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Thread: LS7 build done

  1. #16
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    Quote Originally Posted by Hib Halverson View Post
    "Z Wiz" is right.

    An LS7 on 15 PSI is a potential disaster waiting to happen.

    There are two main reasons a supercharger, especially one with that much boost, is problematic on an LS7.

    1) The cylinder walls are too thin. That's the main reason GM did not use the LS7 case for the LS9
    2) The compression ratio is too high. To keep the engine out of detonation is going to require either a very retarded spark schedule or racing gasoline.

    The only way to make an LS7 with a Procharger durable for a reasonable amount of time is not drive it under high boost.

    No doubt, you're going to move ahead with this project regardless of our comments so, let me offer a few last suggestion:
    Make damn sure whomever you have calibrate the engine controls understands the potential detonation problem and knows how to address it. Start with 100-oct unleaded racing gas in the tank, then back down the octane to pump gas as the calibrator reworks the spark schedule. The retarded spark will have the engine running hot so make sure your cooling system is appropriately modified.
    ERL Superdeck 1 is a 6 bolt truss for strengthening the LS7 block which also allows the use of thicker ductile iron sleeves, Seems to me with the use of their technology you can achieve a numbers matching 427 (like a resto-mod) with very high levels of boost. Normally I would agree; but I've been checking this out as it allows you to resleeve your stock LS7 block . The ductile iron sleeves allow much hgher levels of boost (30 psi) as they have like 110,000 psi tensile strength.
    their verbiage:

    The ERL SUPERDECK I 6 bolt takes our SUPERDECK I 4 bolt system to the next level for extreme applications. The addition of two head bolt bosses per cylinder creates a block that is specifically designed to handle extremely high boost or nitrous. Our SUPERDECK I 6 bolt blocks have run successfully with over 30psi of boost and over 1500HP. The truss design of the ERL SUPERDECK I adds unmatched strength and stability to the bock and deck surface. The truss design (shown in the pictures above) involves connecting each pair of head bolts through an aluminum truss. This truss allows the load to be shared across the deck surface minimizing deck deflection. This allows a thinner deck section to outperform the much thicker decks. The SUPERDECK I system also allows for larger bores than dry sleeves. The ERL SUPERDECK I is available as a 443CI engine with a 4.200” bore and 4.000” stroke. The sleeve has a 25% greater wall thickness at a 4.200” bore than the others have with a 4.125” bore. ERL has incorporated the superior stability of the deck with optional ” head studs to provide uniform clamping over the entire gasket surface. A clamping force of nearly 80,000 pounds is provided by the 1/2” studs to reduce the potential of lifting the head. Traditional aftermarket Race Blocks increase deck thickness and reduce water access to the deck to aid in head gasket retention. The SUPERDECK I does not restrict water access to the deck surface. In fact the SUPERDECK I extends the water cavity floor and emphasizes upper cylinder cooling through the trusses which are short-poured. This lowers the potential for detonation caused by hot spot in the combustion chamber. An additional advantage of the truss system is that it ties the main saddles in the block to the deck. This greatly increases the strength of the main saddles by changing the load path.


    check out these articles
    GM LS Superdeck I 6 Bolt Block

    2006 Corvette - Dynos Beware - Vette Magazine

  2. #17
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    Quote Originally Posted by Hib Halverson View Post
    "Z Wiz" is right.

    An LS7 on 15 PSI is a potential disaster waiting to happen.

    There are two main reasons a supercharger, especially one with that much boost, is problematic on an LS7.

    1) The cylinder walls are too thin. That's the main reason GM did not use the LS7 case for the LS9
    2) The compression ratio is too high. To keep the engine out of detonation is going to require either a very retarded spark schedule or racing gasoline.

    The only way to make an LS7 with a Procharger durable for a reasonable amount of time is not drive it under high boost.

    No doubt, you're going to move ahead with this project regardless of our comments so, let me offer a few last suggestion:
    Make damn sure whomever you have calibrate the engine controls understands the potential detonation problem and knows how to address it. Start with 100-oct unleaded racing gas in the tank, then back down the octane to pump gas as the calibrator reworks the spark schedule. The retarded spark will have the engine running hot so make sure your cooling system is appropriately modified.
    ERL Superdeck 1 is a 6 bolt truss for strengthening the LS7 block which also allows the use of thicker ductile iron sleeves, Seems to me with the use of their technology you can achieve a numbers matching 427 (like a resto-mod) with very high levels of boost. Normally I would agree; but I've been checking this out as it allows you to resleeve your stock LS7 block . The ductile iron sleeves allow much hgher levels of boost as they have like 110,000 psi tensile strength.


    ERL's verbiage:

    The ERL SUPERDECK I 6 bolt takes our SUPERDECK I 4 bolt system to the next level for extreme applications. The addition of two head bolt bosses per cylinder creates a block that is specifically designed to handle extremely high boost or nitrous. Our SUPERDECK I 6 bolt blocks have run successfully with over 30psi of boost and over 1500HP. The truss design of the ERL SUPERDECK I adds unmatched strength and stability to the bock and deck surface. The truss design (shown in the pictures above) involves connecting each pair of head bolts through an aluminum truss. This truss allows the load to be shared across the deck surface minimizing deck deflection. This allows a thinner deck section to outperform the much thicker decks. The SUPERDECK I system also allows for larger bores than dry sleeves. The ERL SUPERDECK I is available as a 443CI engine with a 4.200 bore and 4.000 stroke. The sleeve has a 25% greater wall thickness at a 4.200 bore than the others have with a 4.125 bore. ERL has incorporated the superior stability of the deck with optional head studs to provide uniform clamping over the entire gasket surface. A clamping force of nearly 80,000 pounds is provided by the 1/2 studs to reduce the potential of lifting the head. Traditional aftermarket Race Blocks increase deck thickness and reduce water access to the deck to aid in head gasket retention. The SUPERDECK I does not restrict water access to the deck surface. In fact the SUPERDECK I extends the water cavity floor and emphasizes upper cylinder cooling through the trusses which are short-poured. This lowers the potential for detonation caused by hot spot in the combustion chamber. An additional advantage of the truss system is that it ties the main saddles in the block to the deck. This greatly increases the strength of the main saddles by changing the load path.


    check out these articles
    GM LS Superdeck I 6 Bolt Block

    2006 Corvette - Dynos Beware - Vette Magazine

  3. #18
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    Default ls7 f1c build

    When weather improves i will get final tune,now that break in is done. The stock pulley setup with the F1c i'am told is 10 lbs. Also Cry02 intercooler chiller will be finished. I spared no expense with this build. My only concern is traction. When i get dynoed i will post video like i did on vette tube after first build. Wheels and tires are next Any suggestions Thanks. Dan

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