CBR 900 cam characteristics ? - Honda Motorcycles - FireBlades.org
Honda FireBlade Discussion of the Honda CBR 900RR, Honda CBR 929RR, Honda CBR 954RR, and Honda CBR 1000RR Motorcycles.

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post #1 of 7 Old 01-28-2011, 6:08 AM Thread Starter
 
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CBR 900 cam characteristics ?

Hi,do you know stock characteristicks of cbr 900 99 rrx?Valve lift,duration,duration 0.050? I am thinking of winter project,including some cam job...
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post #2 of 7 Old 01-28-2011, 8:23 AM
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Re: CBR 900 cam characteristics ?

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Originally Posted by Dobromir View Post
Hi,do you know stock characteristicks of cbr 900 99 rrx?Valve lift,duration,duration 0.050? I am thinking of winter project,including some cam job...

Honda lists the cam specs in all their OEM manuals.
IN 15BT-35AB, EX 39BB-11AT (at 1mm) - duration of 230/230
For Cali: IN 0BT-37AB, EX 40BB-0AT (at 1mm) - duration 217/220
Lobes are: IN 36.04-36.28mm, EX 35.80-36.04mm
For Cali: IN 34.94-35.18mm, EX 35.10-35.34mm
I _think_ the base circle is 28.25mm (same as the 929/954) and the lift is the lobe minus the base circle so around 7.9mm and 7.7mm (6.8mm and 7mm for Cali.).


For comparison, Web lists three grinds (but they measure them at 1.25mm which is rather pointless):
7.82mm lift and duration 228/228 (at 1.25mm) which is probably near enough to identical to the stock cam.
8.43mm lift and 239/239
IN 8.94mm EX 8.43mm and 243/243 but requires different springs and retainers on the intake due to the reduced base circle.
Web Cam Inc. - Performance and Racing Camshafts / Honda CBR 900 RR (93-01) DOHC 16v

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Re: CBR 900 cam characteristics ?

Thank you for the quick reply!Great post with all the information I need!
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post #4 of 7 Old 01-28-2011, 5:31 PM
 
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Re: CBR 900 cam characteristics ?

thanks bladeracer, i was just looking for this the other day.

without totally thread jacking, do you have the 929/954 cam specs?
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post #5 of 7 Old 01-28-2011, 9:10 PM
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Re: CBR 900 cam characteristics ?

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Originally Posted by packman5280 View Post
thanks bladeracer, i was just looking for this the other day.

without totally thread jacking, do you have the 929/954 cam specs?

Actually, I do :-)
I was asked a couple of days ago via PM about using 1000RR cams in the 954.

929 cams have 36.60mm and 36.20mm cam lobes - 8.35mm and 7.95mm of lift. 929 timing is 25BT, 35AB, 40BB, 20AT and duration 240/240.

954 cams have 36.86mm and 36.20mm lobes - 8.60mm and 7.95mm of lift.
954 timing is 25BT, 38AB, 41BB, 22AT and duration 243/243.
I just measured up some spare 929 cams and the base circle is 28.20-28.30mm - I guess a nominal 28.25mm.

'04/'05 1000RR cams have 37.06mm and 36.70mm, 18BT, 46AB, 39BB, 11AT and 244/230, so 0.20mm more lift and a little more overlap (assuming the same base circle diameter as 929/954) which is not significant. If the base circle is different then you would need different lifters as well.

If you have some 1000RR cams to measure up, the 929/954 specs are - journals are 26mm, lobes are 10.2mm wide at 32mm centres and of course the bore spacing is 81mm. I have been told the 1000RR is also 81mm bore spacing but I know Wiseco do 76mm pistons for the 929/954 but only 75mm for the 1000RR so Honda may have closed the spacing up to 80mm.
Web Cam Inc. - Performance and Racing Camshafts / Honda CB 954 RR (02-03) DOHC 16v

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Re: CBR 900 cam characteristics ?

Just a though-can I put 929 or 954 cams on my 919 if the main circle is the same?Will that improuve the performance?
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post #7 of 7 Old 01-30-2011, 6:46 AM
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Re: CBR 900 cam characteristics ?

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Originally Posted by Dobromir View Post
Just a though-can I put 929 or 954 cams on my 919 if the main circle is the same?Will that improuve the performance?
I think the 900RR has wider bore spacing, so no.
If the engines have the same bore spacing, the same size journals and journal spacing and compatible oil galleries and feeds then it might be possible. I doubt there'd be significant improvement to warrant the effort and expense though. You may also have to modify any pickups off the camshaft as well.
Far simpler to have your cams reground to exactly what you want from them.

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