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  1. #1
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    Motor Build help

    Im currently building an S54 for boost.

    Option 1:

    Cp pistons, 87.5mm bore 9.5:1
    Eagle rods
    Arp head studs
    arp rod bolts
    new OEM bearings and big ends
    Vac head gasket

    Option 2:

    Cp pistons 85mm/86mm bore 9.5:1
    Darton/vac sleeves
    Eagle rods
    Arp head studs
    arp rod bolts
    new OEM bearings and big ends
    Vac head gasket


    My mechanic is convinced that with the 87.5mm bore, my motor will not handle boost, even at 9psi he says that I will run into problems. He recommends option 2. Now I understand that sleeving and going with a smaller bore I will be able to run much higher boost, but will the motor handle 9psi with option 1?

    I already have all the components for option 1 and I want to oring the block as well.

    I am in South Africa and our fuel here is rubbish, plz keep this in mind.

    TIA!

  2. #2
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    Your tuner is dumb. Option 1 seems fine. I'd bump the c/r up a bit and do 10.5:1 or whatever around there is offered.
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  3. #3
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    With option 1, What sort of boost will the motor be able to handle?

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    First question,which charger do you plan to use?

    option 1 handles easy 9psi boost reliable all day long(although will trade off due to the low CR mid range/low end performance).
    MLS headgasket is good enough for these boost levels,although you should get in touch with PPF in Sweden if they offer cooper ring gaskets for the S54.

    And get proper rods,not the Eagle junk,please!

    I would also consider to get from VAC the ATI vibration damper for the crank.

    Of course crank,rods,pistons balanced.

    Porting the head makes sense,will drop the boost level slightly but gains power on a s/c application.

  5. #5
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    I have a garrett gtx3582r, motor being built for turbo, not sc

  6. #6
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    Click here to enlarge Originally Posted by PotatoHeaD Click here to enlarge
    I have a garrett gtx3582r, motor being built for turbo, not sc
    OK.

    No need porting heads then...

    My other recommendations are still valid,though

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    Cool thanks!

  8. #8
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    Click here to enlarge Originally Posted by S62R Click here to enlarge
    First question,which charger do you plan to use?

    option 1 handles easy 9psi boost reliable all day long(although will trade off due to the low CR mid range/low end performance).
    MLS headgasket is good enough for these boost levels,although you should get in touch with PPF in Sweden if they offer cooper ring gaskets for the S54.

    And get proper rods,not the Eagle junk,please!

    I would also consider to get from VAC the ATI vibration damper for the crank.

    Of course crank,rods,pistons balanced.

    Porting the head makes sense,will drop the boost level slightly but gains power on a s/c application.
    This guy seems to build a lot of M motors. Just saying...
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    Click here to enlarge Originally Posted by PotatoHeaD Click here to enlarge
    I have a garrett gtx3582r, motor being built for turbo, not sc
    You will want to run more than 9psi with that turbo :-) What are your power goals?

  10. #10
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    At the moment, 400 - 500hp

  11. #11
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    Click here to enlarge Originally Posted by Mike@VAC Click here to enlarge
    You will want to run more than 9psi with that turbo :-) What are your power goals?
    Was gonna say the same thing lol...
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