Accelerate
'til you see GOD,
then brake.
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Stage Four
Harley-Davidson engines are "anything goes". This 137 horsepower 89 CID XL
engine with a NOS nitrous oxide system is an excellent example of a "low cost"
Stage 4 engine.Stage Four Engine Specifications
Year:
Model: XL
Bore: 3.62"
Stroke: 4.32"
Displacement: 89 CID
Cases: H-D
Assembly: James Reeder
Crankshaft and Flywheel: H-D
Heads: H-D
Intake Valves:
Exhaust Valves:
Valve Springs:
Porting:
Compression Ratio:
Pistons:
Cam: Andrews N83
Pushrods:
Carb: Mikuni HSR-45
Carb Jetting Information:
Manifold:
Air Cleaner:
Ignition:
Ignition Timing:
Coil:
Pipes:
Nitrous Oxide system by NOS with 28 nitrous/32 gas jets.
Dyno Tuning Facilities:
Tuning notes:
Using the NOS jets 28 nitrous-32 gas combo I had trouble
getting consistent results. I replaced the fuel filter, cleaned out the nitrous filter,
even tried another nitrous solenoid. I finally tried another relay and it seems to be OK
now. I lowered the jets to 20 - 24 to be a little more manageable.(around 30 hp)
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