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3.4 DOHC Stroker Motor

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  • #1

    3.4 DOHC Stroker Motor

    Got your attention with that topic. HEHE
    I was looking through a GMPerformance part catalog. When I noticed Ecotec rods have a 5.888 lenth and a 1.888 rod bearing diameter. Does anyone know the rod thickness for the ecotec rods.
    1997 Z34 Monte,: testing 4 exh cam\'s, RSM STB, K&N, Eagle077 245/40/ZR18 Nitto Extreme
    1972 3/4 ton 4X4 longbed, built 350, 400 auto, 6\" spring lift, 35\" AT/BFG\'s, dana 60 front axle, 14 bolt gm w/detroit locker 4.56 gears. My ricer smasher
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  • #2
    RE: 3.4 DOHC Stroker Motor

    No I dont, but that wouldn't change your stroke. Why not use 6" rods with custom pistons, since you will need custom pistons anyway. 6" pink rods or crower custom rods would be the route to go IMO.
    Ben
    60DegreeV6.com
    WOT-Tech.com

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    • #3
      RE: 3.4 DOHC Stroker Motor

      ya for longer strokes, you would need shorter rods and/or custom pistons in conjunction with an offset grind on your crank or something.
      The Official Rotating Mass Nazi

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      • #4
        RE: 3.4 DOHC Stroker Motor

        The Ecotec rod width on the big end is .943

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        • #5
          The reason it caught my attention was the smaller rod bearing size. It would allow you to offset grind the crank. To get additional stroke.
          1997 Z34 Monte,: testing 4 exh cam\'s, RSM STB, K&N, Eagle077 245/40/ZR18 Nitto Extreme
          1972 3/4 ton 4X4 longbed, built 350, 400 auto, 6\" spring lift, 35\" AT/BFG\'s, dana 60 front axle, 14 bolt gm w/detroit locker 4.56 gears. My ricer smasher

          Comment

          • #6
            All the aftermarket companies make smaller journal rods for the SBC, in sizes from 5.7 to 6.3 inches. You can custom-tailor your rod to stroke ratio with any of them.

            We took a 1969 Pontiac OHC motor (Inline 6) and stroked it by 1/4 inch (over 6mm) while at the same time lengthened the rod by .200 (over the stock rod length) to try keeping the factory rod/stroke ratio.

            There's no reason you can't do the same thing with the LQ1. The off-the shelf rod set we used runs about $500 per set and needs about another $100 worth of grinding (to set the width of the big end). The rod bearing diameter is 1.770" The crank needs to be offset-ground (@ ~$300). Custom pistons and rings will cost about $600 for the set.

            We didn't look into doing this in the LQ1 block, but I imagine there's not much that would be needed to get it right. You might have to clearance the block to clear the rod bolts slightly - I have no idea.

            Rods: $500
            Rod Mods: $100
            Custom Pistons & Rings: $600
            Offset-Grinding your crank: $300
            Adding 16 cubic inches to your LQ1: Priceless

            By the way, the final stroke of 3.557 (90.4mm) almost makes the motor square.

            Q

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