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Review of the MA5 cap to replace Mallory 2 piece 4001

Discussion in 'The Hokey Ass Message Board' started by tjet, Nov 26, 2009.

  1. tjet
    Joined: Mar 16, 2009
    Posts: 1,276

    tjet
    Member
    1. Early Hemi Tech

    This is a review of the Napa Echlin MA5 cap that replaces the Mallory 2-piece cap # 4001 that goes on the YC & ZC distributor. I’m writing this to give you some insight on this replacement cap, & to help you save some money.

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    I ordered the MA5 cap <ST1:p</ST1:plast week because I wasn’t willing to spend the money to find a used cap online. Hot rodding is NOT about spending $200 on a expendable Mallory NOS distributor cap!


    The first thing I noticed was how heavy it felt, similar to the Mallory. I was initially thinking it would be a small version of the regular Delco window cap (thin & cheap), but it’s not. It’s more like they used the 4004 lower half in the mold, & custom made the top for a 1-piece unit. The quality is excellent. The thickness & finish feel about the same as the original Mallory. It also has the same outside dimensions.

    [​IMG]
    <O:p</O:p
    [​IMG]
    On the inside, the MA5 has some differences over the 4001. First of all, it has 2 ribs that surround the center button instead of one. This gives more surface area in the cap to lessen a short on the inside surface. This may be an advantage if you plan on running a high power ignition system.

    <O:p</O:pAnother advantage is the option to use better wires. Even though Pertronix makes a nice black 7mm wire, I can now step up to the Taylor 8.2 Thundervolt wires.

    <O:p</O:pOverall, for the $16 I spent on this cap, I am very happy with it. It’s still a small cap which will clear my intake & firewall, & it looks good. Since I plan on driving my vehicle a lot, I will save my NOS 4001 cap & 7mm wires for the shows.


    The rotor replacement is p/n MA-7

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    [​IMG]

    more pics below


    http://59chevypickup.webs.com/apps/photos/album?albumid=7596653
     
    Last edited: Apr 6, 2012
    Ric Dean likes this.
  2. Bill Schickling
    Joined: Feb 13, 2008
    Posts: 119

    Bill Schickling
    Member

    Wow! Do they make an equivilent cap for us 6 cylinder guys?
     

    Attached Files:

  3. tjet
    Joined: Mar 16, 2009
    Posts: 1,276

    tjet
    Member
    1. Early Hemi Tech

    They might, but I don't have the p/n. BTW, the p/n for the YC rotor is MA7. I haven't ordered one of those yet.
     
  4. Dirty2
    Joined: Jun 13, 2004
    Posts: 8,903

    Dirty2
    Member

    Good info . Thanks !
     

  5. Bill Schickling
    Joined: Feb 13, 2008
    Posts: 119

    Bill Schickling
    Member

    I went poking around on the Napaonline store and found this for the six cylinder.

    Part number: MA10
     

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    Last edited: Nov 26, 2009
  6. buickvalvenut
    Joined: Oct 29, 2008
    Posts: 660

    buickvalvenut
    Member
    from Rialto

    do they also have a replacement rotor to go with this cap?
     
  7. titus
    Joined: Dec 6, 2003
    Posts: 5,078

    titus
    Member

    Hows about a 4cylinder cap? im gonna dig in my books to see what i can find.
     
  8. 28 jalopy
    Joined: Jan 16, 2010
    Posts: 208

    28 jalopy
    Member
    from arizona

    X2 on if they have A replacement rotor! and if it would fit a original 2 piece cap.
     
  9. titus
    Joined: Dec 6, 2003
    Posts: 5,078

    titus
    Member

    i went thru my borg warner catolog and looked, i found the 8 and 6 cylinder caps but no 4 cylinder.
     
  10. You could probably use the 8 cyl cap on a four and just plug the unused posts... ugly, but effective.
     
  11. gasserjohn
    Joined: Nov 9, 2008
    Posts: 1,219

    gasserjohn
    Member

    i bought a nos mallory 2pc cap complete dist ....the guy also sent me some stuff he had.......including a brown 2pc mallory cap 8cly that inside the cap on ever other cly there was a grd strap running to where it would contact the dist housing when installed >was this factory or???the 4 unused positions on cap where undrilled makes me think from factory or special order................
     
