The G62 is in a different class, it's the required by the rules stock engine...There are presently 2 ZDZ engines being tried for racing, an 80 single and a 160 twin...the 80 will have to run on methanol and turn at least 11,000 to compete with GT80s that turn almost 12,000 in the air...The 160 twin will have to compete with DA 150s, Aerrow 200s, and Herbrandson 289s...The DAs and Aerrows are turning 10,000 with 21x25 race props, the 289 is turning a 21x27 at 9400...No tuned pipes are used, just stacks shorter than 8 inches....
We'll see how they did after the race in the last week of this month..
No engine has yet beat the "overweight, underpowered, boat anchor" (conventional wisdom) GT 80s at this game..
Y'all are welcome to try
Sachs 4.2s, Husky 4.4s, and Quadra Aerrow 75s, 3W twins, prepared by some pretty fair tuners, have failed...
Someone tried a ZDZ 210 twin a few years ago, looked promising, didn't win....