Web 168 cam numbers on stock sprockets

[katman]

I dialed up a set of WEbs on an old 1100 engine I have here and found very little v/p clearance using stock sprockets. At least I think they are stock, haven't seen a set of stocks ones in a while. They are #470 sprockets.

Anyways, for those interested here are the lobe center numbers and such. Piston Valve clearances at 10 degrees before and after TDC was only .030"

Total Valve lift at the keeper with dial indicator was about .330" exhaust and .330 intake. The head and pistons are stock. There is no base gasket (.010") but was a stock head gasket. No decking. I am told by Web there is no advance built into these cams, they are straight up.



I also found the lobe centers using the "lift" method which is basically the same method as finding top dead center of your pistons. Find cam lobe full lift with dial gauge, zero gauge, back up .100" and return to .050" from total lift, record degrees, then proceed onto to .050" after total lift, record degrees. Add together, divide by 2, and you have the actual lobe center.

This method showed an 8 degree difference from the standard degree method. For example, my web 190 cams dial in at 111 degrees using the standard method, and 117 degrees using the lift method.

[rapidray]

Rob, I'm not sure what your point is. Why would anyone ever stick aftermarket cams on stock, non-slotted cam sprockets? The whole point of going to bigger cams is more power & to degree the cams is a MUST! Unless, of course, this is the point you are trying to make? Ray.

[katman]

My point was to show the stock cam cog lobe centers. Lots of guys ask what they are so I thought I would post them. I don't have any stock cams so I used what I had.

[Big Jay]

Stock GS cam timing was all over the map as shipped. One of the performance shops back then, used to redegree the stock cams as part of their "performance tuneup" and it would really wake them up.

[Nessism]

Stock GS cam timing was all over the map as shipped. One of the performance shops back then, used to redegree the stock cams as part of their "performance tuneup" and it would really wake them up.

Jay,

What cam centerlines do you recommend for a bone stock GS1000? Interested in low end and midrange, more than top end.

[rapidray]

Ed, 104 intake & 106 on the exhaust will work well with that engine. Check them stock to see where they are first. Ray.

[Nessism]

Ed, 104 intake & 106 on the exhaust will work well with that engine. Check them stock to see where they are first. Ray.

Will do Ray. How far off justifies the work?

[rapidray]

They can be all over the place the way they come from Suzuki, Ed. If they are LESS than 104/106, they will have better bottom end as they are, just so you know. Ray.

[BadBillyB]

These cams were designed for use with high compression pistons with deeper valve pockets. They also have a lot of duration. Thats why the valve to piston clearance is so tight.....The likely reason you got different lobe centerline results, using the 2 different methods, is the lobes are probably not symmetrically ground. Like this......Billy