Thanks portichead ric for the dynograph, through searching I found this a while ago https://docs.google.com/spreadsheets/d/18IS8MBcAoalpOWOmf45hpNSlX-czfCmkZuA7oV0NCzQ/edit , and I taught myself what some of the more basic data means, I think!
If the data is correct, then price r cams should have the bring the power band in nice and low and have good low to mid torgue. But loose out on top end power to the s cams and magnum cams, the magnum cams from what I can see there have the best top end. But we all know when it comes to a performance engine its how well the whole package is designed, and the quality of the build. I think Ace make the best engine package.
I'd still be interested to know Hitchcocks cam data.
The most important aspect is the head.
Cams do their job, and are important, but they need a good head.
Also, the R Cams should significantly outperform the S Cams, mostly due to the higher lift. If the S Cams really do close the exhaust valve at 50°ATDC, then that is too late(IMO) for a street bike, and would be expected to lose some low rpm torque from that, compared to the others.
On that spreadsheet, there is an error on the re-phased stock cams entry. It closes inlet at 78°ABDC, not the 27°ABDC shown on the spreadsheet.
And the stock CI cams close inlet at 60°ABDC, not the 45°ABDC shown on the spreadsheet.
I know most of the Hitchcock cam figures too. They are all more racing oriented than what I do, but they do give good peak hp figures. I guess it depends upon rider sensitivity to low rpm torque. He says they ride fine around town. I have received numerous comments by owners who would not agree. At any rate, my cams are milder than his, and are more "torquey" down low due to shorter overlap. We use the better flowing head to get good power results with milder cams.
Topic: Anyone know what these cams are? (Read 24868 times)