Cams

[Swiss Toni]

I’ve been looking for a Katana1000 ex. cam. I’ve been offered a pair of 16v 1100 cams. The lobe height appears to be .5mm higher than the original. Would these work ok, with no piston/valve interface?

Edited December 6, 2021 by Swiss Toni

[denisd]

Interesting question Maurice, you would think that it should work but I'm sure someone with the knowledge will be along to enlighten us. 

[Swiss Toni]

I’m sure one of the guys will come up with the answer. 

[Gixer1460]

From memory the rocker ratio is 1.5 so that 0.5mm increase in cam lift translates to +0.75mm of valve lift. Unless the pistons had an excess of clearance, that increase may cause interference - only a dry build will give the answers! Sometimes you have to use what you can get and cutting an additional 0.5mm valve relief in your pistons isn't the end of the world!

[Swiss Toni]

@Gixer1460I’ve taken a chance on the 1100 cams. Do I use the 1100 cam wheels, or fit the 1000 Kat ones! 1100 or 1000 valve clearances/timing?

Edited December 12, 2021 by Swiss Toni

[clivegto]

I would use the 1000 cam wheels. To do it properly they want slotting so you can dial them in, this would also give you a safety margin to advance or retard them if valve to piston clearance is an issue. 

[Gixer1460]

2 hours ago, clivegto said:

I would use the 1000 cam wheels. To do it properly they want slotting so you can dial them in, this would also give you a safety margin to advance or retard them if valve to piston clearance is an issue. 

Agreed on the slotting (although I use slotted wheels on everything i've ripped into!) but using them to gain valve clearance is counter productive IMO. You slot the wheels to obtain correct valve timing - if that cannot be obtained due to interference, then cure the interference, don't skirt around the issue and compromise the valve timing.

[clivegto]

3 hours ago, Gixer1460 said:

Agreed on the slotting (although I use slotted wheels on everything i've ripped into!) but using them to gain valve clearance is counter productive IMO. You slot the wheels to obtain correct valve timing - if that cannot be obtained due to interference, then cure the interference, don't skirt around the issue and compromise the valve timing.

Yes agreed although the movement of the cam wheels could work to advantage the motors piston to valve clearance when set correctly.