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cams for GS 1000

  • Thread starter Thread starter 48woody
  • Start date Start date
web 110 best option for street

web 110 best option for street

get the web 110 grind worth 2X their weight in gold. drop right in, instant seat of the pants power increase.

cam timing numbers are not exact and vary from engine to engine even if they have the same equipment combination.

this is where there is a bit of black magic and real tuning secrets are truly kept. ( but I'll give you just a taste)

some engines will pull crazy hard with 103 int and 105 exh and other engines will pull harder with 108 int and 110 exh. These numbers are relative to a certain point depending on final drive gearing and weight of the bike and rider. You can run equal numbers on int and exh there are no set rules except for mechanical interference.(valve to valve and valve to piston) Now if you start to tune down to lobe centers like 112 and 114 numbers you will get so much more bottom end at the expense of top end revving.(higher numbers are safer to run due to lack of interference)

this is where you need to decide some limits and have a plan of what you really can/cannot live with.
 
trippivot said:
Now if you start to tune down to lobe centers like 112 and 114 numbers you will get so much more bottom end at the expense of top end revving.(higher numbers are safer to run due to lack of interference)

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Click to expand...
You sure about that? Those are top end numbers. 103 to 105 are bottom end numbers.
 
Thanks for all the replys to this thread and all the info. I can see that when I get my motor rebuilt, hopefully by next spring, I'll be spending some time degreeing in the cams to get the best performance. everything else, larger pistons, head, etc seem fairly straight forward. The cams and carb tuning will take the fiddling with to fine tune the bike. I didn't mention originally, but have been thinking of looking for a set of 34mm flatsides for carbs.
 
I am probably wrong. I must assume you get your information from a book- not a dyno or the drag strip.

I positively sure the lower numbers create a stronger sonic pulse that pulls air/fuel into the engine.

I am also positive I can make more power with a smaller displacement engine than most engine designers.

I want to make a statement:

theory and reality do not live in the same neighborhood. practical application of cam timing numbers are relative to the work being done.
 
Last edited:
Sorry Jeff, but you ARE wrong on your lobe center numbers. You got them backwards & I AM an engine builder! I don't just play one on TV! LOL!!! Ray.
 
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