NOTES BY MARK SMYTH ON NEXT GM V8
This clean sheet new design GM V8 engine with DOHC and twin turbocharged is only 4.2 liters.
It has 4 valves per cylinder which boasts power by at least 5 to 10 percent over a two valve cylinder of the same size.
It has a torque rating of 627 pounds feet but it will only be available in a All Wheel Drive car to reduce wheelspin and allow faster, safer cornering and faster acceleration.
At 550 HP it matches the HP of the recent GM 6.2 liter supercharged V8 in the V-Cadillac, with OHV, Over Head Valve, that has only two valves per cylinder. Interesting is that each cylinder bore size is smaller than the stroke size, with bore at 3.39 inch and crank stroke at 3.55 inch.
Compare the per liter output of the two different engines. The older supercharged 6.2 liter V8 puts out 88.71 HP per liter.
The all new design 4.2 liter twin turbo V8 in this 2019 V Sport Cadillac puts out 130.9 HP per liter.
This is an huge increase of 147 percent of the 2019 design small 4.2 liter V8 over the older tech 2 valve 6.2 liter V8 used in the past couple of years in the Caddy.
As an aside, this new design smaller GM V8 with DOHC will also be used in the next Camaro at a larger 5.5 liter size.
An even larger all new design 6.2 liter with DOHC, Double Over Head Cam and the 4 valves per cylinder, will be used in the next generation of mid/rear engine Corvette.
Both front engine and mid/rear engine Corvettes will be offered for sale next year at the same time with the next gen mid/rear engine version starting at $125,000 in the U.S. which is double the price of the front engine Corvette.
The next gen 5.5 liter DOHC turbocharged Camaro V8 has been tested at over 700 to 750 HP on the dyno. It is being built at the Tonawanda, NY GM engine foundry., according to this same website GM AUTHORITY dot com.
This new engine is a narrow V design, with the twin turbos on top, so it can easily be swapped into smaller vehicles, say….the mid size Chevy Colorado pickup truck. It will also make a great high performance boat engine.
Both Mercury Marine and Volvo Marine use General Motors engines and market them under their own names. Will they use this next generation high output V8? They have a choice of three different sizes 4.2, 5.5 or 6.2 liters with DOHC. You know they will.
GM seems to be matching the European car makers such as BMW with extreme mid 500 HP engines with size in the mid 4 liter range.
Remember that many countries, such as the European Union, charge import duties based on engine size. So, GM seems to be also targeting the export market for this 4.2 liter Caddy.
The next 5.5 liter DOHC Camaro which will also be used in major drag racing organizations, such as NHRA.
(Written by Mark Smyth & Edited by Bart Charles Begley)