The displacement increase is the product of a special crankshaft with longer stroke, precision - balanced piston rods, larger - diameter pistons and corresponding
larger cylinder bore.
Yes, the engine is slightly smaller in displacement — two litres versus 2.5 in the S; same stroke,
larger cylinder bore — the base cars aren't down that much on usable power.
Not exact matches
In order to maintain the same in -
cylinder displacement a smaller
bore will require a
larger stroke, so the distance between top - dead - center (TDC) and bottom - dead - center (BDC) will be
larger.
The bias is determined more by the diameter of the master
cylinder bore and the size of the caliper piston sizes, front and rear, front being
larger, rear smaller.
Traffic regulations in a
large number of countries require trucks to always drive with an engaged gear, which in turn provides a certain amount of engine braking (viscous losses to the engine oil and air pumped through the engine and friction losses to the
cylinder walls and
bearings) when no accelerator pedal is applied.
And while the
cylinder heads, intake system and dry - sump oiling system are stock LS7 components, the engine — which has
larger bore and stroke dimensions than the 7.0 L (427 - cubic - inch) LS7 — uses a one - off reciprocating assembly, including a forged steel crankshaft, forged rods and forged pistons.
Performance is more than adequate, with appropriately
large brakes to haul it down with authority and improved pedal feel thanks to a dual -
bore master
cylinder.
The secret hidden under its bonnet is a heavily revised version of the twin - turbo V8 engine from the S63 AMG Coupe, fitted with a special crankshaft with longer stroke, as well as an enlarged
cylinder bore and correspondingly
larger forged pistons.
The LS7 uses a unique
cylinder block casting with pressed - in steel
cylinder liners to accommodate the engine's
large, 4.125 - inch
cylinder bores — with deck - plate
boring and honing for optimized
bore geometry.
Plasma coated
cylinder liners, a central oil supply through the crankshaft with
larger bearing diameters,
larger connecting rod
bearings and the rigid valve train with shims to provide valve clearance compensation all carry over from the 2018 911 GT3.