CAM SHAFT REGRIND

[oldbikeman]

Hello can anyone help me with a camgrind service.I will post effects of changes.
Thanks Paul

[benny hedges]

have a word with tony mon when he gets back from grease

he's sent his off somewhere to get done.
kent do them as well and a few other places, couldnt tell you to what spec tho...

[oldbikeman]

I want more bottom end power so it'll pull like a Ducati Monster,Wheel y straight off the throttle!
What I Want:-
Inlet open 10drgs BTDC
close 40 ABDC
Exhuast open 40 BBDC
close 10 ATDC
About the same as a sports four or a sports single.
A Storms timing is just as wild as a SP's. I'd be happy to lose 20mph off the top end for over all gruntier motor.
Here's some more stuff.
Valve Timing:-
CB1100F VFR800 CB600F HondaXR600
15BTDC in o 10 15 Inlet O 5dg BTDC
35ABDC c 35 35 C 40dg ABDC
40BBDC ex o 35 38 Ex O 45dg BBDC
10ATDC c 10 7 C 5dg ATDC
Engine Weights
Honda:-
VTR1000F 74.2kg/163.6lbs
SP1/21000 70.5kg/155.4lbs
VFR800 74kg/163lbs
CB1100F 82.8kg/182.5lbs
CB600F 61.9kg/136.5lbs

[benny hedges]

if you want mad wheelies put a 14t sprocket on and a rc45 90 degree throttle tube. scary sh1t lol!

[tony.mon]

Here's what I came up with:

Open/Close/Cam Lift (mm)/ Lobe Centre/Duration

KENT:
IN::BTDC 22/ABDC 54/10.36/106 (256 deg. duration)
EX::BBDC 60/ATDC 28/10.56/106 (268 deg. duration)


MORIWAKI:
IN::BTDC 22/ABDC 53/10.3/105.5 (255 deg. duration)
Ex::BBDC 53/ATDC 16/10.1/108.5 (249 deg. duration)

YOSHIMURA:
IN::BTDC 17/ABDC 53/10.7/108 (250 deg duration)
EX::BBDC 55/ATDC 15/10.7/110 (250 deg. duration)

Stock
IN::20/45/?/102.5 (245 deg. duration)
EX::50/15/?/107.5 (245 deg. duration)

From RollingAlong's post in Superhawk forum:
IN::?/?/10.16/? (249 deg. duration measured)
EX::/?/?/11.0/ (272 deg. duration (measured)

(see: http://www.superhawkforum.com/forums/sh ... php?t=6634)


Currently still waiting for mine from a local grinder's, Newman Cams. They aren't getting a recommend from me as I let them have the cams in April, said I wanted them for June.
But I'll let it go for now, as I'm not yet completely ready to start the rebuild quite yet.
I'll measure and post the results once I get them.
He said he could just get a longer duration by lowering the base circle by 1mm, and taking 1mm off the peak.
The benefit will be that they won't need to be built up first.

Should leave a longer duration, but I'll have to degree them in once I've rebuilt the motor to see how they perform.

If yu find anyone who can do the work and seems to know what they are on about, let us know....

[benny hedges]

interesting data there chief.... quite a bit of difference between the different makers.
not got a clue what mine are unfortunately...
the dyno guy said he thought they wanted dialling in proper tho so may have to invest in some slotted gears, or just get some standard ones and get them slotted or file them meself...

[tony.mon]

You can file them yourself, they're hard but not too hard.
Might be worth using washers that grip the surface to stop them moving?
Those bolts with a sawtooth underside might do it.

[benny hedges]

i'd rather save a few 100 tbh and have roger or dyno andy do it...
no point me doing it if ive got no data on the cams, no verniers and no dyno.

let me know the clearance piston crown to valve tho with your new goodies...

[tony.mon]

Try this set-up guide for cams: http://www.muzzys.com/articles/lobe_centers.html

[benny hedges]

nice one chief - i shall digest that

[tony.mon]

i'd rather save a few 100 tbh and have roger or dyno andy do it...
no point me doing it if ive got no data on the cams, no verniers and no dyno.

let me know the clearance piston crown to valve tho with your new goodies...

You could easily just use a dial gauge to find the lobe centre, then adjust (say) three degrees back or forward to see what difference it makes- all it'll cost you is time.

But as those cams have been made by HRC I'm not sure that you'd find much improvement- I tend to trust their engineering skills and judgement.