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Turbo Compression question

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    #1

    Turbo Compression question

    What exactly is your "compresion" in regards to turbo. I know it has somthing to do with the pressure in the cylinder, but other than that i know you want low comp for turbo and hi comp for N/A. What is it and how do I change it and what does this effect?
    I dont know if it matters but I am asking specificly because I plan on turbo'n an H22 (yes I know it has composit alloy, I am going to have all the nessicary work done so lets not make this about the merits of F/I'n a H22)
    Thanks in advance
    Tags: None
    #2
    When people are talking about compression in regards of a turbo its more about safety for the engine. In an average turbo build you want low compression (low pressure) because the air fuel mixture wont ignite as easily. Compression is usually changed by using different pistons. You will need a proper tune to make any turbo car run right. Just some basics

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      #3
      the frm sleeves in the h22 (i assume you are referring to this when you say composite alloy) are only a drawback because they limit the choice of aftermarket pistons. you need to change the pistons to change the compression, though it can be done with the head as well. and by using a thicker head gasket but thats a bad way to to it.

      you dont HAVE to lower compression to boost. you just give yourself a much smaller margin of error. with high compression and boost a bad tune will grenade your engine very fast

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        #4
        Originally posted by Jonas View Post
        the frm sleeves in the h22 (i assume you are referring to this when you say composite alloy)

        you dont HAVE to lower compression to boost. you just give yourself a much smaller margin of error. with high compression and boost a bad tune will grenade your engine very fast
        Yes the "FRM" sleeves is what i was talking about just didint know what there were called. Also yes this is why I was asking the questions, I have a brand new (08 Scion XD) car that I use for my daily, gets me to work and picks up my groceries. I was asking for the "how to" on doing it the right way. If I change the piston do i need to change the conecting rod?

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          #5
          When you are re-building motor you want to replace as may moving parts as you can, considering they are over 15 year old. Once you spend 3 grand on rebuild motor do you realy want that connection rod jornal bearing to fail and destroy your motor. If you are plan to make power with boosted H, you need to cylinder re-sleeve your block, low compression pistons, eagle rods, replase main bearings and for the head, port-polish, 3-5 angle valve jod, stronger valve springs and retainers. There is whole lot more that you can do with it, check out some forums to get more ideas on it.
          http://www.honda-tech.com/forumdisplay.php?f=16
          http://www.homemadeturbo.com/forum/
          Last edited by keycb7; 12-09-2008, 09:13 PM.

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            #6
            most aftermarket pistons wont work with stock rods anyway. not as far as i know anyway. basically what you want to do to do it right is this. replace rods, pistons, rings, bearings ,seals and everything else you can on the bottom end. the frm sleeves are strong but dont work with many pistons. getting it sleeved by darton or golden eagle is the best bet. the crank should be given to a machine shop to make sure its properly balanced. many people modify the crank. i wouldnt but thats just me.

            you dont really need to do anything to the head for turbo until you get to crazy levels. just make sure the parts can handle the heat.


            most importantly your going to need a good turbo setup and a good tune.

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