H2OLDS Posted March 22, 2008 Report Share Posted March 22, 2008 ok i just picked up my bike from cycle werks after installing the shearers it dynoed 68.88 hp and 40tq keep in mind this is on stock stroke and cylinders ported by jeff at f.a.s.t i had to go down on the mains from 155 to 148 and its still a little rich.he said when it reaches 100 degrees outside to go to 145 mains and it will pickup about 4 more hp.this number was obtained after 5 pulls and tweaking between runs does this sound about right? oh the mods are pwk33s,vitos intakes,coolhead with 20cc domes,timing at +4,shearer inframes,aggressive dune port by fast. Quote Link to comment Share on other sites More sharing options...
Bansh-eman Posted March 22, 2008 Report Share Posted March 22, 2008 thats a good number for stock stroke and ported stock jugs Quote Link to comment Share on other sites More sharing options...
flotek Posted March 22, 2008 Report Share Posted March 22, 2008 sounds about right ...shearers are known for their peak numbers o n an agressive port and fine tuning makes sense to have this with mid to upper 60's on the stock stroke Quote Link to comment Share on other sites More sharing options...
06BaNsHeE Posted March 22, 2008 Report Share Posted March 22, 2008 Thats actually pretty good.Most people get around mid 80s with a full drag port,OOF drag pipes and alky.So for a lil gas duneport that impressive Quote Link to comment Share on other sites More sharing options...
H2OLDS Posted March 22, 2008 Author Report Share Posted March 22, 2008 yeah i am very happy with the results.i will be doing a 421 cub setup next and am hoping for somewhere around the 90hp range Quote Link to comment Share on other sites More sharing options...
Snopczynski Posted March 22, 2008 Report Share Posted March 22, 2008 What rpm? Quote Link to comment Share on other sites More sharing options...
H2OLDS Posted March 22, 2008 Author Report Share Posted March 22, 2008 according to the sheet it peaked at just over 10k it hit 50hp at about7.7k but doesnt have much at all until about 6.5k rpm Quote Link to comment Share on other sites More sharing options...
Snopczynski Posted March 22, 2008 Report Share Posted March 22, 2008 (edited) Thats definitely some high rpm, so it equates to faster wheel travel for the hp number obtained. I made around 66.7 hp on my motor at 8650 rpm with pro circuits, and a low-mid port job. Of course now that I ran it, I bought a dyna cdi, dyna coil, and bumped up the compression and changed out the reeds again. So, I ought to be around 69-70hp when its tuned in. Edited March 22, 2008 by Snopczynski Quote Link to comment Share on other sites More sharing options...
2strokespirit Posted March 24, 2008 Report Share Posted March 24, 2008 ok i just picked up my bike from cycle werks after installing the shearers it dynoed 68.88 hp and 40tq keep in mind this is on stock stroke and cylinders ported by jeff at f.a.s.t i had to go down on the mains from 155 to 148 and its still a little rich.he said when it reaches 100 degrees outside to go to 145 mains and it will pickup about 4 more hp.this number was obtained after 5 pulls and tweaking between runs does this sound about right? oh the mods are pwk33s,vitos intakes,coolhead with 20cc domes,timing at +4,shearer inframes,aggressive dune port by fast. Pump gas? what octane? Quote Link to comment Share on other sites More sharing options...
Snopczynski Posted March 24, 2008 Report Share Posted March 24, 2008 yeah, but it was tested on a rear wheel chassis dyno and that is not accurate unless compared to other bikes tested on the exact same dyno. Quote Link to comment Share on other sites More sharing options...
shanYE west Posted March 24, 2008 Report Share Posted March 24, 2008 (edited) yeah, but it was tested on a rear wheel chassis dyno and that is not accurate unless compared to other bikes tested on the exact same dyno. So how do you calculate rear wheel HP off the dyno your using? or are you just going by the number from the output shaft only? Edited March 24, 2008 by Fouledout421 Quote Link to comment Share on other sites More sharing options...
theshee Posted March 24, 2008 Report Share Posted March 24, 2008 yeah i am very happy with the results.i will be doing a 421 cub setup next and am hoping for somewhere around the 90hp range The 421 I have for sale in the for sale section made 88 horse at 5200 feet elevation last year.... 421s are strong motors. Quote Link to comment Share on other sites More sharing options...
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