My latest Rover build - 293cu

Discussion in 'Small Block Tech' started by Rossco, Apr 16, 2017.

  1. Rossco

    Rossco Greetings Earth Creatures

    For the last 8 months I've been working on a stroker Rover based on the later 4.6 engine.

    Spec is:

    Standard bore x-bolted block.
    4.6 crank offset ground for 3.4" stroke.
    Diamond forged pistons
    Lunati H-Beam SBC rods narrowed to fit and rebushed to 0.866"
    Crower 50305 cam
    TA heads
    TA Roller Rockers
    Rotrex supercharger.
    Fuelling and ignition are being dealt with by Megasquirt.

    We are about a week away from firing up for the first time and once its broken in we'll have it on the dyno. We're hoping for 500bhp.

    I'll post pictures if anyone is interested.


    Last edited: Apr 17, 2017
  2. sean Buick 76

    sean Buick 76 Buick Nut Staff Member

    Very cool! YES pics!
  3. 300sbb_overkill

    300sbb_overkill WWG1WGA. MAGA

    Sweet! That's a lot of horsys For that size CID!!

    Can you tell us more about your build? Heads(what kind of porting was done?), cam(so I don't have to look it up, can you post the specs or a link?), intake? What kind of RPM you gonna spin that thing to so it'll make that kind of power? How much boost will it need? Sounds like a VERY cool project, would love to read more about it. Thanks in advance.

    And hell yeah, post some pictures!!

    Last edited: Apr 16, 2017
  4. Rossco

    Rossco Greetings Earth Creatures

  5. Rossco

    Rossco Greetings Earth Creatures

    Cam specs are:

    Part Number 50305

    Engine Make Buick
    Year 1961-1967
    Part Class Camshaft
    Camshaft Name Compu-Pro
    Camshaft Series Compu-Pro
    Engine Type V8
    Engine Size 215, 300 & 340
    Product Type Mechanical Flat Tappet
    Valve Lash .022" intake and .024" exhaust
    Lobe center 108
    Advertised Duration: Intake / Exhaust 304 / 310
    Duration @ .050" Lift: Intake / Exhaust 256 / 262
    Lobe Lift: Intake / Exhaust .335 / .343
    Rocker Ratio: Intake / Exhaust 1.6 / 1.6
    Gross Valve Lift: Intake / Exhaust .536 / .549

    The engine will regularly see 7000 rpm

    Boost will be around 14psi but given the limitations of the induction system we will be developing a new inlet system later in the year. We will also be looking to do some porting work on the heads at that time as well.
    CoopsV8 and 300sbb_overkill like this.
  6. sean Buick 76

    sean Buick 76 Buick Nut Staff Member

    WOW, super nice project!!! What length rod and what compression height on the pistons? I have two 350s with Diamond pistons, they are very good....

    Your build is the most serious I have seen of its type!!! What vehicle is it going in?
    CoopsV8 likes this.
  7. Opel GS

    Opel GS Dream Up

    Very sweet! Something like this would go well in the wife's MG
    CoopsV8 likes this.
  8. CoopsV8

    CoopsV8 Member

    This beast is living under the bonnet of my mk3 Ford Capri (UK spec)
    Sorry to hijack your thread Rossco
  9. Moyock13

    Moyock13 Well-Known Member

    Heck, Opel GS! That would be sweet in the Opel!

    If you dyno the motor, could you provide the dyno sheet? Sweet, thanks!
    Opel GS likes this.
  10. Rossco

    Rossco Greetings Earth Creatures


    CoopsV8 likes this.
  11. Rossco

    Rossco Greetings Earth Creatures

  12. Moyock13

    Moyock13 Well-Known Member

    Rossco, I'm speechless! Is the EFI stock Rover?
  13. CoopsV8

    CoopsV8 Member

    I can answer this one. Lol
    It's a stock plenum with 44mm trumpet Base and I've ported/blended the hot wire manifold Base to suit. There's a Thermal spacer between the trumpet Base and lower manifold.
    412cc jenvey pencil injectors all run via a megasquirt ms2 ecu.
  14. Moyock13

    Moyock13 Well-Known Member

    I'm simply amazed!!! Horse power?
  15. CoopsV8

    CoopsV8 Member

    The old setup was 404rwhp this one's a lot lot more after the little road test yesterday
    Off for mapping in, June with Rossco
  16. Skippy597

    Skippy597 Silver Level contributor

    Wow! This is an amazing build! I love the fact it is going in a Capri I always liked those but haven't seen too many of them. Keep us updated.

    CoopsV8 likes this.
  17. Rossco

    Rossco Greetings Earth Creatures


    We are on the rolling road for mapping on the 12th June.

    I'll post the dyno sheet on the Monday evening.
  18. Rossco

    Rossco Greetings Earth Creatures

    Well that was a day of ups and downs.

    Arrived at the rolling road around 9:30 and soon found that the MAP sensor was only reading 75kpa. Swapped out for a new sensor and got the same reading. We also noted that a few of the gauges on the laptop were not stable but were flickering slightly. After a quick discussion we opted for a new MS2 ECU. Of course the only one available was set up for a four cylinder engine, so out with the soldering iron.

    Our tech (Dale @ Bailey Performance) set about mapping the engine and before long he was giving it some serious abuse up to 6500rpm, slightly short of the redline of 7000rpm. The engine performed faultlessly which unfortunately cant be said of other things.

    First glitch was a broken clutch cable......fixed, or rather bodged. It did fail again and that's when we called it a day.

    Second glitch is not so simple. The previous engine made 404rwhp @12psi. The new engine has an enormous appetite for O2, so much so that we couldn't get more than 3psi on the gauge.

    We had thought the charger could be marginal but given there are no leaks anywhere we were surprised to see so little boost. Anyhow the hunt is now on for a centrifugal supercharger capable of feeding this engine with O2.

    Watch next week for the next exciting episode............
  19. sean Buick 76

    sean Buick 76 Buick Nut Staff Member

    Looking forward to hearing how this works out!! Very cool! Have you considered a turbo?
    CoopsV8 likes this.
  20. CoopsV8

    CoopsV8 Member

    Funny enough I have talked with Rossco earlier this year regarding turbo('s)
    Gutted we didn't get the. Numbers yesterday we were hoping BUT. This is going to be an awesome engine once we can get some boost into it.
    Has a Very crisp throttle response.
    I know we had issues but in The long run. I'm. Over the moon with our engine

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