My Mitsubishi 4G15P 's carburetor's inlet*manifold is
joined with hot water's exit from cylinder head : this design
( esp in cold climate <10°C ) enables * to heat up fast to 40
°C ( ideal temperature for air to receive petrol vapour, per
www.turborick.com/gsxr1127/gasoline.html para 10.2[7] )
but here in e.g. 28°C ambient air, hot water overheats *.
I added cooling ( 2 aluminium dishes with water ) to
thermostat's cover, significantly reduced *'s heat, got more
torque ( as hoped ) + a surprising big drop in exhaust noise.
I wonder what made exhaust noise drop : if a drop in air intake
temperature cannot cause this drop in noise, then the only
possible cause is that distributor ( with transformer coil inside
) & alternator are cooler & so produce more amps & so bigger
sparks. Does any1 here know better ?
