Another Cam Question / Another Choice Added

Would this be a good cam setup for a KZ900 with a 1075 street setup?

Thanks


Grind Lift: Duration: Timing: TDC: CL: Angle: Lash:

3x In .418 282 deg 37/65 .173 106 .004
Ex .418 282 65/37 .173 106 .004

Post edited by: austin3119, at: 2006/09/06 12:03

Our experience with that cam, it should be used with shim on bottom tappets. It has quite a bit of duration and will be a little slugish on the bottom end.

Jay

IMHO APE's 410 grind would be a better streetable choice,I think I read somewhere that they are the old andrews 8x grind.(short duration,high lift=loads of torque)

Jay, on another note have you ever thought of grinding the old andrews 6x-4x combo? that was a killer set back in the day for 1170-1260 motors. just a thought

It sounds like the 410 is the way to go and If I go new that will be the one. However, I'm trying to save some money where I can on this build up. So lets try another.
How does this one look?

420 Lift / 269 Duration at .040 / 262 duration at .050 / lobe center 110' / Event In 25/64 Exh 65/24 / base circle 1.110


Thanks

craigpuckett wrote:

IMHO APE's 410 grind would be a better streetable choice,I think I read somewhere that they are the old andrews 8x grind.(short duration,high lift=loads of torque)

Jay, on another note have you ever thought of grinding the old andrews 6x-4x combo? that was a killer set back in the day for 1170-1260 motors. just a thought

No. When Andrews quit the import cam business, we bought the masters for the 8X and 5X. They were the most popular. They became our K410 (the biggest you can run with the shims on top), and our K435.

Jay

Post edited by: APE Jay, at: 2006/09/06 22:17

Generally I would not recommend anthing larger than the 410 cams on the street - and even with these you lose a little of the bottom end power - although the motor does come alive over 5,000rpm - surging nicely to the redline (and beyond) esp. if you've got the carbs to feed the cams.

The matched set of components is the key. 10.5:1 pistons with 410 lift cams will not be that good if you still run 26mm carbs. Getting the ports cleaned up - possibly going to 37.5mm intake valves will help the motor breath.

Jeff what size carbs do you recomend with this setup?And what happens, negativly speeking, if yuo use too much lift or duration?

1100cc or under, 29mm smoothbores work well - very tractable on the street. A good set of 28mm carbs would be a decent choice if you don't want to spring from 29's.

The higher lift cams make more power at higher RPM - and usually lack performance under 4,000 rpm. This makes it tougher to ride around town

Once you go over 410 lift, you have to do much more work to the head - you must switch to shim under buckets, you also need heavy duty valve springs. You really need to get the head flowed. Potentially larger intake valves. The you dive into the rest of the engine - welded crank, heavy duty cam chain, beefed up clutch.

would 410's be a drop-in on a '82 1000, stock with with constant velocity 34's (jetted, of course)?

cary wrote:

would 410's be a drop-in on a '82 1000, stock with with constant velocity 34's (jetted, of course)?

Pretty sure You'd still have to do some clerance grinding on that head...maybe even the valve cover as well,but I'm not positive.

I use a roughly .380 lift with new springs and shim under buckets and a 1075 12:1 kit. Over 400 lift has issues listed above. The hot carb for me would be 36mm (drag race). I intend to use 33mm (running out of money). My 33's are 29mm GSXR carbs bored out.

cary wrote:

would 410's be a drop-in on a '82 1000, stock with with constant velocity 34's (jetted, of course)?

Not a drop in. Must clearance the tappet bore area ( not valve cover ) and use the VS900K valve springs. Also will not clear stock pistons. We never sold a drop in because for the money, we thought the performance increase did not warrent it.

Jay