| [GMCnet] More on final drive ratios [message #237976] |
Wed, 29 January 2014 15:57  |
glwgmc
Messages: 1014
Registered: June 2004
Karma:
|
Senior Member |
|
|
We finally headed south yesterday. Where we live we have to climb mountains in all directions anywhere from a mean climb of 1500 feet to around 4500 feet. With the new S@J engine (Spokane, WA), a 3.5 chain in the transmission and a 3.21 final drive our heavy 78 Royale did the climb over Siskiyou Pass (highest point on the I5) in third gear. Never saw less than 4" of vacuum or less than 50mph. Never felt or sounded strained. Going down the south side we stayed in third and only needed the brakes a few times. Both attributable to the relatively high compression of a new engine (still in breakin mode with just 1200 miles when we left home) and the gearing. While some may disagree, I think having the cam timing set 4 degrees advanced and the Patterson distributor set to 10 degrees static advance at 400rpm with the vacuum plugged both played a role as well.
Jerry
Jerry Work
The Dovetail Joint
Fine furniture designed & hand crafted
in the 1907 former Masonic Temple building
in historic Kerby, OR
Http://jerrywork.com
541-592-5360
Cell 541-499-1027
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Jerry & Sharon Work
78 Royale
Kerby, OR
|
|
|
|
GMCforum
Search
Help
Register
Login
Home
