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Isuzu 4JB1 N/A to Turbo

504 Views 12 Replies 5 Participants Last post by  Dougal
Would be planning to run an Isuzu 4JB1 N/A (around 80hp and 130lb/ft torque) with turbo low-boost system (just to shove air in and keep smoke and EGT down)

The Isuzu 4JB1 I'll be using is a early truck type unit (no oil cooler, 4-hole injector with square bowl piston), would not run a turbo I/P as stock N/A power level would be sufficient but needed to be efficient at 1,400-3,500rpm with my cruising RPM range from 1,500-2,600rpm at 30-60mph.

Would also need to assess whenever I need intercooling and if the vehicle needs to be regeared when necessary.

My vehicle would be an '89 Toyota Crown, with 3.91 rears, W55 tranny, 205/55R16 tires and grossing at 3,000lbs estimate.
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Keep the boost to single digits and the fuel to not smoke and you'll be fine. They're a strong engine block and that car won't be able to overload it.
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Generally speaking the industrial motors have different manifolds (top mount turbo or intake and exhaust), larger oil sump with central pickup and a larger/heavier flywheel and housing with an SAE standard pattern.
The injection pumps can be very different depending on the application. Some industrial engines only run one RPM.
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