Intake Plenum Cold Start Injector Surface | FerrariChat
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Intake Plenum Cold Start Injector Surface

Discussion in '308/328' started by Imatk, Oct 10, 2025 at 4:18 PM.

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  1. Imatk

    Imatk Formula Junior

    May 6, 2007
    832
    #1 Imatk, Oct 10, 2025 at 4:18 PM
    Just had my plenum powder coated. And despite me SPECIFICALLY telling them I didn't want them to blast ANY of the surface that doesn't already have paint on it... they did anyway.

    So I've sanded all of the surfaces with 400 grit and knocked them down smooth.

    I don't think there will be an issue with the throttle part since that is gasketed, and the lower ports have a beefy gasket.

    BUT the cold start injector does not have a gasket (at least there wasn't one on there when I removed it)

    Am I going to have an issue with leakage there without a gasket?

    My thought at this point is to use a little RTV just enough to fill in the imperfections and go with that.

    But wanted to post here for any sage wisdom.

    Thanks for any help.
     
  2. miketuason

    miketuason F1 World Champ
    Owner Silver Subscribed

    Feb 24, 2006
    15,842
    Cerritos, CA.
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    Mike
    #2 miketuason, Oct 10, 2025 at 6:54 PM
    I think the cold start valve has an o-ring instead
     
  3. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,956
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    #3 Steve Magnusson, Oct 10, 2025 at 7:13 PM
    I know on TR they eliminated that gasket, and if both surfaces are flat and smooth it shouldn't be a problem, but, on the V8s, I believe they did have a gasket there -- item 10 here:

    https://www.ferrariparts.co.uk/diagram/ferrari/308-gtbi-gtsi/010-fuel-injection-system-fuel-distributors--lines
     
    Imatk likes this.
  4. Imatk

    Imatk Formula Junior

    May 6, 2007
    832
    #4 Imatk, Oct 11, 2025 at 8:05 AM
    Yeah the valve itself does, but I'm talking about the metal housing the bolts onto the plenum
     
    miketuason likes this.
  5. Imatk

    Imatk Formula Junior

    May 6, 2007
    832
    #5 Imatk, Oct 11, 2025 at 8:09 AM
  6. ModenaInv

    ModenaInv Karting
    Silver Subscribed

    May 10, 2014
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    South West Michigan
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    Dave
    #6 ModenaInv, Oct 12, 2025 at 9:40 AM
    Steve,

    What's your opinion on where to purchase parts? Who's got the best selection and knowledge? I'm in the US and never have purchased from the UK or from Europe. If so, are the prices comparable with shipping? Shipping time? Thanks Dave
     
  7. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,956
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    #7 Steve Magnusson, Oct 12, 2025 at 10:06 AM
    I'm not the best person to answer those questions as I've been out of the F world for a couple of years, and I rarely relied on anyone else's help -- I just knew what I wanted to buy. I'd certainly review all of the online F part suppliers (in both the US and Europe) as a price sanity check. It has changed a lot over time -- when I bought my ex-308 in 1987, you almost had to know someone who knew someone in Italy (like Geoff O.), and I sure miss the McCanns and their really useful website.
     

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