(jimbob8915 @ May 30 2007,23:04) Running dual intakes right now and can get a real good deal on a set of yosh drop-ins. I can also sell one intake and get the single web intake. Which is better and why?
Long term you will have better durability running an exhaust cam made for the job . One that runs dead center on the lifter bucket .
To get at your question , the Web 378 has a larger base circle and more effective duration than the Yoshimura intake cam . It is not a little cam for a 4 valve street motor . They don't like alot of duration if the owner wants some type of usable low end that is . The Web requires valve springs whereas the Yosh can use the stock springs if not high mile and fatigued . The more head you have with either set ,the better they will run .
As far as the Yoshimura being too small for large bore engines, I can't agree with that after see'ing a 222hp pump gas stroker engine dyno sheet .
Yoshimura cam specs
Intake duration 244 @.040 valve lift
Exhaust duration 230 @ .040
Intake lift - .354
Exhaust lift - .307
WebCam cam specs
Intake duration 244@ .050 valve lift
Exhaust Duration 226 @ .050 valve lift
Intake lift .378
Exhaust lift .330
If you were to check the Webs in a engine you would find the duration @ .040 would be right at 249 intake-231 exhaust .
The .040 checking point Yoshimura, Megacycle and Kent Cams uses on their cam cards cannot be directly compared to the .050 checking point WebCams uses .
If you used the .050 lift point for the Yoshimura cams , the duration would be right around 240 on the intake as another example .
Much depends on compression,weight of the rider and intended usage when deciding on cams and same for deciding on where to put the installed center angles at .
