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Camshafts

Posted: Sat Jul 10, 2010 9:34 am
by Racing
Upcoming winter i plan on ripping the engine of mine apart-again.
Point in case being,where do i find specs of OEM duration and LCA angles for the stock sticks of the FZR600?

LCA for clarity-Lobe centerline angle.
Ie;the interelation between the intake and exhaust cam.

Have looked through the OEM manual but can´t really find any specs for it per se and as i gather sprockets as well as chan asf are rather stretched and worn i thought i´d handle this in a litte more serious manner as i approach the job.

Re: Camshafts

Posted: Tue Jul 13, 2010 10:54 am
by haunter
Stock FZR400
lift duration at .040
.299" 238°
.288" 230


thats all megacycle lists sorry

the yec cams are:
CAM VALVE DURATION LOBE INTAKE OPEN/CLOSE RUNNING
NUMBER LIFT AT .040" CENTERS EXHAUST OPEN/CLOSE CLEARANCE
276-x9 .306" 246° 100° 23 btc/43 abc .007"
.286" 237° 100.5° 39 bbc/18 atc .010"

Re: Camshafts

Posted: Wed Jul 14, 2010 5:29 am
by Racing
Imperative part IMO would really be the stock LCA,which from the Yec cams table would be 100+100,5/2=100,25 and as basicaly noone out there would ref an LCA for a quart of a degree an LCA of 100 would be nominal.
Sounds reasonable enough from an empirical POW when one considers how the engine runs stock @idle asf.
Main Q then would be if that "around the 100 spread mark" is to be expected from the stock sticks as well.?

Noone out there with a degree wheel that´s been throught the paces?

Re: Camshafts

Posted: Wed Jul 14, 2010 9:52 am
by haunter
from what I read the 600 cams are VERY similar to the 400 YEC cams.