GAS - regular or premium?

[NancysToy]

If they were CC'd, I agree they'd be static numbers. But why would BRP claim a much higher ratio in their spec's. Which they've posted in many places, for several years now. If it were not close to being true, wouldn't they get called out sooner or later?

I'm wondering if the 9:1 claims aren't dynamic compression estimates, which are based on cranking pressure, and are typically lower than static estimates, due to intake valve timing......:dontknow:

I suspect dynamic calculations, too, but knowing BRP's propensity to screw up almost every statistic that they publish, including fuel tank size, wheel track, and even the RT horsepower, they could have pulled these numbers out of a hat, too. Never let an advertising intern prepare your paperwork. :roflblack:

 

[BLACK WIDOW]

In simple terms The higher the octane the slower it ignites,it's needed in a high compression engine to control pre ignition. Somebody with better typing skills can explain it much better.
Note RT= 87 minimum RTS= 91 minimum, That's minimum you can go higher.

:agree:

 

[QuadManiac]

Heck, maybe they're publishing the relative adiabatic compression... the static plus the effective additional compression due to adiabatic heating?