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P grind cam wanted for test
http://ducatittandf1.com/viewtopic.php?f=24&t=11640
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Author:  brad black [ Sat Sep 30, 2017 7:29 am ]
Post subject:  P grind cam wanted for test

i am setting up a horizontal head in a jig to do some cam profile tests and i would like to get a p grind cam for the test. anyone have one i can borrow?

i need a 900ssie horizontal cam too if anyone has one.

Author:  boucher [ Tue Oct 03, 2017 4:12 am ]
Post subject:  Re: P grind cam wanted for test

PM sent brad. Boucher.

Author:  ducbill [ Wed Oct 11, 2017 10:10 pm ]
Post subject:  Re: P grind cam wanted for test

Are you still looking for a 900ss ie hoz cam ?

Just looked through the box of bit & found one marked O8J .

if that's the one your after PM me

Author:  brad black [ Thu Oct 12, 2017 7:47 am ]
Post subject:  Re: P grind cam wanted for test

i have an 8j from another fellow.

Author:  brad black [ Thu Oct 12, 2017 7:51 am ]
Post subject:  Re: P grind cam wanted for test

P - Montjuich, etc
R - F1 (although it's probably more at the later 750 spec of 119 inlet c/l rather than the F1 spec of 110 inlet c/l)
PH - Pantah

Attachment:
pantah.png
pantah.png [ 58.79 KiB | Viewed 1493 times ]

Author:  618F1 [ Thu Oct 12, 2017 11:09 am ]
Post subject:  Re: P grind cam wanted for test

This is very nice Brad.

So the original Pantah cams do have slightly more lift and duration than the later F1 and more-current “R” grind. Certainly shows that R does not mean “race”.

MikeV

Author:  flattop900 [ Thu Oct 12, 2017 12:24 pm ]
Post subject:  Re: P grind cam wanted for test

Hey Brad...
Looks like I'm keeping my pantah cams. According to your cam numbers chart, the 900ssie should lift a little higher than even the P grind. If that is the case, what characteristic makes them a better choice for street bikes, or am I confusing them(P) with a different cam?
Regards...
Flattop

Author:  brad black [ Fri Oct 13, 2017 8:30 am ]
Post subject:  Re: P grind cam wanted for test

the p is an old school long duration cam. it'd be your "full race" from back when "full race" was what all the punters wanted. ht is the 900 carb cams, and the 8j from the 900ie is not that much bigger on the inlet but has a lot more area under the exhaust curve, just like the st2 cam does.

p is great if you want to give away power over most of the rpm range. interestingly, the exhaust opening and inlet closing points are fairly similar across all three. just like the early 4v race cams - a, g, etc, the increase in duration is mostly at overlap.

Attachments:
p ht 8j.png
p ht 8j.png [ 52.42 KiB | Viewed 1397 times ]

Author:  peterbike [ Fri Oct 13, 2017 7:22 pm ]
Post subject:  Re: P grind cam wanted for test

Nice work Brad 8-)
curiosity question - what are the vertical & hori axis's on your graphs ?
Peter

Author:  brad black [ Sat Oct 14, 2017 7:49 am ]
Post subject:  Re: P grind cam wanted for test

fixed the graph. horizontal is degrees of crank rotation from tdc firing to tdc firing. vertical is mm of valve lift.

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