Performance upgrades.

[1985CB450_imp]

I found your cam thread and it looks like you picked up around 3 hp going from stock .297/.294 lift and 199*/212* @ .050 duration to .318/.312 lift and 220*/223* @ .050 duration.

Looking at only duration at the industry standard .050 the stock 199*/212* numbers are optimized for the relatively low 9.5-1 CR. Closing the intake early (199*) helps the motor build dynamic compression which contributes to the strong low end/torque performance in stock trim. Opening that up to 220* at the same 9.5-1 CR does not really help and I bet if you looked closely at the tq numbers below 5000 rpm you would see a slight reduction. Its absolutely imperative you match CR with the cam profile, this is the reason most cam comparies such as Comp, Crower, Howards ect will state a recommended CR along with their cam selections.

In the car world I had a Comp hyd roller very similar to your modified profile in my 1973 Camaro, it was 218*/224* @ .050 and was perfectly matched at 10.25-1 CR using minimum deck height, flat top pistons and alum heads





Same recipe of minimal deck height, flat tops, and alum heads with my 1969 Corvette, its got a little more cam at 224*/230* @ .050 but is matched appropriately with a CR of 10.5-1






Both run on premium pump gas. I've had the vette for 15 yrs now and just sold the Camaro after having it for 12 yrs and over 10,000 trouble free miles.

In the motorcycle world, my GS750 was hot rodded back in the 1980's. I ran multiple Cam Motion grinds out of Baton Rouge, La in it as well as a set of Megacycle cams in the .350 lift/240* duration @ .050 range at 11-1 CR. It ended up at 802cc and had a set of 36mm Mikuni's off an early GSXR1100 and a V&H Competition Plus 4-1 exhaust. It was a very strong runner that would keep up with the typical lightly modified 900/1000 cc bikes of its time.



I bought it new and at 50,000 miles I parted it out in the early 2000's and bought a new 2005 Bandit 1200. It qot the typical mods, my biggest mistake was going with a set of GSXR1100 cams at the stock 9.5-1 CR. I dialed back the cam timing to build more dynamic compression but ultimately hated it. Gutless down low and minimal top end increase for the effort. A set of stock bore 11-1 pistons fixed it and turned it into a different animal. A set RS36 Mikuni's were icing on the cake. It was very strong from 6000 rpm all the way to its 10,5000 redline



Both 16v Suzuki's had adjustable cam sprockets, the GS750 was run at the cam manufacturers recommended 110* centerline. I tried the B1200 at the same 110* centers but ultimately settled on a 104/106* combo that gave it a strong upper midrange without sacrificing top end.

Not trying to be a debbie downer but been there and done that...unless you do something about the anemic 9.5-1 CR you are simply chasing your tail for minimal reward. Couple that with being hamstrung by the tiny valves and 32 mm TB's the CB has...

I applaud your effort but at some point reality sets in...