  12. Bruce Lancaster
    Joined: Oct 9, 2001
    Posts: 21,682

    Bruce Lancaster
    Member Emeritus

    For years most banger people have used the more findable 8 cylinder inner under an ancient 4 cylinder outer cap. You can still go with the 8, but now it will look like hell...
     
  13. tjet
    Joined: Mar 16, 2009
    Posts: 1,276

    tjet
    Member
    1. Early Hemi Tech

  14. HEATHEN
    Joined: Nov 22, 2005
    Posts: 7,591

    HEATHEN
    Member
    from SIDNEY, NY

    Well, he even says in the item description that they are made by Echlin. If you read that and still pay him $100 without checking it out at your nearest NAPA store first, you deserve to be fleeced.
     
  15. tjet
    Joined: Mar 16, 2009
    Posts: 1,276

    tjet
    Member
    1. Early Hemi Tech

    BTW, I also have an old brown bakelite Mallory cap - p/n 24001

    Does this cap use a different rotor from the 4001 black cap?
     
  16. Shaggy
    Joined: Mar 6, 2003
    Posts: 5,208

    Shaggy
    Member
    from Sultan, WA

    I just buy $20 distributers and rob the cap offa them, the original mallory caps are near indistructable and probably will outlast your motor anyway.....
     
  17. flathead4d
    Joined: Oct 24, 2005
    Posts: 889

    flathead4d
    Member

    What's the difference between the 4001 and the 24001 cap?
     
  18. titus
    Joined: Dec 6, 2003
    Posts: 5,078

    titus
    Member

    The contact points are different from each other and take a different rotor, Alchemy did a post about it a while back.
     
  19. tommy
    Joined: Mar 3, 2001
    Posts: 14,757

    tommy
    Member Emeritus

    [​IMG]

    The classic 4004 cap is the only reason that I run the old Mallory dist.:D

    My mistake the old cap is a 4004.
     
    Last edited: Apr 6, 2012
  20. tjet
    Joined: Mar 16, 2009
    Posts: 1,276

    tjet
    Member
    1. Early Hemi Tech

  21. oj
    Joined: Jul 27, 2008
    Posts: 6,263

    oj
    Member

    Is the replacement gasketed like the original?
    I wonder if it can be used on the super-mag or if the voltage will just blow thru it?
     
  22. alchemy
    Joined: Sep 27, 2002
    Posts: 17,098

    alchemy
    ALLIANCE MEMBER

  23. gasserjohn
    Joined: Nov 9, 2008
    Posts: 1,219

    gasserjohn
    Member

    thought i had photos but only found these poor scans of the actual cap
    cap is only drilled for four of the eight ....if you look close at scan inside cap you can makeout the grd straps that connect every other segment of cap to grdout on the dist housing when cap is installed on dist////on thinking about this it would have worked better to just remove every other lobe on the dist cam don't you think so too???
     

    Attached Files:

    Last edited: Apr 15, 2012
  24. tommy
    Joined: Mar 3, 2001
    Posts: 14,757

    tommy
    Member Emeritus

    I never throw away an old Mallory 2 piece cap. I keep some very worn out glass bead powder around to bead blast the terminals to get rid of the corrosion. I dust the cap pieces with some clear from a spray bomb just enough to restore the natural color. They come out looking like new. The caps are pretty beefy when compared to a GM window points cap. I've never had one crack so if you get rid of the corrosion and restore it cosmetically it will be fine IMHO. If you have an old unsightly cap give it a try.


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    It broke my heart to have to sacrifice this cap so that the ignition could be phased but you do what you got to do.:D
     
    Last edited: Apr 16, 2012
  25. The MA5 is on back order from the factory with no idea when they will make new ones so that is a big bummer hopefully they actually make some soon
     
  26. big duece
    Joined: Jul 28, 2008
    Posts: 6,261

    big duece
    Member
    from kansas

    I checked today, my Napa guys said No Bueno for now, but can order the ma7 rotor.
     

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