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Thread: 6.2 vs 6.5

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  1. #1
    Join Date
    Sep 2003
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    Feeniks, Aridzona
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    1,114

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    I also posted this over on the 6.5 forum - I am posting here also to get opinions from the 6.2 crowd.

    My project started as swapping a 6.2 into a Jeep Grand Wagoneer. I have been looking for an engine and just came across a 6.2 and a 6.5(non-turbo). They are both military engines, and both have been freshly rebuilt (at the local depot). Both are complete (except for alternators), and the 6.5 has no oil pan.

    So, it is decision time. The 6.5 is $400 more than the 6.2. Should I go with the 6.2 or the 6.5?

    I don't know if this will affect the decision, but I have been working with Banks to put together a turbo for my Waggy. Whichever engine I do install will get a turbo.

    Thanks!

    Mark
    1987 Jeep Grand Wagoneer...new 6.5 in process...diamond block, 18:1's, other goodies...


  2. #2
    britannic Guest

    Post

    IMHO, the 6.5LTD for the better designed pre-combustion chambers, slightly easier to access injectors, more displacement, increased heat rejection/better cooling and of course more power.

  3. #3
    Join Date
    Jul 2003
    Location
    Dallas TX
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    7

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    The larger 6.5 has better performance and more modern design features, but are they as reliable, or hopefully more reliable than the 6.2 without needing to replace water pumps, Injector pumps, oil pumps, FSD's, etc?
    1998 K2500 Escalade/Suburban 6.5 TD<br />1997 K3500 Ext.Cab Dually 6.5 TD<br />1983 K2500 Suburban 6.2<br />1983 K1500 Suburban 6.2<br />1983 C1500 Suburban 6.2

  4. #4
    Join Date
    Sep 2003
    Location
    Feeniks, Aridzona
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    1,114

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    Keep in mind that this is a NON-turbo 6.5.

    Interesting that the response from the 6.2 people is to go with the 6.5, and the response from the 6.5 board was to go with the 6.2. I guess the grass is always greener...

    Thanks for the input. Anyone else want to add anything?
    1987 Jeep Grand Wagoneer...new 6.5 in process...diamond block, 18:1's, other goodies...


  5. #5
    Join Date
    Nov 2002
    Posts
    30

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    a 6.5 has all the latest enhancements to increase longivity/reliability. The 6.2 would give you slightly better mileage than the 6.5.

    I would suspect those in the 6.5 world like the 6.2 world because the earlier 6.2's did not require any computer and all of its sensors to control the fuel timing and transmission shifting.

    A 6.5 with a mechanical injection pump and a transmission w/out computer support would be the best of both worlds...

  6. #6
    Dieselboy Guest

    Talking

    I love my 6.2L way too much to drift over to the other side. In all seriousness, this engine has been easy to work on, had great parts availability, and had decent power even without the turbo. Power after the turbo is a whole other story.

  7. #7
    Join Date
    Apr 2003
    Location
    Portland, OR
    Posts
    179

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    One thing to sway you to the 6.2 - if it's an 83 block. That's the high nickel content block and has purportedly had superior durability and is supposedly less prone to cracking.

    However, since these are supposed to both be military blocks, I've heard that this factoid is irrelevant.

    Otherwise, I have to agree - newer is better.
    Eric D<br />\'83 Southwind 6.2L diesel puller<br />88 K5 Blazer FOR SALE -&gt; <a href=\"http://www.lvmt.net/1988k5/page_01.htm\" target=\"_blank\">http://www.lvmt.net/1988k5/page_01.htm</a>

  8. #8
    Join Date
    Jul 2003
    Location
    Dallas TX
    Posts
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    WOW, I never knew that Eric. I guess thats why my three 1983's have been so good to me (knock wood).
    1998 K2500 Escalade/Suburban 6.5 TD<br />1997 K3500 Ext.Cab Dually 6.5 TD<br />1983 K2500 Suburban 6.2<br />1983 K1500 Suburban 6.2<br />1983 C1500 Suburban 6.2

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