Forged crank - 1290cc SOHC?

Discussion in 'Discussion Forum' started by MikeHynes, Aug 20, 2019.

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  1. MikeHynes

    MikeHynes True Classic

    Location:
    Goodfield, IL.
    Did Fiat put a forged crank in any 1290cc SOHC engines? Industrial, marine, whatever??
    If so...where can I get one?
     
  2. Dan Sarandrea (Phila)

    Dan Sarandrea (Phila) Waitin' On Parts...

    Location:
    Philadelphia, PA
    I think Jeff Stich and Chris Obert would know this as it pertains to any FIATs shipped to the USA.

    Steve C (aka fiatfactory) would have a handle on this as it pertains to ROW (Rest Of World).

    I'm guessing no, at least not in anything offered at retail....the stresses experienced by consumer cars just don't justify the added expense. PBS's 1600cc/ 68mm cranks were ductile cast iron. Maybe some race-only stuff, either by FIAT, Abarth, or another race-oriented supplier?

    The only thing forged that I recall being discussed, are the con rods on the 1500, forged from the factory.
     
  3. Jeff Stich

    Jeff Stich True Classic

    Location:
    Norco, CA
    None that I know of.
     
  4. Simon Oaten

    Simon Oaten Daily Driver

  5. fiatfactory

    fiatfactory Steve Cecchele

    Location:
    Western Australia
    never seen a forged 55.5 crank from the factory...

    plenty of aftermarket sources, but not cheap.

    Cheaper options are often cut from a billet, but that isn't a true forged item... forging is a much more expensive process.

    If something from the Fiat range was to be close and fit and be forged, it would probably be from a small displacement Fiat diesel.

    SteveC
     
    MikeHynes likes this.
  6. MikeHynes

    MikeHynes True Classic

    Location:
    Goodfield, IL.
  7. MikeHynes

    MikeHynes True Classic

    Location:
    Goodfield, IL.
    Thanks Steve, I was hoping to find a Fiat source, but I would be interested in aftermarket sources too. Can you give me any suggestions where I could find an aftermarket source, even billet?
     
  8. MikeHynes

    MikeHynes True Classic

    Location:
    Goodfield, IL.
    Thanks for the replies, I became interested in this topic after inspecting a few cranks that I've got. One of them was significantly beefier, but it didn't look like a forging, and doesn't really "sound" like one either. The crank that caught my attention is a Fiat crank and it was significantly heavier (before it was lightened).
    Can anyone shed some light on which Fiat 1290 SOHC cranks were beefed up?
     
  9. Dan Sarandrea (Phila)

    Dan Sarandrea (Phila) Waitin' On Parts...

    Location:
    Philadelphia, PA
    That price is in Argentinian Pesos, which also uses the $ symbol. Converts to about $128 USD
     
    AKimball92 likes this.
  10. fiatfactory

    fiatfactory Steve Cecchele

    Location:
    Western Australia
    Nothing in any IAVA literature I have (which admittedly isn't much) mentions anything about forged cranks... certainly not for the 90/100/102hp models I have sales brochures and literature for, so I would wonder about anything from south america being what you want (or any different to what you already have)

    Mike, In eastern europe there is still class racing that the sohc 1116 and 1290 are popular / successful in, so contact someone like Bojan (Stole's race shop) or Sime (Fiat race parts) or Andrea (chats here on the forum) in Croatia / Serbia / Greece as they will have access to cranks for more realistic money than what is coming out of Italy.

    SteveC
     
  11. Rupunzell

    Rupunzell Bernice Loui

    Location:
    California
    Stock Fiat crank has been problem free even in endurance race conditions. Simply do not see any need for an aftermarket crank.

    The PBS 1600 stroker cranks were cast iron, recently a friend who is trying to resurrect a PBS 1600 SOHC discovered the PBS 1600 crank has stress cracks and cannot be used.

    The solution, 1600 stock Fiat crank and SCAT connecting rods.

    Bernice

     
    kmead likes this.
  12. Simon Oaten

    Simon Oaten Daily Driver

    IAVA made fiat products under liscence ......

    they also self-developed the SOHC for their "hot" road versions. some of the IAVA cams are very good for road use !

    I believe its only the "early" versions that had a forged crank. Later 128's went to a std cast version. I don't know which years this occurred.

    as Bernice said - the std Fiat cast iron (SG) shaft is pretty durable. its induction heat treated, decent grade of material and has rolled fillets.

    Fiat changed the material with the introduction of the Stilo / Marena / Brava versions of the SOHC (DOHC headed) engine - its a different type of heat treatment - search "ADI crankshafts"........

    Fiat also went to the trouble of factory lighteneing the later versions of 1500/1600 engines with scalap's betwixt the crank webs....again this is obvious when one looks at them.

    if you wanted to turn the engine to 10-11k, or had a long stroke version, or put 30psi of boost throu the thing - then a better spec of material might be useful......

    rgds
    simon
     
  13. MikeHynes

    MikeHynes True Classic

    Location:
    Goodfield, IL.
    Thanks all for the info. There are quite a few different cranks out there, it's nice to have a choice.
     

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