Rods! | FerrariChat

Rods!

Discussion in '308/328' started by ferrariowner, Sep 18, 2023.

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  1. ferrariowner

    ferrariowner Formula 3

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    Well my new rods finally arrived. Just another step to getting everything back together.
    There are two pistons rods below. Which one is stock Ferrari and which is Carrillo?

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    ferrariowner, Sep 18, 2023
    #1
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  2. miketuason

    miketuason F1 World Champ Owner Silver Subscribed

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    Left rod is original.
     
    miketuason, Sep 18, 2023
    #2
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  3. Dr Tommy Cosgrove

    Dr Tommy Cosgrove Three Time F1 World Champ Owner Rossa Subscribed

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    How is the Carrillo better?
     
    Dr Tommy Cosgrove, Sep 18, 2023
    #3
  4. miketuason

    miketuason F1 World Champ Owner Silver Subscribed

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    I would say better as in stronger as it has more material across the entire body of the rod.
     
    miketuason, Sep 18, 2023
    #4
  5. Ferraridoc

    Ferraridoc F1 World Champ Owner Silver Subscribed

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    The H beam rod is stronger in torsion and lighter - just a few decades of engineering knowledge and modern production techniques.
     
    Ferraridoc, Sep 19, 2023
    #5
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  6. Ferraripilot

    Ferraripilot F1 World Champ Owner Project Master

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    It's very common that a set of H beam forged rods weight 300 grams or so lighter PER cylinder. Combine that with a lighter forged piston and you're subtracting a pound or so of rotating mass from the crankshaft, which then can itself have more weight removed as it does not need as much weight to balance a heavy rod and piston. This stuff adds up and makes a measurable difference in power output.

    A 360 crankshaft and 308 crankshaft are pretty much the same size, but the 360 crank weighs a solid 10lbs less (31lbs vs 41lbs for 308).
     
    Ferraripilot, Sep 19, 2023
    #6
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  7. Rifledriver

    Rifledriver Three Time F1 World Champ

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    Tommy, the weak link in any Ferrari engine is the connecting rods. In a stock engine they are pretty good but any Ferrari engine run real hard if it breaks is usually the rods. Very few who rebuild Ferrari engines professionally either for performance or just lawns at Pebble Beach use Ferrari rods. It is such a common modification Carillo has 2 catalog part numbers for rods for Ferrari. I just ordered a set of 12 yesterday.
     
    Rifledriver, Sep 19, 2023
    #7
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  8. mk e

    mk e F1 World Champ

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    Help me get this thing finished! https://gofund.me/39def36c
    rods I think are
    Stock= 570g, depending on set
    Carrillo= 395g
    Ferrari Ti = 338g (at least mine are)

    Carrillo says only 103g is rotating which is about 1/3...I think that is about the for all, 2/3 reciprocating, 1/3 rotating

    My forged pistons are 300g....I think stock cast pistons themselves are lighter but way more fragile and the savings is in the wrist pistons but I can't find a numbers easily.

    While googling I saw aliexpress has h beam 308 rods for $1200, those are probably wonderful
     
    mk e, Sep 19, 2023
    #8
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  9. derekw

    derekw Formula 3

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    I did drawings and got quotes under £100 each but decided to stick with original and just use ARP bolts and better pin bushes. If there’s interest I could get a few sets made.
     
    derekw, Sep 20, 2023
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  10. KTinCHS

    KTinCHS Rookie Rossa Subscribed

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    Would you mind sharing those part#s?
     
    KTinCHS, Sep 20, 2023
    #10
  11. Rifledriver

    Rifledriver Three Time F1 World Champ

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    Its not the bolts that break. The people who know these motors best replace the rods. I have a low mile 330 here that already broke one rod.
     
    Rifledriver, Sep 20, 2023
    #11
  12. Rifledriver

    Rifledriver Three Time F1 World Champ

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    The catalog is online and Ferrari is in the table of contents.
     
    Rifledriver, Sep 20, 2023
    #12
  13. Nuvolari

    Nuvolari F1 Veteran Owner Silver Subscribed

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    Nuvolari, Sep 20, 2023
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  14. ferrariowner

    ferrariowner Formula 3

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    ferrariowner, Sep 20, 2023
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  15. Dockboy

    Dockboy Formula Junior Silver Subscribed

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    Carrillo makes some great rods. About 15 yrs ago I had them make me some Cummins 5.9l rods for an 1,800 hp diesel drag motor that I was bending/breaking the stock rods in about every 10 or so passes! They held up great!
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    Dockboy, Sep 20, 2023
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  16. Rifledriver

    Rifledriver Three Time F1 World Champ

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    My machine shop does a lot of hotrod Cummins work. I see those rods at his shop all the time.

    1800 HP. Have any idea how much manifold pressure you were running? And max RPM?
     
    Rifledriver, Sep 20, 2023
    #16
  17. Dockboy

    Dockboy Formula Junior Silver Subscribed

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    Dockboy, Sep 20, 2023
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  18. GSJFerrari

    GSJFerrari Formula Junior Rossa Subscribed

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    Just as an aside, we have a set of lightly used and in excellent condition set of Carrillo rods for a 308 as well as a standard/standard 308 crank. We'd let the lot go to good home for $1500. They were spares that came with a race engine of our's and we don't see us ever using them.

    -Prescott @ GSJFerrari
     
    GSJFerrari, Sep 20, 2023
    #18
  19. Dr Tommy Cosgrove

    Dr Tommy Cosgrove Three Time F1 World Champ Owner Rossa Subscribed

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    What does a Carrillo rod for the 308 cost ?
     
    Dr Tommy Cosgrove, Sep 20, 2023
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  20. ferrariowner

    ferrariowner Formula 3

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    About $2600 retail. USD
     
    ferrariowner, Sep 20, 2023
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  21. ferrariowner

    ferrariowner Formula 3

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    They were so expensive I just bought 1
     
    ferrariowner, Sep 20, 2023
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  22. Dr Tommy Cosgrove

    Dr Tommy Cosgrove Three Time F1 World Champ Owner Rossa Subscribed

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    Seriously?

    Because I can see that being ******** just as easily as it isn't ********.
     
    Dr Tommy Cosgrove, Sep 20, 2023
    #22
  23. Rifledriver

    Rifledriver Three Time F1 World Champ

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    I had heard 100lbs before but had no idea they were going 5000 RPM.
     
    Rifledriver, Sep 20, 2023
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  24. Rifledriver

    Rifledriver Three Time F1 World Champ

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    For a whole set. About the same as a new rod from Ferrari.
     
    Rifledriver, Sep 20, 2023
    #24
  25. Dockboy

    Dockboy Formula Junior Silver Subscribed

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    Can't do 5k with a stock ECU and the rotating assembly needs to be balanced perfectly.

    They have come along way since I was involved in it.

    Check out Ryan Milliken's X275 car. 3,100 hp and it turns 6,300 rpm!



     
    Dockboy, Sep 20, 2023
    #25
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