http://www.x386.net/TTR/tech/cam.html



edit: Link fixed, sorry

 

^^^^^link doesn't work^^^^^^

 

How much you know about the cams? I ve had tb, drtv s stuff z28, crower g2...never the takagawa or kitaco stuff though..I need a nasty mid/top cam for my lifan head. Im looking at a z40, never had one.

The TB cam will do the trick for mid-top on that Lifan.

 

hell no get the z40

 

hell no get the z40

I could of guessed this was coming, I know you love this cam. The TB cam has good lift - 6.99mm for both intake and exhaust, with 230 deg of duration on both as well.

 

just to let you guys know the tb cam DOES NOT have 6.99mm lift it has 6.78 and the z 40 has 6.70. i have a desk full of cams and have degreed and micd everyone. i was not barking at you Mark you are a cool cat. i will say for the money the TB is by farrrrrrrrr the best for the money.

 

Dude its no problem, I think we should all discuss the details more, as the Lifan head is starting to show up more and more as people are asking for it on builds. Compare cost vs. performance, but performance per riding style, motard vs. dirt, etc.

 

well i am testing a one off akunar cam right now (330 degree) and i have a crower #18 for the lifan in route that i will be testing but i road race so high rpm power is what i want.

 

I too have a bin full of cams. My TB race head cam has .275" intake cam lobe lift and .264" exhaust lobe lift. That's where Kurlon's spec comes from.

 

Cool, I have some cams I just got in from Sweden and I will get up some pics and specs asap.

 

Here is the new one we have been messing with.





Std Cam vs. Tuning Cam

6mm lift 7.3mm lift

0mm 300 dg 330 dg

1mm 196 dg 236 dg

1.27mm 190 dg 224 dg



Threw it on my desk quick and snapped a crappy pic.

 

high lift, low duration... nice. Help hp without hurting torque.

 

yea and killing your topend performance.

 

Only to a certain extent. Do you know the number one mistake when selecting camshafts for performance engines? Over duration. Don't get me wrong... duration helps top end. That doesn't mean low duration will kill top end though. We both know it's all in the application.

 

Like I said, lets compare berm blasting to knee dragging, or rider skill.

 

i agree bud, since i am road racing my application is totally different than you dirt guys. hey again congrats on the kitaco engine build.

 

i agree bud, since i am road racing my application is totally different than you dirt guys. hey again congrats on the kitaco engine build.

Thanks. And I'm thinking I'll wait for my new cam to get here before I put it back together (incredible lift AND duration). Maybe I can put something together that would work on the cement.

 

I'm going to start redoing the cam table to try and clean it up a bit, as well as listing whom's providing cam specs. (Time to give Cyclerider more credit.) Are there any other numbers I should be listing? I know from looking at Ducati cams in addition to lift and duration you can usually get valve acceleration numbers and graphs of cam profiles. I dbout we'll ever get that fancy, but I can include room for that info if people think it's worth while?

 

50 cam manufactures don't even know the ramp rate specs so aside from specing every cam we come across I don't expect us to get that info. lol.

 

Keep going boys. Im learning.

 

I used to do that in CAD class before I even knew what was going on. Anyway, what are the specs on the Z40?

 

well this is what i cam up with when i degreed it 6.69mm lift 249 degree duration. the trailbike cam was 231 degree

 

I did the measuring for the TB cams for his website. I'm working on measuring a couple 110 cams as we speak. Just to let you know, the specs advertised on Crowers web site for his GPX G2 cam are false, not even close.(I find it very unusual he lists the same specs for many of his cams)I'd like to check more of them. Kurlon if your interested I can send over what specs I have.

And the super long duration cams can definately kill your lower end power. Maybe ok for roadracing but not in the tight stuff.

 

Yea the high long duration cams are great for dyno runs or drag racing but not for any type of get out of the corner racing.....Motard/dirt...in my eyes..



Alot of these guys roadrace and call it motard racing.....so the Z40 and similiar cams work fine but in a real slow corner situation smaller is better.....



I have a +R head and have tried the 35,20,12 cams from takegawa and my bike runs the best for MX with the 12 cam...which makes the least HP on the dyno....but gets me out of the corner or off the holeshot a hell of a lot faster than the dyno king 35 cam with more lift and duration....



I proved it by gtting the holeshot over alot of different 124 Takegawa kits and SE kits and even a dual overhead cam 124....My +R is on a 54 x 52 setup (119cc) with the short cylinder(63mm) with a short intake 24mm carb and big bore(which is one of the smallest and not stepped) FMF pipe...The head is ported to the gills by RKMotorsports and with the small carb,cam,pipe this engine really rips.....Oh yea Hackmunches 146 with akunar HCP, Z40 cam was on the line also.....



Bigger is not always better....at least not everything being bigger..= velocity

 

Your holding on to this holeshot like a 5 year old girl on christmas when she gets her first barbie doll. Holeshots dont prove a whole lot other then you have a little hp and you let go of the clutch first. let it go