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b16a2.....what pistons for what im doing?

Discussion in 'Engine Building' started by 98b16a2, Jul 2, 2007.

  1. 98b16a2

    98b16a2 New Member

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    I'm currently building a turbo'd b16a2 engine. I have it bored out to +.020. The turbo itself is a t3/t4 with the specs of a/r.50 a/r.63. I'm using a stock head with a skunk2 intake manifold and a higher flow fuel system (not sure what throttle body, fuel rail, injectors I'm using yet but there will be better ones than stock in)

    I'm not sure what pistons to use. They are going to be the srp ones with eagle rods, but should I go with the 8.2:1 or the 8.0:1? Is there going to be a big difference? I'm worried about the time it'll take for the spool up on that turbo....if there is a spool a time to be worried about that is.

    Thanks
     
  2. dtob

    dtob New Member

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    I'd go with the 8.2:1 if its a street car. It will keep your off boost power a little higher than the 8.0:1. Not really by much but it will be a little better. If I was building a turboed street car I'd get with about 9.0:1 but its up to you and what you want to do. Also depends on the boost you want to run.
     
  3. jamesA

    jamesA Well known pissed off telephone guy VIP

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    I thought you were supposed to bore/hone the block to the specs of the pistons you should already have... not the other way around.
     
  4. 98b16a2

    98b16a2 New Member

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    You can bore out to what you have but I'm still not sure what ratio I'm going with, but I am sure that I am getting SRP pistons, and I also know that they offer all of their different compression ratio pistons up to a +.020. So that's why I went ahead and got the bore out of the way, that's the constant I'm sure of.
     
  5. jamesA

    jamesA Well known pissed off telephone guy VIP

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    Build an 8.5:1-9:1 engine. it'll be semi decent if you ever have to drive the car around without the turbo (say you blow the compressor fins).

    As far as the TB, buy a stock b16 one and have it bored/honed out.
     
  6. 98b16a2

    98b16a2 New Member

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    Well, atleast I know that now. I would have figured if they said it was +.020 over, that thats what it would be. Hopefully when they are purchased, I'll take the block down with the pistons and see how close/screwed I am lol.

    Thank you for the insight.

     
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