Magneti Marelli coils | FerrariChat

Magneti Marelli coils

Discussion in 'Vintage (thru 365 GTC4)' started by Jack59, May 20, 2022.

This site may earn a commission from merchant affiliate links, including eBay, Amazon, Skimlinks, and others.

  1. Jack59

    Jack59 Karting

    Joined:
    Apr 1, 2018
    Messages:
    118
    Location:
    Switzerland
    Full Name:
    Jacques Houriet
    I have a question: are the Magneti Marelli BZR 200 A the best coils for a V12 Colombo 128F ?

    Thank you for your advices
     
  2. Bob Zambelli

    Bob Zambelli F1 Rookie Silver Subscribed

    Joined:
    Nov 3, 2003
    Messages:
    3,657
    Location:
    Manning, SC
    Full Name:
    Robert G. Zambelli
    I switched to the Bosche Blue coils on my GTC.
    In my opinion, MUCH BETTER than the Marelli coils.
    Bob Z.
     
  3. Jack59

    Jack59 Karting

    Joined:
    Apr 1, 2018
    Messages:
    118
    Location:
    Switzerland
    Full Name:
    Jacques Houriet
    Thank you Bob

    Did you have to adapt the distributors ?
     
  4. gcalex

    gcalex Formula Junior Rossa Subscribed

    Joined:
    Aug 16, 2010
    Messages:
    607
    Location:
    Mostly New Hampshire USA
    Full Name:
    Alex
    While we are on the topic of coils has anyone ever used the black or red Bosch coils with the standard "block" resistors that the Marellis used?

    If so, were they good? No good?

    Right now, I'm using Bosch blues, but with the the resistors removed, and I'm tempted to try and switch to either the blacks or reds to get the stock look back...
     
  5. TTR

    TTR F1 Veteran Rossa Subscribed

    Joined:
    Mar 29, 2007
    Messages:
    5,890
    Location:
    Riverside, CA
    Full Name:
    Timo
    Alex, before proceeding, you may wish to figure out whether your existing "Bosch" coils or the ones you're considering switching to are externally or internally resisted.
    To my limited understanding, most if not all vintage OEM M.M. coils are/were "externally", hence ...
    ... the external resistor, ...
    ... while others, including some, more modern ones are "internally" and therefor may not require nor perhaps even benefit from additional (external) resistor.
    It's all (or mostly) about the (Ohm) numbers.

    As for the older ones being worse than newer ones, one may wish to consider it from a perspective of new vs. used coils as they too seem to "wear out" or more specifically loose their efficiency in use over time.

    All the above is just from my personal experiences and may not be agreed by those with better understanding of electrical components than I possess.
     
  6. gcalex

    gcalex Formula Junior Rossa Subscribed

    Joined:
    Aug 16, 2010
    Messages:
    607
    Location:
    Mostly New Hampshire USA
    Full Name:
    Alex
    Hi Timo,

    Bosch "blues" have internal resistors.

    Bosch "blacks" are speced to need 0.9Ohm external resistors.

    Bosch "reds" are speced to have 1.8Ohm external resistors.

    Since I have blues, the external resistors are not hooked-up on my car; hence my question; if someone said "I've been using blacks with the Marelli resistors for years, and car starts great, and my points have been fine after thousands-and-thousands of miles", I'd switch to that set up.

    BobZ is basically saying "I've been using blues with no resistors, and..."; which indeed I have seen in some other posts, and is the reason I am currently running blues... :)

    -- Alex
     
  7. Edward 96GTS

    Edward 96GTS F1 World Champ Silver Subscribed

    Joined:
    Nov 1, 2003
    Messages:
    11,080
    i suggest contacting adrian at dinoplex.org.
    he is brilliant.
     
  8. TTR

    TTR F1 Veteran Rossa Subscribed

    Joined:
    Mar 29, 2007
    Messages:
    5,890
    Location:
    Riverside, CA
    Full Name:
    Timo
    Alex,
    as far as I know or understand (which may not be that much) and to put it simplistically(?), it just simple math…

    In recent years, I’ve converted couple of Daytonas (ours and clients) with aftermarket/non-OEM, electronic ignition setups back to points and condenser system, using a brand X coils with OEM M.M. resistors and while both seem to work just as expected, I don’t have enough long term (i.e. mileage) experience from either car to fully endorse the brand X.
     
  9. MiuraP400

    MiuraP400 Formula Junior

    Joined:
    Feb 3, 2008
    Messages:
    951
    Location:
    Arizona
    Full Name:
    Jim
    Alex

    I would measure the resistance of your MM resistors and pair them up to the suitable Bosch coil. You have the hard part Ie the specs for the resistor the coils are designed with.

    Cheers Jim
     
  10. John Vardanian

    John Vardanian F1 Rookie

    Joined:
    Jul 1, 2004
    Messages:
    3,080
    Location:
    San Francisco Area
    Full Name:
    John Vardanian
    The Ferrari resistor halfs the battery voltage; so long as you get 6 volts at the points you are ok.

    john
     
  11. MiuraP400

    MiuraP400 Formula Junior

    Joined:
    Feb 3, 2008
    Messages:
    951
    Location:
    Arizona
    Full Name:
    Jim
    Ag
    Agreed that is common for 12 volt cars with points.

    Cheers Jim
     

Share This Page