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Roman

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Posts posted by Roman

  1. 10 minutes ago, Rhyscar said:

    Oh wow. I'd assumed 4gr would be lower spec than a 2gr.. Now I'm a little worried my lifters to rattle themselves to pieces with RPMs. Redline is at 6500 or something silly low though. 

    It seems more likely that a VVT pulley would be the first thing to go. 
    There have been some failures even with standard 2GR motors.
    But you get lots of notice as it will rattle on cold starts if the pin isnt engaging.

    Or otherwise having a rocker fall out. 
    Someone said that Toyota revised the valve springs to a beehive type to address the issue that the earlier motors had with firing the rockers out occasionally.
    However I'm not sure at what point that changed.

    Although, a lot of these things are a non issue if you're keeping to factory rpm limit, for the better part.

    • Haha 1
  2. Yeah these have super grunty 6 bolt main bearing caps.
    2 more bolts come in through the sides of the block.
    But there are two rods between each bearing cap. So win some lose some, I guess.

    I figure this is one of the cases where the modular nature of these motors works in my favour. As it's all setup to be strong enough for the 3.5 (or arguably 4 litre) versions of this engine. 
    So I'll have some more spinny forces going on, but nothing near the loads people are throwing at boosted 2GRs making 700hp or whatever.

    image.thumb.png.4783102e0943582ddba0d367eb498011.png 

    • Like 3
  3. 4 hours ago, shrike said:

    5GR crank for less stroke?

    https://www.youngstarmotor.com/sale-42301339-steel-material-automobile-engine-crankshaft-for-toyota-5gr.html

    And some 5GR rods I am guessing to suit the lower stroke 😛

     

    The longer term plan if the 4GR goes well, and there arent any insurmountable issues. 
    Is to get a 3GR and then put a 2MZFE crank in it. 
    This gives exact same bore and stroke as a 5GR, but uses parts that are a bit easier to source here.
    A friend has a 2MZ for me in storage, and there's a few 3GRs at pickapart at the moment.
    However it looks like the greater difficulty, well before the current stroke length is a limiting factor. 
    Is getting the valvetrain to play along.

    • Like 2
  4. Yeah looks like a little tig blob and will be fine. 

    Time consuming, but cheap and easy fix for everything that has happened. 

    I will see if I can get a head off while the engine stays in the car. 

    I might look at modding the front cover so I can remove it without taking the sump off, as its a major pain. 

    Especially since I'm probably going to need to do it 10x more :iconbiggrin:

    • Like 3
    • Thanks 4
    • Haha 2
  5. 5 hours ago, fuel said:

    Hopefully that valve guide is OK and not tweaked also. Might be worthwhile grabbing a spare pair of heads while they're still cheap and plentiful in case this is a recurring theme. Am kinda regretting not hanging onto a pair of heads from the $100 donor GTO engine I torn down years ago for my current GTO that bent all the valves. I got lucky that it was just bent valves and a few damaged rocker arms, but if I had to start replacing springs, valve guides and seats etc it starts to become uneconomical to repair and just better off with replacement heads. Hopefully head gaskets are cheap and easy to come by for these engines?

    Yeah, they are cheap and common at the moment, and still reasonably low km. 
    So its definitely the intention to buy and wrap up a few whole motors while they're still nicely priced. 
    However they are made right up to 2019 so I'm not anticipating any shortages too soon.

    Shrike - Those two guys above havent actually done it yet. 
    Frankenstein motorworks will get here. 
    Other guy, I wouldnt bet on it.

    I cleaned up the busted rocker and had a test to see if it will tig okay. 
    Looks like it will be sweet as they are same material. 
    So one side the pin was high, the other sunken in, and they both tigged up fine.
    Will just make sure everything is super clean, tungsten is super sharp, and will test on my busted one before piping anything down on a part I'm going to reuse. 

    So all that I have to now, is take the sump off, so I can get the front timing cover off, so I can get the cams out :rolleyes:
     

    • Like 5
  6. 5 hours ago, BigA said:

    Help Hey need some help on 2 fronts here guys.

    I am going to be selling the original motor and gearbox in the wagon to a guy down south who has a left hand drive version of mine and just need some indication of what it would be worth? 2M motor with 5 speed gearbox.

    Also trying to find measurements of the 2gr-fse engine as that is the route I would like to go but can't find any measurements online to see if it would fit.

    Cheers

    Hey, 

    My understanding is the 4GR, 3GR, and 2GR are all physically the same size. Just shorter stroke and so on internally.
    So, at last check there are at least 1x 4GR powered car at each pickapart location in Auckland. and a few 3GR. (3 litre version)
    So you should be able to go eyeball something and measure it. 
    Look on the pickapart website for Toyota Mark X GRX120 (or similar)
    The rear sump setup is a nightmare though, as is overall height with the standard sump if you dont want to chop the bonnet.


     

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