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G15 Technical Guide - Engine & tuning
The standard engine is one of the Imp variants (typically 875cc Imp Sport, 930cc or 998cc) and in standard form is covered in Imp workshop manuals. What follows are notes and datasheets compiled over years of preparing and racing G15s.
Camshafts • ARP rod bolt fitting
Twin 40 DCOE Installations: The standard Webber linkage fits on top of the forward carb.
A tidy engine bay with several of the mods described in the Guide.
G15 Technical Guide - Gearbox and transmission
The standard gearbox and transmission is all Imp and in standard form is covered in Imp workshop manuals.
Gear Ratio/Speed in Gear Charts
Rotoflex Couplings: For competition use Lotus Elan ones with cap head high tension bolts and shallow Nyloc nuts.
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