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Old 06-11-2008, 10:58 PM   #1
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Join Date: May 2008
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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

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Old 06-12-2008, 03:57 AM   #2
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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..
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