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Hot!Wiseco or Cp Pistons for a 3sgte?

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92 Hard Top
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2018/11/09 11:30:07 (permalink)
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Wiseco or Cp Pistons for a 3sgte?

Have to buy 86.5mm Pistons. CP Pistons seem to be about $180 US more, is it worth it? Car is only a Street and sometime at the track not a circuit car.
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    TonyMR2
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    Re: Wiseco or Cp Pistons for a 3sgte? 2018/11/09 15:16:58 (permalink)
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    Why do you have to buy new pistons oversized? Engine had low compression and your rebuilding?

    Individual circumstances so this may not apply. Just asking because I had a great engine, 180 each cylinder, pulled apart for going mls head gasket and chatting with a machine shop - they offered me free advice on the block told me needs to be bored/honed out to oversized, new everything etc, and it simply wasn’t the case. Talking to a machine shop is asking for them to sell you what they do. Time is money and nothing leads to nothing.

    Forged pistons is known to take more abuse than stock materials. With the other costs of rebuilding an engine, forged pistons are a good investment as its small in the overall costs. Using a brand name does not say one is better than the other, as many brands have different series.
    “Forged” materials vary in what is used by each manufacture and within a series from the same manufacture, and forms a hp rating. Some forged have a strength to a maximum of day 400hp and others to 1000hp. You will find that some pistons are 350grams per piston and others 250grams per piston.

    My ATS Racing Weisco Stage 3 pistons are $145 usd more than stage 1, rated at 1000hp than 400hp, in comparison to cp they are less than 3/4 the weight (massive weight saving) polished to a finish hugely superior to the other, wrist pin massively thicker and worth the investment, however I evaluated total costs and the what if in the future.

    In your situation, see if anyone has used forged pistons in good condition - put up a want to buy - think someone had some for sale. Or measure it yourself / someone you can trust and get an oversized rings (depends on your block).

    Your choice on forged pistons - read into what you are getting, look around for suppliers as different prices greatly for the same item.

    Personally, if you have a stand-alone ecu and rebuilding then go 5sgte not 3sgte. But that’s a different conversation.
    #2
    Falcon
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    Re: Wiseco or Cp Pistons for a 3sgte? 2018/11/10 15:34:10 (permalink)
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    I wouldn't know about costs or if it's worth it but.
    Wiseco at 86.5 are about 65 grams heavier than the equivalent CP piston. That is both with gudgeon pins, circlips and rings. CP uses a shorter gudgeon pin. CP is about 2 mm shorter in its skirt thrust area and is about 3 mm thinner in its crown. Both have very nice design and beautiful machining. Personally I think the crown top surface design of the wiseco is maybe minutely better ? Maybe ?
    Rob K. and his tuner I believe got in excess of 370 kw. at the wheels and it was slipping on the rollers so CP pistons can't be too bad. Sometime later it ended up breaking the main bearing caps so once again CP pistons can't be too shabby.
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    TonyMR2
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    Re: Wiseco or Cp Pistons for a 3sgte? 2018/11/10 18:32:40 (permalink)
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    Did you record the total weights of the CP and Wiseco in 3sgte 86.5mm? Would be eager to know.

    In my comparisons have been to 5s stroker 87.5mm in the stage 3 series for extreme stupidity over 1,000 hp, huge differences in structure of the piston and HD pin (incredibly thick). Wiseco 5sgte stage 3 248.2 grams each piston or 336.1 grams complete.

    A mate has the CP 5s stroker 87.5mm etc etc, thinner wrist pin, and was 449.5 grams complete.
    #4
    5SGTE
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    Re: Wiseco or Cp Pistons for a 3sgte? 2018/11/11 08:56:27 (permalink)
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    I've got wiseco in my 5s build. I like that the skirts are coated and they have some ridges between ( kinda like small ripples around the circumference ) the ring lands and piston crown that are supposed to reduce that area as a source of pre ignition.

    Either way I reckon they'll both be up the task.
    #5
    Falcon
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    Re: Wiseco or Cp Pistons for a 3sgte? 2018/11/12 07:25:45 (permalink)
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    Tony. I've always weighed pistons complete with gudgeon pin, circlips and rings as just a bare piston weight doesn't really have a lot of meaning. The whole thing reciprocates. There's a formula that apportions part of the rod weight to the reciprocating weight also. But I've long since forgotten that. That's for blokes that do balance work to figure out.
     86.5 - rings, gudgeon pin, circlips.
    Wiseco - 515 grams.
    CP - 450 grams.
    My ba****ds must be cast iron version !
    Kris. You might want to pull em out and take a look what's happened to the coating.
    #6
    Mrskylighter
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    Re: Wiseco or Cp Pistons for a 3sgte? 2018/11/12 08:53:27 (permalink)
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    I used CP pistons in my stroker 3s build 10 years ago and they were fine. 316KW to the wheels on 98 fuel and around 20psi. Apparently the engine is still going strong today.
     
    I went with the CP 3S stroker pistons (SC7452) designed to be used with 3S rods and 5s crank in a 3S block. 5s crank needs to be turned down to accept the 3s rods though.
     
    Spec sheet below with weights etc from 2008. May or may not have changed since.
     
     

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    1989 AW11 Gen3 3sgte
    #7
    92 Hard Top
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    Re: Wiseco or Cp Pistons for a 3sgte? 2018/11/13 15:44:37 (permalink)
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    Thanks for the info Help.
    Made a decision Wiseco won. $200AUD cheaper. They on there way. I think they will be perfect for my engine build.
    #8
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