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Sudden

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Posts posted by Sudden

  1. The "4e-f" (carburetted 4e) distributor has weights on the shaft like a traditional carb motor, with a vacuum advance and a built in igniter setup with the coil... Its basically an efi distributor but with mechanical advance instead of ecu controlled timing. The 2 pin distributor plug is the same, and the only one necessary.

    Bike carbs are more expensive and tedious than efi.

    I ran mikuni bs36 (yamaha fj1100) bike carbs on my 4e-f motor for a while, mated perfectly to a cut tubular intake manifold. Was part one of my experiment to prove the efficiency capabilities of constant velocity slides with individual throttles. But the needle that meters the fuel worr into the emulsion tubes causing them to run like garbage aftet a time, and the cost of replacement parts for the carbs came to over 80usd for each slide, and over $1000usd for a set of new/refurbished carbs. I Purchased 04 yamaha r6 itbs with injectors, tps, map sensor and harness for $19 usd. Fuel injection, retaining the constant velocity slide application to continue my project.

    IG @c.n.a.b. for picture documentation and any questions.

  2. Take your time shifting and you'll be fine. Selector forks and shafts, can be iffy. Gear width won't brother you till you are putting down lots of torque throughout decent tyres. N/A boxes have final drive ratios ranging from 4.312, 3.546 and there maybe a 3.700( labeling key changed between 95-96 starlets and tercels, so difficult to say for certain.

  3. Displacement, compression, air, fuel. No fun without good gear ratios though.

    My setup is a 5efe block (skinny rods), with 4efe pistons, a usdm 5efe 0.6mm metal head gasket. Shaved 4e-f/4efte head (stronger valve springs), 5efhe cams timed to the 4e mark( aftermarket cams are too expensive where i'm located). 5efhe header and full piping, minus the cat(replaced with an oval 2inch resonator. Yamaha R6 itbs from the early efi model. Megasquirt 1 ems. C150 -672 (3.546diff) gearbox removed and replaced with a C150 -642 (4.312diff).

    What I would do differently if/when I rebuild:

    Blueprinted and balanced rotating assembly with forged rods, custom forged pistons to match the 4efe stock piston, but with deeper valve reliefs, ported and polished head (preferably uncut), higher duration/lift cams and uprated valve springs, custom header. Methanol injection.

    In all honesty this build would be a waste of time for anyone who isn't fully dedicated to seeing it through. Such dedication cannot be found if peak hp numbers are an end goal.

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