Carb heat = reduced air density = less oxygen per mass of air = less fuel burned per mass of fuel = less HP.
Less HP = govornor opens throttle butterfly to maintain RRPM = higher MP for same blade pitch (same HPR).
However, in this case higher MP does not = more HP so manifold pressure limits do not apply, as MP limits are designed to keep max continuous engine output <= 124 hp (or <= 131 HP 5-minute takeoff).
Super simple, huh.
Last edited by Flingwing207; 19th October 2004 at 17:25.