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Thread: 2M/4M power comparisons

  1. #1
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    2M/4M power comparisons

    I'm wondering if a few 2M/4M people can weigh in on this for me:

    One of my favourite daily drivers was a 2M powered 69 Crown automatic. That car was surprisingly fast. A few years down the road I ended up with a 74 Corona Mk II that had a 4M, also auto, and it was quite a slug really. Not underpowered, but way below what the 2M was. I timed it, replaced everything about the ignition, rebuilt the carb, and nothing seemed to be able to coax more power out of it.

    I had a conversation with a long-time Toyota dealership owner about it once, and he said he remembered a lot of the 4Ms coming back within a couple years after they were bought with similar complaints. He mentioned that he remembered the problem being that the camshaft wore more quickly than expected, and that this wasn't a problem which the 2Ms had. That Corona Mk II caried on without me and I never got it running as I thought it should.

    So, fast forward ten years, and I'm again considering a 4M Mk II project, or a 2M Crown (or an 18RC Corona.) I know the easy swap for the Mk II would be to plumb in a 7M, but I like going for the stock look. What's been people's experience with getting decent power out of an older 4M? Are they almost always a bit anemic?

    Thanks.

  2. #2
    Senior Member
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    Dec 2009
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    southern PA
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    Re: 2M/4M power comparisons

    my 4me was always a dog.... it ran sluggish since i bought my cressida.

    it finally gave up and blew a headgasket, and that's where the 2jz comes in

  3. #3
    Senior Member
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    Re: 2M/4M power comparisons

    4ME isnt really relevant to this thread, that engine is a whole different animal.

    4M has a hemi head, so that's good. But their hp weakness is in the ports, runners, and manifolds. Spend your time and effort there first. So maybe some porting, headers, and a better intake manifold/carb setup. But headers are going to be tough to find.

    I doubt many if anyone on this forum has any experience getting power out of 2Ms or 4Ms. If you want a bigger newer motor that looks old school, grab a 5ME with high comp 7M pistons, headers, porting, sidedraft carbs or even better, Ford 4.9 ITBs and Megasquirt. But that would be quite a build ($$$).

  4. #4
    Senior Member
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    Texas
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    Re: 2M/4M power comparisons

    I'm willing to bet that another reason for the seemingly huge power difference in the 69 Crown and 74 MarkII had to do with different rear end gearing.

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