986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - New owner, age old question :-)

blue2000s · 03-15-2008, 07:24 AM

I don't have any concrete evidence, but I'd guess that they've improved breathing over the years with port, head, valve and valve timing changes. Continuous variable valve lift and timing was introduced in 2003 which certainly aided in power output.

Notice that power went up by 12% but torque only went up by 4%, meaning the torque curve either moved higher up in the RPM range or it widened, meaning better breathing either higher up or across a wider RPM range. This, to me, points to the improvements in valve timing.

03-15-2008, 07:24 AM	#6
blue2000s Porscheectomy Join Date: Mar 2006 Location: Seattle Area Posts: 3,011	I don't have any concrete evidence, but I'd guess that they've improved breathing over the years with port, head, valve and valve timing changes. Continuous variable valve lift and timing was introduced in 2003 which certainly aided in power output. Notice that power went up by 12% but torque only went up by 4%, meaning the torque curve either moved higher up in the RPM range or it widened, meaning better breathing either higher up or across a wider RPM range. This, to me, points to the improvements in valve timing. Last edited by blue2000s; 03-15-2008 at 07:48 AM.