Rocker Follower Life: 53 cam vs 08.

Supermoto_Husaberg · Oct 4, 2004

Hello,

I am running a 2002 650 SM. It has a 53 cam and the 2003 rockers. I am getting a bit fed up with replacing the rocker bearings (rockers assembly) and was wondering whether fitting the 08 cam would allow me to increase the interval ?

Looking at Dale's graph: http://www.husaberg.org/modules.php?set ... _photo.php

It appears that the 08 cam has a less steep opening and closing and that because of this the accelerations induced on the rocker bearings are reduced. I am also fitting a high comp piston and 2003 cylinder head to my 2002 650. Should I fit the 08 cam ?

Help please.

Lloyd

LINEAWEAVER · Oct 4, 2004

Supermoto_Husaberg said:
Hello,

I am running a 2002 650 SM. It has a 53 cam and the 2003 rockers. I am getting a bit fed up with replacing the rocker bearings (rockers assembly) and was wondering whether fitting the 08 cam would allow me to increase the interval ?

Looking at Dale's graph: http://www.husaberg.org/modules.php?set ... _photo.php

It appears that the 08 cam has a less steep opening and closing and that because of this the accelerations induced on the rocker bearings are reduced. I am also fitting a high comp piston and 2003 cylinder head to my 2002 650. Should I fit the 08 cam ?

Help please.

Lloyd

Hi Lloyd,
The improvement will be marginal as acceleration and jerk characteristics remain excessive with the 08 profile. You will also sacrifice peak power in addition to decreasing the useable power range.

Hope this helps.

Kind Regards,
Dale

Ps
How tight are you currently turning the engine?

Supermoto_Husaberg · Oct 5, 2004

LINEAWEAVER said:
Ps
How tight are you currently turning the engine?

I don't get what u mean ?

Will the engine lose peak power or gain peak power with an 08 over a 53 cam ?

The engine is currently at 54 rwhp.

Lloyd.

Taffy · Oct 5, 2004

the cam has less duration and less peak lift. when a cam smashes a valve open 10mm and another one 9.5mm then what is the difference worth at the end of the day in life expectancy.

what is needed is a different PROFILE, a different shape.

regards

Taffy

Supermoto_Husaberg · Oct 5, 2004

Taffy,

The 08 cam has MORE duration but LESS lift.

I think I'm getting a bit complex but isn't it the area under the lift / angle graph that determines total flow ?

Didn't the 03 bikes make more peak power than the 02's ?

Tuners keep telling me to get an 08 cam to improve top end on my 02 650.

Lloyd.

Taffy · Oct 5, 2004

sorry1 wnet and checked DL's other graph and got me '01' and '08' muddled up there!

dale knows what the husey engine likes and needs but i once had a high lift cam that gave more torque!

it all depends on valve sizes and port dimensions etc as to what an engine needs. sometimes there is absolutely no use in having a high lift cam if the ports and valve sizes are the same/and the restriction!

sorry about that

Taffy

PowerFiend · Oct 5, 2004

LINEAWEAVER said:
The improvement will be marginal as acceleration and jerk characteristics remain excessive with the 08 profile. You will also sacrifice peak power in addition to decreasing the useable power range.

Dale,
The above statement contradicts what you have posted previously. Which is correct? The following thread has the following quotes:

2004 Camshafts

OEM camshafts 820.36.010.000 and H-200.342.08 share identical profiles. The later unit is shipped with a matched auto de-comp lever.

Both camshafts will deliver near identical power characteristics to that of my X1 and in some instances provide for a broader power spread.

~and~

The X1 Camshaft is not particularly well suited for smaller displacement engines operating in the lower rpm regions and / or those equipped with restrictive exhaust systems. The X2 is a more forgiving and user friendly option. However, if peak power is your objective the X1 will not disappoint you.

LINEAWEAVER · Oct 5, 2004

Am I bad

I became a bit befuddled in a vast sea of OEM KTM part numbers. The 08 profile is as I had stated in an earlier post and will indeed provide for an increase in peak power over that of the 53 albeit valvetrain loads are still considered excessive.

Dale

t-jet-tim · Oct 13, 2004

Are oversize valves available?If so you can then run a milder
cam and still make the same horsepower.

PowerFiend · Oct 14, 2004

t-jet-tim said:
Are oversize valves available?If so you can then run a milder
cam and still make the same horsepower.

04/05's should be able to run the kibblewhite 1mm oversized KTM valves. The 01-03's may benefit from bigger exhausts, but can't imagine they would benefit much from larger intakes. They are already 37mm vs. the newer 35mm.

I believe Dale has played with different valves, and should be able to elaborate on pros/cons.

LINEAWEAVER · Oct 15, 2004

I supply valves on a per order basis.
Imagination and / or budget being the primary limitation.

Example #1:
40 mm head / 5 mm stem.
Stainless and Titanium available.

Kind Regards,
Dale

[email protected]

Rocker Follower Life: 53 cam vs 08.

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