Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Adjustable cam timing pulley

Christ · 03-02-2010, 05:41 PM

Darin - Technically, adjustable cam gears have a basically infinite adjustment, because while they're usually only indexed for 7-14* in each direction, each tooth is typically only slightly more or less than that on the cog.

The result is that you can move the cog a tooth in the direction you want and "back tune" to get those few degrees back.

For instance, one of the Honda engines I had (d series, not sure which one) was 19/32 crank/cam.

360/32=11.25, and with 14* of adjustability, I can make up for an entire tooth this way.

03-02-2010, 05:41 PM	#6 (permalink)
Christ Moderate your Moderation. Join Date: Nov 2008 Location: Troy, Pa. Posts: 8,919 Pasta - '96 Volkswagen Passat TDi 90 day: 45.22 mpg (US) Thanks: 1,369 Thanked 430 Times in 353 Posts	Darin - Technically, adjustable cam gears have a basically infinite adjustment, because while they're usually only indexed for 7-14* in each direction, each tooth is typically only slightly more or less than that on the cog. The result is that you can move the cog a tooth in the direction you want and "back tune" to get those few degrees back. For instance, one of the Honda engines I had (d series, not sure which one) was 19/32 crank/cam. 360/32=11.25, and with 14* of adjustability, I can make up for an entire tooth this way. __________________ "¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"