Need advice on 3V 4.6 NA stroker build, any issues if running 10+ to 11CR?

Discussion in 'Mustang Chit Chat' started by Shakn68, Sep 28, 2020.

  1. Shakn68

    Shakn68 Junior Member

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    Getting ready to order my 5.0 stroker kit for an Aluminum 3V 4.6. I'd like to increase the CR slightly over the factory 9.8. Has anyone run a N/A 10+ up to 11CR and did it effect octane, Knock, or reliability in anyway? Currently run most bolt-on N/A mods with a tune. Please advise.
     
  2. RED09GT

    RED09GT Senior Member S197 Team Member

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    These cars can tolerate a fair bit of compression, especially N/A. If you plan on staying N/A, going up to even 11.0:1 is fine with premium fuel. If you decide to do a power adder later on, it would be best to switch to E85, if available.
     
    Last edited: Sep 28, 2020
    Shakn68 likes this.
  3. stkjock

    stkjock ---- Madmin ---- Staff Member Administrator Super Moderator S197 Team Member

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  4. Doug Huggard

    Doug Huggard Junior Member

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    Are you planning on getting a forged crank with your stroker kit? Or the cast Eagle crank? The reason I ask is because if you are staying with a cast, I'd stick with your stock crank. Going stroker with these motors is known to add very little power over stock stroke, but you will get more piston wear due to the skirt dropping pretty far out of the bore at bdc. My recommendation would be stock crank(known to be very stout), boss rods and Manley flat top pistons. This would bring your compression to about 10.5-1, be a lightweight rotating assembly which would be very responsive through the rpm range and give you a little room compression wise to run pump gas if you decide to go FI later....which everyone does eventually lol
     
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  5. Dino Dino Bambino

    Dino Dino Bambino I have a red car

    Age:
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    Here's a real world example of a N/A 302ci stroker build in a 2009 GT:

    302ci Stroker & HCI

    [​IMG]

    Combining a 3.800" stroker crankshaft with the 3.554" cylinder bore of an honed 3V block increases displacement from the stock 281ci (4601cc) to 302ci (4942cc). The compression ratio is also increased from 9.8:1 to 10.5:1 when using flat top pistons with 6.25cc valve reliefs. This stroker combination was dressed with Livernois stage 3 ported heads, XFI 127600 SPR camshafts, Livernois cam phaser limiters, FRPP intake manifold, FRPP dual 62mm throttle body, FRPP 39lb injectors, SPEC 12lb aluminum flywheel, and a
    Shaftmaster aluminum driveshaft.

    413.32rwhp 359.49rwtq (SAE corrected)
     
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  6. Shakn68

    Shakn68 Junior Member

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    Appreciate the info, TY
     
  7. Shakn68

    Shakn68 Junior Member

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    Nice build, thanks for sharing the Dyno test. Gives me something to shoot for.
     
  8. GERMANSHEPERD

    GERMANSHEPERD forum member

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    My 323 is 11.85:1 no issues anywhere. 30 is the max timing you want to run on 93. Adjust accordingly.
     
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  9. Shakn68

    Shakn68 Junior Member

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    Thank you all for the tips. I feel better moving forward.
     
  10. Dino Dino Bambino

    Dino Dino Bambino I have a red car

    Age:
    57
    1,995
    538
    Here's another real world NA stroker build in a 2008 Bullitt:

    323ci Big Bore Stroker & HCI
    [​IMG]

    Combining a 3.750" stroker crankshaft with the 3.700" cylinder bore of the FRPP Boss Modular 5.0L cast iron block increases displacement to 323ci (5286cc). This stroker combination is similar to the previous 302ci stroker combination apart from the bigger displacement and higher compression ratio.

    426.09rwhp 386.90rwtq or 473hp 426lbft (crank)

     
    2526Bullitt and Bullitt2954 like this.
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