Degreeing my cams

[Craig]

I have a 83 GS 1100 ESD. I am putting in new cams - 0.348" lift, 257 degree duration @ .050". I am using adjustable cam sprockets. Any ideas as to a good staring point for both the cams? Thanks in advance for your help.

Craig

[first timer]

i have heard that 106 degrees on both is a good point to start.


ryan

[skip]

106 is a good place depending on what you want. if you want a combonation of low to midrange punch that is a good place to start. if you are looking for more high end power like in dragracing then you want to degree them a litlle higher like 110 degrees. I have g-4 cams and have run them at 106 and 110 degrees at 110 they make power about 1500 rpm higher then at 106

[KEITH KRAUSE]

For the widest powerband and best compromise between top end HP and low/mid-range torque, 106 on both works well.

[Anonymous]

i once read on Cope racing websitesite. ((ask Greg) He liked 108 for street compromise. Lots of folks recomend 106. I like the combo skip recomends because of my particular riding preferences. now al i have to do is get a decent set of cams and some adjustable gears.

[SqDancerLynn1]

Check this other thread for degree wheel info

http://www.thegsresources.com/_forum/viewtopic.php?t=14716&highlight=degree+wheel

[Craig]

Degree Wheel

Thanks for the image of the degree wheel. Now...does anyone have the information on how to get the job done??

Thanks...Craig

[Hap Call]

Re: Degree Wheel

Thanks for the image of the degree wheel. Now...does anyone have the information on how to get the job done??

Thanks...Craig

I stole this from Scotty:

http://www.thedirtforum.com/degree.htm

Hap

[Anonymous]

Or this one:

http://www.muzzys.com/articles/lobe_centers.html

[Anonymous]

There is one point in this thread which seems to have been completely overlooked. That is; what is the manufacturers recommended installation center? Every cam is different. XXX degrees of duration does not mean squat from one cam to another, if they have been designed with different lobe centers. So the starting point should be the manufacturers recommendation. Then you can advance or retard the cam if a different power band is desired, keeping in mind that changes of less than 4 degrees will be insignificant. You should also be aware that the cam in question will always make its Maximum Total HP at the centerline it was designed with. Just some food for thought.

[Anonymous]

thought I had a link for you. I'll keep looking.

[Mr. Jiggles]

Web Cams' website has a nice write-up on degreeing:

http://www.webcamshafts.com/degreeing.html

Jeff

[Anonymous]

Jeff - I think that's the one I was refering to. Jiggles does it again.

[skip]

There is one point in this thread which seems to have been completely overlooked. That is; what is the manufacturers recommended installation center? Every cam is different. XXX degrees of duration does not mean squat from one cam to another, if they have been designed with different lobe centers. So the starting point should be the manufacturers recommendation. Then you can advance or retard the cam if a different power band is desired, keeping in mind that changes of less than 4 degrees will be insignificant. You should also be aware that the cam in question will always make its Maximum Total HP at the centerline it was designed with. Just some food for thought.

good point use the mfg recomendations as the starting point and then adjust.

[KEITH KRAUSE]

There is one point in this thread which seems to have been completely overlooked. That is; what is the manufacturers recommended installation center? Every cam is different. XXX degrees of duration does not mean squat from one cam to another, if they have been designed with different lobe centers. So the starting point should be the manufacturers recommendation. Then you can advance or retard the cam if a different power band is desired, keeping in mind that changes of less than 4 degrees will be insignificant. You should also be aware that the cam in question will always make its Maximum Total HP at the centerline it was designed with. Just some food for thought.

good point use the mfg recomendations as the starting point and then adjust.

Cam timing, at least back in the '70/'80's, was a very difficult and expensive tolerance to hold for the manufacturers. Each engine has slight differences. The manufacturers did not set cam timing uniformly, they set it within a range. This goes for all Japanese bikes. The GS's could be set anywhere from 98-115 degrees. This was the main reason 2 identical bikes would differ in performance. The BEST cam timing very much depends on how you use your motor. But for the best compromise between top end HP and low/midrange torque AND the widest powerband, 106 degrees is good.