once I'm happy I'll share back the findings.

    Freeman
     
  17. Pantdino4

    Pantdino4 Karting

    Sep 17, 2015
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    Freeman,

    When I got my Dino with IDFs I put it on a chassis dyno and found it was jetted too lean. So the jets were changed and it drives better. The fact that yours starts without the choke makes me wonder if it is running too rich, as cars should require some form of enriching when cold starting.

    Did adding the velocity stacks change the sound at all? I think it will be difficult to make an air box that has room for stacks, has enough room for air flow into them, and still fits under the stock cover.

    If you make the air box cover of Lexan you will still be able to see the stacks, but it is thicker than steel so takes up more height space.

    Jim Oddie
     
  18. 4CamGT

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    #143 4CamGT, Sep 3, 2016
    Last edited: Sep 3, 2016
    Jim,

    I don't think it runs rich. It seems just about right. They feel nicely tuned. Just my initial feeling. My stacks are only 25mm tall. Not as tall as yours. My preliminary work shows it'll work. I want it to look Period Correct OEM. That's the goal anyway. The sound is much sportier and energized. More immediate.

    Freeman
     
  19. swift53

    swift53 F1 Rookie
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    #144 swift53, Sep 3, 2016
    Last edited by a moderator: Sep 7, 2017
    Racing stacks for my Alfa are 1 3/8" tall, made of fibreglass. can be made shorter and are the best design i have yet to encounter, and do they flow...

    Can they be made to fit Stratos carbs? Depends on throats centers and diameter.
    The DCOE are 45mm

    Regards, Alberto
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  20. 4CamGT

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    #145 4CamGT, Sep 3, 2016
    Last edited by a moderator: Sep 7, 2017
    Alberto,

    Yes. I've developed something similar but looks like a flat bottomed mushroom that's only 10mm tall. Idea is to create a ram effect super flow in the air box. I'm encouraged because the Stratos Stradale didn't have any air horns in its air box. I tested my Dino w/o air horns before I put on the 25mm ones. It actually ran pretty good. I'd love to try yours but much shorter.

    Freeman
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  21. swift53

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    Freeman, love your kit! My airhorns can be recast as they are fibreglass, but would need much more to go on dimensionally.

    I think I have a couple of IDF from a Fiat, unfortunately only 2, and can look at them to see if something similar but much lower could be made. First I have to find them.

    There are super low nuts that would help considerably to lower the height, and the body of the stack can be made lower, or even access the carb studs through the mushroom head via holes drilled in them to reach the flange, then plug with silver RTV.

    Complex but doable.

    Will not be able to try anything for quite awhile, but can try something down the road. Meanwhile I will follow this thread with huge interest.

    I have work coinciding, so I managed to squeeze going to Goodwood, if anybody from Dinoland are going, please let me know and we can meet.

    Will also be able to go visit Facetti in Milan, and will ask him a question or two, as he is kind but does not tolerate time wasters.
    Possibly a little wine...:)

    Regards, Alberto
     
  22. cnpapa24

    cnpapa24 F1 Rookie
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    What a cool thread. Thanks for all of the info. I have a Stratos Stradale if anyone needs any info from the car as a reference.
     
  23. 4CamGT

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    This is now getting interesting and helpful!!! Alberto, If you PM me your email, I'll send you some digital shots. A stack like yours at around 15 - 20mm high with mounting access holes drilled through the mushroom would be best. I think DCOE and IDF have the same mounting locations? cnpapa24, that would really be helpful! A shot inside the air box with the lid removed would be of value. I only have the Stratos parts catalogue with illustrations.

    Freeman
     
  24. cnpapa24

    cnpapa24 F1 Rookie
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    Will do, Freeman. I will get out there later this week and take some photos.

    Chris
     
  25. 4CamGT

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    Thanks Chris! That's the great thing about this forum! Sharing and learning!

    Freeman
     

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