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A9 cam...
by: nwhicks21 - Aug 28, 2013 11:55:08 GMT -5
Post by nwhicks21 on Aug 28, 2013 11:55:08 GMT -5
So I just received my new a9 cam and it looks exactly the same as my stock cam, if anything the lobes look shorter...is there anyway to know If I got the right one?
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Sophomore Rider
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A9 cam...
by: freefour1968 - Aug 28, 2013 12:05:39 GMT -5
Post by freefour1968 on Aug 28, 2013 12:05:39 GMT -5
With the lobes being shorter it will give you more power on the top end rather low end I believe . Like instead of you hitting your peak power at 7200-7400 you will hit it around 7800-8000 , not necessarily more speed but you are moving we're the power is on your rpms .
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A9 cam...
by: scoots - Aug 28, 2013 12:06:10 GMT -5
Post by scoots on Aug 28, 2013 12:06:10 GMT -5
where did u buy it and what is the maker normaly located on the sproket part
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Sophomore Rider
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A9 cam...
by: nwhicks21 - Aug 28, 2013 12:54:09 GMT -5
Post by nwhicks21 on Aug 28, 2013 12:54:09 GMT -5
Bought on eBay and it has a LT stamp on the gear with a circle around it
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A9 cam...
by: phssthpok - Aug 28, 2013 16:10:24 GMT -5
Post by phssthpok on Aug 28, 2013 16:10:24 GMT -5
The 'height' of the lobe from the center-line of the camshaft (AKA: Lift) is but one part of a cam lobe profile. There is also 'duration' to consider.
A marginally taller (or even stock height) lobe with a significantly longer duration (fatter lobe) may appear 'shorter' than a stock cam lobe to the naked eye due to the visual change in the ratio of lift to duration.
Also, cam lift can be modified by reducing the baseline diameter of the lobe, which would have the same effect as increasing the height of the lobe. This too can 'trick' the eye.
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A9 cam...
by: carasdad - Aug 28, 2013 16:33:16 GMT -5
Post by carasdad on Aug 28, 2013 16:33:16 GMT -5
 Also the LSA (lobe separation angle) affects the performance. The difference is so small on these engine cams that you need a degree wheel and runout gauge to measure. Too many subtle things that make a big difference can not be 'eye balled' I did a cam test and measuring for a parts dealer..here is an excerpt from what we found..and emailed back to them * So far this is what I have but we are going to verify it before we say yes. The cam with all the holes(looks like #2 cause then Pen marks smudged) It has intake lobe widest point is 25.78 exhaust widest point 25.67.. lift is 5.86 LSA (Lobe seperation angle) is 119 degrees. Meeting the criteria for an A9 cam The one marked #1..again hard to see as the numbers smudged..but is the one with only 3 holes. It has intake lobe widest point is 24.48 exhaust widest point 24.52.. lift is 5.02 LSA (Lobe separation angle) is 116 degrees. Which meets the criteria for an A8 cam. Even though the first one I mentioned above is only slightly different from the second one. Those 3 degrees more separation combined with the wider lobe and higher lift allows the valves to stay open longer....allowing more time for a larger intake volume and exhaust volume. Hence the reason they rev higher and have more power output than the A8 cam with its lift specs..lobe width and the 116 duration. *.. That snip from the email should either help you...or confuse you...lol.. ;D
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main jet
