View Single Post
Old 10-08-2009, 02:28 AM   #3 (permalink)
dwtaylorpdx
EcoModding Apprentice
 
Join Date: Oct 2009
Location: Portland OR
Posts: 204
Thanks: 1
Thanked 30 Times in 21 Posts
? Ok maybe I'm doing the math wrong, but the axle spins about 1/3 to 1/4 the speed of the engine. Assuming a engine rpm of 2500 at cruise that would put the axle RPM at about 1000 rpm. The engine pulley is about 4 in in diameter and the alt pulley is about 2 so the alt spins 2x the engine rpm so that 5000 at cruise. So we are spinning the alt 20% of the rpm it normally turns.

Your right it would be some load at EOC, but I'm thinking there has to be a simple way to disengage the alt when coasting, Maybe use a maf sensor and a solid state relay to cut the power from the alt? Hmm.

Dave
  Reply With Quote