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Purists state the only engine that belongs in a Hachi is the sixteen-valve. Slightly left leaning folk will grab pistons out of the AE92 for the 10.3 compression ratio. Even further left leaning people will scrap the sixteen-valve completely for the AE111, quad-throttle from the latest FF Levin. Coming from the camp that is trying to put a F20 into his personal Hachi, I call the 4A-GLEU swap the happy middle.
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Installing a twenty valve is quite commonplace in the AE86 world. In doing so Tajima also installed Toda 264 duration cams, a TRD 0.8mm head-gasket, Toda gears and high strength timing belt, and Impulse’s own 70mm intake trumpets and 4-2-1 header. Also added to the list are a CBY Titanium exhaust, a Sard high flow catalytic, Samco plumbing, and Impulse’s own low resistance pulleys.
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| Habuchi specified a factory fresh twenty-valve engine, a hefty investment. |
What’s not commonplace on this engine (and the whole car) is the lack of beater-car ethos seen rampant in the Corolla society. In calling some engine importers a twenty-valve sells for $2000 used. Habuchi bought his new from factory. To protect this hefty investment a number of cooling upgrades have been made, including a Trust sixteen-row oil cooler, a Toyota 76.5C thermostat, an Impulse oil catch can, and a Yashio Factory (Top Fuel) radiator.
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| Impulse's own 70 mm intake trumpets and 4-2-1 header are seen here in the immaculate engine bay. |
The flow of electrons through Tajima’s custom wire harness, Trust racing spark plugs, and Okada Project ignition coils is orchestrated by an E&E Freedom ECU. This all nets an estimated 180HP at 8000 RPM; more than enough for a car that weighs 2000 lbs.
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