who's in, who's waiting? new belt cam design is done and manufacturing begins now! | FerrariChat

who's in, who's waiting? new belt cam design is done and manufacturing begins now!

Discussion in 'Technical Q&A' started by smg2, Feb 14, 2006.

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  1. smg2

    smg2 F1 World Champ
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    okay, i'll post from the other thread. i have a 2wk lead time on the stock and then another few weeks for machine and ano. looks like the hard work paid off as i now have a new pulley belt layout with adjustability for the 308 motor. we get to use the gates GT2 belt in 8mm pitch and have increased our life span by a minimum of 2X's! the 8mm withstands 10k rpm and & 225hp at the drive pulley as where our old 'L' went 6k rpm and 9hp at the drive pulley. the GT2 also runs at half the decibles also, much quieter.
    any takers for the first run?
     
  2. GrigioGuy

    GrigioGuy Splenda Daddy
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    This is for the 2 valve version, correct?
     
  3. smg2

    smg2 F1 World Champ
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    yes 2v version, if anyone knows of the difference between the 2v & 4v please share as i can easely at this point make a 4v version for those interested.
     
  4. smg2

    smg2 F1 World Champ
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    i did a quick check, the 4v and the 2v share the same pullies. the belt is shorter on the 4v. so all i need is how many teeth are on the 4v belt. then i can source the correct gt2 belt.
     
  5. Sloan83qv

    Sloan83qv F1 Rookie
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    for what it may be worth:

    I believe that the 328 cam pulley has a smaller center hole then the 308 which would not allow the 308 4 valve pulley to work on the 328 4 valve cam.
     
  6. GrigioGuy

    GrigioGuy Splenda Daddy
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    Thanks for the clarification
     
  7. smg2

    smg2 F1 World Champ
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    what holes are different? the bolt hole or the access hole to the bolt? for my new design the only holes shared by the oem pulley and the new is the bolt hole the rest is modified per the design. it may work it would just need a different belt. i would be interested in knowing which hole is different maybe ther is a way to make it work for the 328 crowd also.
     
  8. smg2

    smg2 F1 World Champ
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    have i hit a wall here? i need to give the machine shop a quantity of peices and would like order as many as possible for the first go around, becouse after that i do have a standing offer from a dealer to carry them and i'm sure the price will jump from what i can offer now. i'm trying to get the first orders at or under 1k.
     
  9. Artvonne

    Artvonne F1 Veteran

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    I assume your still planning an adustable cam pulley with that verier scale? I'm in.
     
  10. jeffdavison

    jeffdavison F1 Rookie

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    I'd like a set for a 308QV, but I have to wait for my tax refund (or sell off some junk on eBay). April / May time frame will work best for my cashflow and allowances for discretionary spending. I'm doing brakes, tires and clutch for my 355 for this year. The pulleys would be for my 308qv engine going in my long term Stratos replica project, so they aren't a priority at the moment, but I would definately like a set... but if the price is really good because of a qty buy, I just may be able to jump on, as this may just be a one shot, one time deal?

    JD




     
  11. smg2

    smg2 F1 World Champ
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    #11 smg2, Feb 14, 2006
    Last edited by a moderator: Sep 7, 2017
    yes they will include the scale, heres a pic again.
    i really hope this isn't a one time shot for these, but with a distrubtor coming on line after the initial first run, i'm not sure if i can under cut him. to be seen i guess.

    if someone with the qv motor knows how many teeth are on the stock belt please let me know, it should be on the markings on the belt. i.e. the 2v belt markings are 254 101, which mean 25.4mm wide and 101 teeth. with the tooth number for the qv belt gates can do a cross over to the right sized 8mm belt.
    Image Unavailable, Please Login
     
  12. smg2

    smg2 F1 World Champ
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    time frame is this:
    2wks for stock
    6wks for machine time
    8-10wks total for finished product, so were looking at april/may. hopefully april.
     
  13. Artvonne

    Artvonne F1 Veteran

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    Any idea how far those allen head screws protrude? I didnt check front clearance on the timing cover, but I can if need be.

