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In this section we'll reveal João Pinto's nephew, Luís Agostinho Metrakit 70cc Mini GP powered by LuFo.
He'll be riding this Metrakit 70cc GP on the Metrakit Trophy in Portugal, the engine was tuned by LuFo to be competitive and reach the championship title this year.
On this Trophy, the only things allowed is to tune the engine without changing the piston stroke and diameter, so the only things tunnable are:
 Cylinder
Exhaust system
Electric system
Transmission
Here some photos of the Metrakit 70 tuning: |
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Metrakit 70 MiniGP 15 500rpm powered by LUFO |
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The Metrakit in LuFo's workshop in the final procedures, testing the carburation for possible rejetting. |
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The instruments now above the 14 000, this engine is reving till 15 500 rpm!...and the reeds played well !! |
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One of the two exhausts LuFo made |
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The Metrakit on Santo André kart circuit for the testing procedures, a preview of the engine. |
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The two exhaust side by side, and on the right photo a detail of the 28mm carburetor without using any kind of air filter and the BITUBO rear suspension. |
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Another two photos of the engine and exhaust on the Metrakit.. |
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A detail photo of the Metrakit 70cc engine with the exhaust assembled, showing the stock flywheel, without the light support and with new ignition timing. ;) |
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The pilot of this Metrakit 70 MiniGP powered by LuFo, Luís Agostinho. |
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The Metrakit on the left photo, LuFo, João and Jorge on the right photo. |
Engine maximum rotation in charge: 15 500 RPM.
Estimated power: 25 - 28 engine hp
Maximum Real Speed: 170 km/h (circuit) & 130 km/h (kart circuit)
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Piston: 47.6mm, using only one piston ring.
Stroke: 40mm.
Cylinder: Metrakit kit nicasil sleeve, modified by LuFo by changing the port timings and angles, boost ports and passages reshaped for higher gas flow.
Cylinder head: Metrakit kit, 15:1 compression ratio.
Radiator: Stock
Spark: NGK B10EG.
Reeds: Stock carbon vanes, but reinforced.
Carburetor: 28mm with new gigleur kit.
Air Filter: doesn't use any kind of air filter
Electric part: Stock, light support removed, new ignition timing by LuFo (next step, PVL / Rotor)
CDI: LuFo hand-made, with new diagram map.
Connecting-Rod: Stock.
Clutch: Stock, but reinforced.
Exhaust system: LuFo hand-made using mathematical formulas.
Silencer: Stock.
Oil: Direct mixture in the deposit, 4% using Castrol A747.
Transmission: depending on the use, normal transmission is 14 - 37 using 420 chain
Gearbox: Stock with 6 gears (next step, racing gearbox, close-ratio) |
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