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 Post subject: P grind cam wanted for test
PostPosted: Sat Sep 30, 2017 7:29 am 
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Joined: Mon Jan 21, 2013 4:36 pm
Posts: 177
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.


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 Post subject: Re: P grind cam wanted for test
PostPosted: Tue Oct 03, 2017 4:12 am 
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Joined: Wed Nov 17, 2010 5:45 am
Posts: 192
PM sent brad. Boucher.


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 Post subject: Re: P grind cam wanted for test
PostPosted: Wed Oct 11, 2017 10:10 pm 
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Joined: Sat Apr 18, 2015 7:06 am
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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


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 Post subject: Re: P grind cam wanted for test
PostPosted: Thu Oct 12, 2017 7:47 am 
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Joined: Mon Jan 21, 2013 4:36 pm
Posts: 177
i have an 8j from another fellow.


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 Post subject: Re: P grind cam wanted for test
PostPosted: Thu Oct 12, 2017 7:51 am 
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Joined: Mon Jan 21, 2013 4:36 pm
Posts: 177
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 197 times ]


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 Post subject: Re: P grind cam wanted for test
PostPosted: Thu Oct 12, 2017 11:09 am 
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Joined: Thu Oct 14, 2010 11:23 am
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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


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 Post subject: Re: P grind cam wanted for test
PostPosted: Thu Oct 12, 2017 12:24 pm 
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Joined: Tue Mar 18, 2014 10:03 am
Posts: 165
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


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 Post subject: Re: P grind cam wanted for test
PostPosted: Fri Oct 13, 2017 8:30 am 
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Joined: Mon Jan 21, 2013 4:36 pm
Posts: 177
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 101 times ]


Last edited by brad black on Sat Oct 14, 2017 7:47 am, edited 1 time in total.
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 Post subject: Re: P grind cam wanted for test
PostPosted: Fri Oct 13, 2017 7:22 pm 
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Joined: Thu Nov 29, 2012 2:06 am
Posts: 51
Nice work Brad 8-)
curiosity question - what are the vertical & hori axis's on your graphs ?
Peter


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 Post subject: Re: P grind cam wanted for test
PostPosted: Sat Oct 14, 2017 7:49 am 
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Joined: Mon Jan 21, 2013 4:36 pm
Posts: 177
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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