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Author Topic: Performance Cam  (Read 5861 times)

Offline LOLitsPOOP

  • Posts: 22
Performance Cam
« on: Aug 30, 2015, 06:49:05 »
Hi All

For a couple of months now I have been on the search for a performance cam for the 125/150 Ace.

After some failed attempts sourcing out of China, I finally had success out of Brazil.  For those that aren't aware, there is quite an aftermarket scene for the CG125 based bikes in Brazil.

There are a few main players for cams with "WGK Ressalto" being the tamer of the group and "Vini" and "Ferzza" brands the more wilder ones.  By tame, the WGK offers 292 degree duration with no additional lift.  The others on the other hand offer up to +2mm additional lift and durations up to 330 degrees.

The standard cam in the Ace has 210 degrees duration.

Heaps of research and Portuguese translation later I narrowed down my choices and took a punt on the Ressalto. (P/N WGK1010851)





Sorry for the crap pic but it shows the difference in profile.  Standard on the left, WGK on the right.  The WGK has much steeper ramps and a broader nose.  Big duration and overlap.

Cam is now installed.  The bike starts fine and idles well with a slight fast idle.  Motor is a little more rattley in the top.  Exhaust has gotten louder.  Driveablilty hasn't suffered at all and is still very tractable.  It has lost a little bit of mid-range grunt but top end is much much better.  Before my bike had a nice fat midrange and then became asthmatic as it revved out but now it has a willingness to keep revving and make power.

I am hearing the same feedback from another rider that I did this joint experiment with.

All in all, a worthy upgrade in my books.  Very happy!


Offline stroker crazy

  • DTT SUPPORTER
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  • Posts: 4491
  • crazy as a fox
Re: Performance Cam
« Reply #1 on: Aug 30, 2015, 17:09:09 »
This is a very interesting development!

Good work LOLitsPOOP.

Crazy
“Ride like the Wind” W.H.

Offline orrible-64

  • Posts: 713
Re: Performance Cam
« Reply #2 on: Aug 30, 2015, 22:35:56 »
Great choice for a street able cam . A big thank you for including me in your experiment .


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Offline LOLitsPOOP

  • Posts: 22
Re: Performance Cam
« Reply #3 on: Aug 30, 2015, 23:11:43 »
Im glad you're happy with it too. Never know, if I can sort out some valve springs I might go a wilder cam :)

Offline DohcBikes

  • Posts: 2376
  • Fuck You.
Re: Performance Cam
« Reply #4 on: Aug 30, 2015, 23:21:56 »
Good work, thank you for the research.

Quite a jump in duration and ramp profile there, I would like to see the results of a p/n that has a little less duration than your cam but a little more lift than stock.

Valve spring rates can be measured and more importantly compared with a decent bathroom scale and a drill press.
burning bridges sometimes light the most productive paths

Offline orrible-64

  • Posts: 713
Re: Performance Cam
« Reply #5 on: Aug 31, 2015, 00:17:08 »
Thanks for the tip on that. Wanted to see if cg 250 springs were stiffer. Cheers


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Offline orrible-64

  • Posts: 713
Re: Performance Cam
« Reply #6 on: Aug 31, 2015, 00:19:50 »

Got this one to try after I give it a bit more lift


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Offline orrible-64

  • Posts: 713
Re: Performance Cam
« Reply #7 on: Aug 31, 2015, 00:20:43 »
Oops! Not quite that blunt now.


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Offline DohcBikes

  • Posts: 2376
  • Fuck You.
Re: Performance Cam
« Reply #8 on: Aug 31, 2015, 00:24:27 »
Thanks for the tip on that. Wanted to see if cg 250 springs were stiffer. Cheers


Sent from my iPhone using Tapatalk
no problem. Just find a measuring tool that can show you when you have pressed in the spring one inch. If you have single rate springs that number will be close to your spring rate. If you have progressive springs, measure in increments. You can also measure coil bind with your drill press.
burning bridges sometimes light the most productive paths

Offline Erskine

  • Posts: 2163
Re: Performance Cam
« Reply #9 on: Sep 05, 2015, 17:47:42 »
Top info. Didn't know these existed!