    Does anyone know if the cam belt dust shield that fits behind the belt cover of the QV's will retrofit to a two valve? Would be nice to help keep debris out of there.
     
  14. smg2

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    0.200 " or less than a 1/4". i think clearance should be okay.
     
  15. jeffdavison

    jeffdavison F1 Rookie

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    Brand new stock 308QV belt from TRW / Federal-Mogul has the following sets of numbers on the belt itself: 720, and 48-14003

    The number label on the box is 99102005

    hand counted 96 teeth each belt.

    Belts gotten from T Rutlands last year and are fresh.

    JD

     
  16. smg2

    smg2 F1 World Champ
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    thanks jeff.
     
  17. GrigioGuy

    GrigioGuy Splenda Daddy
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    When would you need the money? If these fit a 3.2 I'd probably be in.
     
  18. smg2

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    not for awhile, i can front the cost for the stock then it would be for when the machine shop is done. right now i wouldn't have finished product until april, and thats when i would pay the shop.

    as long as i have confirmed orders than i can have those sets made now, and i'd have you pay when they are done. i would like to have those who want a set now (read april) let me know by at least friday so i can put in for the stock, the pulley stock is custom & i'll be using 7075 aluminum, the sizing we need is not stocked so when i order, the more i order the cheaper it gets.

    for the 3.2, does anyone know if they use the same pulley as the 3.0? 30/20 tooth arrangement? if so then its down to whether the cam interface is the same, after that the belt. the belt is the easy part of the equation. now if the 3.2 is different then i can design pullies for that motor based on what i have done for the 3.0. i would need a 3.2 pulley for measurements, this is assuming that they are indeed different. i would think that the 3.2 is simple bore/stroke increase with out effecting the pullies.
     
  19. Sloan83qv

    Sloan83qv F1 Rookie
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    The center hole where the cam centers itself. The 328 pulley has a smaller diameter hole (the 328 cam has a smaller diameter centering ring) then the 308 4 valve. The pulley centers itself on the cam so if you put a 308 pulley on a 328 cam it will wobble as it cannot center itself.

    I have a 308 4 valve that uses 328 cams and had to buy 328 pulleys for the very reason I have stated.

    Paul
     
  20. Martin308GTB

    Martin308GTB F1 Rookie

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    Hello,

    Interesting; now that Scott requests any orders, basic engineering questions occur again.

    Best Regards from Germany

    Martin
     
  21. GrigioGuy

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    I don't know if that was supposed to be an insult, but if I owned a 2 valve I would absolutely buy a set. My 3.2 question was outside the original scope of the great work done
     
  22. Martin308GTB

    Martin308GTB F1 Rookie

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    Sorry, no insult. Just a statement and not even directed to you personally. But I'm a little bit surprised about the number of orders so far compared to new questions about technical details.
    And Scott started this thread to request orders. IIRC there's a separate thread where's a thorough discussion about the technical things.


    Best Regards from Germany

    Martin
     
  23. Verell

    Verell F1 Veteran
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    smg2,
    As a veteran of quite a few group buys, many that went well & some that didn't, I strongly recommend that you:

    1) Collect a deposit up front. I've seen many group buys where 50% to 75% of the 'I'm in' posters dropped out when a 30% to 50% deposit was requested. Most of the drop-outs generally didn't become takers even after when started posting favorable reports after receiving the product.

    2) Post a cut-off deadline (oops, see you've done this).

    I'd really like to sign up, but need to take a serious look at this year's budget before I committ. I just spent big $ on an injection molding machine for Unobtainium Supply & a set of 16" wheels, so my F* budget is about a year overdrawn right now.

    I've been kicking myself because I didn't get in on Ed Gault's pully set, & know that I'll really regret it if I can't figure out how to participate in this opportunity. Especially since I've got the plastic cam gears & have to worry about their teeth wearing.
     
  24. parkerfe

    parkerfe F1 World Champ

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    Someone from N.C. who used to post on FChatt has already designed and sold a new cam belt design with pulleys for a 328 a few years back. Does anyone remember his name?
     
  25. matteo

    matteo F1 World Champ

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    Ed Gault....for the 4v 308
     

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