camshaft comparison - Fuelly Forums

Android Users - Coming Soon! - Migrating from aCar 4.8 to 5.0

Reply
 
Thread Tools Display Modes
 
Old 06-11-2008, 11:58 PM   #1
Registered Member
 
Join Date: May 2008
Posts: 140
Country: United States
camshaft comparison

motorcycle engine, 1500 cc 6cyl. calif. and 49 state cam profile:
calif intake valve / 49 state intake valve
opens 5 ATDC / opens 5 BTDC
closes 40 ABDC / closes 45 ABDC

calif exhaust valve / 49 state exhaust valve
opens 40 BBDC / opens 35 BBDC
closes 5 BTDC / closes 5 ATDC

both cams have same lift. I own calif. model and am able to advance or retard cam 3 degrees. any suggestions for improving A. lowend torque, and B. fuel economy ? or preferably both? maximum torque is 96 ft lbs @ 4500 RPM 5th gear @ 55 MPH is 2500 RPM
__________________

mikehallbackhoe is offline   Reply With Quote
Old 06-12-2008, 04:57 AM   #2
Registered Member
 
Join Date: May 2008
Posts: 211
Country: United States
Advance the cam for more mileage and bottom end torque, retard the cam for more top end power..

It was a fairly common observation when I was learning about cars in the late sixties that old small block Chevys ran stronger on the top end when they got a lot of miles on them.. It took me many years to figure out that as the cam chains wore and got stretched the cam timing was retarded..

I can't imagine that you would pick up enough torque/mileage by swapping stock cams to begin to save enough fuel to pay for the parts and trouble swapping them..

Not to mention that putting a new cam on old lifters is going to be a possible source of trouble..
__________________
94 Altima 5 spd.. Stock.. 29 mpg combined with basic hypermiling techniques ..

89 Yamaha FZR400 Crotch rocket, semi naked with only the bikini fairing, no lowers, 60 plus mpg

87 Ranger 2.3 5spd.. Does not currently run..
fumesucker is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
FS: Original HF CRX $900 OBO in MD Danronian For Sale 2 12-03-2007 08:36 PM
Terrapass anyone McPatrick General Fuel Topics 9 06-29-2007 07:54 PM
Ever have seatbelts save your life? Silveredwings General Discussion (Off-Topic) 18 11-22-2006 05:01 PM
Vacuum Guage and Digital Fuel Gauge krousdb Experiments, Modifications and DIY 37 04-19-2006 04:23 PM
Hybrid Scooter kickflipjr Motorcycles 4 10-01-2005 02:31 PM

Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 03:43 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.