SOHC.co.uk Forums > CB500/550

Cam shaft and rocker arm wear?

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K2-K6:
Shifting the cam timing like that shifts the torque peak to different rpm (usually upwards) with BHP a calculated number using rpm as multiplier, it appears to have higher BHP from the same engine.

It's an odd thing,  as torque is what pulls it along but BHP is often used as the big headline number that people are interested in.

It will go faster as in rpm the minute component brings a time basis to performance in that you'd gear it down to rev higher and produce more power pulses over the same distance you travelled (that's effectively what BHP means, workrate in time stated) but probably with exactly the same torque as you had before.

What it means;- you'll have to run higher rpm to match or exceed the std one.

Look at torque for a current 600 and compare it to these 550, then look at BHP and the rpm difference to illustrate the above. At 14000rpm a modern motor is packing far more power pulses into each mile and so it's faster.

alexdecker:
Wow, that price was better than I expected. I have written Newcams as well now  :)

murdock:
supongo que newcams trabajara en unos cuantos hondas esta temporada

I guess newcams will be working on a few hondas this season.

Oddjob:
Phil, just say you want 5 degrees more overlap and 10 degrees more duration and let them worry about it. It's the way the lobes are profiled, overlap is the time both valves are open at the same time, duration is the time the camshaft holds the valve open.

According to Mark it really wakes up the 500/550 engine, there are other little things you can do like making a pocket above the inlet valve, they always say "Don't lower the floor, raise the roof", and raise the exhaust ports about 2-3mm and smooth the port out. That's to aid the flow of exhaust gases as they exit the engine.

Sesman:
Thanks, Ken. That’s exactly what I was looking for.

I’ve already ported the head…nothing drastic, just smoothing matching and a slight raising of the roof. Basic fluid dynamics stuff. I was going to fit a 650 cam, but the opportunity didn’t present itself, so your 5/10 comment piqued my interest.

Not looking for remarkable gains, but I used the rebuild to optimise what I have. I’m pretty sure it won’t be worth the time invested, but it kept me off the drink and donuts for a while😊

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