Quote:
Originally Posted by serialk11r
I don't think exhaust reversion is a huge issue other than at low load + low speed (I read a bunch of papers about exhaust reversion trying to figure out how to optimize my VVT).
At low load, you're pretty screwed because the intake pressure is far far below atmospheric.
|
Yep. But low load and rpms is what most here are doing.
And doing so without a Branch specifically made for low rpms...
So think the anti reversion doodats will help some.
If you really want to stop ALL reversion of exhaust into the intake tract:
Put Reed Valves (Carbon/Glass Fiber), on the intakes, as close to the intake valve/s as possible:
This allows the use of an extremely 'hot' intake cam, but gives you infinitly variable intake cam timing... Exhaust cam too, to some (overlap) degree...
IIRC
Honda uses/used them in their 500cc single cylinder 'Thumpers'.
Alfa Romeo experimented on car engines:
Lost ~1kw in top end power, for VASTLY improved low rpm drivability.