Sunday, November 27, 2011

C110 racing cam

How can you get more power out of a C110 engine? Fit it with a racing camshaft.
Only one problem, racing cams are not really available anymore.
I've seen some adds of old american aftermarket suppliers that had cams for Honda's including the 50/55cc OHV engines, but have never run across these camshafts for sale anywhere.
Luckaly my dad has some experience in making his own camshafts.

The C110 camshaft in line with a BMW R50S camshaft that will provide the profile.

Grinding stone, grinding away the C110 camshaft, this will result in a smaller ground cirkel, but also a higher lift and longer duration.

Finished product, the intake cam is reground, looks small next to the original exhaust cam, but because the groundcirkel is smaller, it is actually an inprovement.
Already made a testrun and you can feel the extra power in the higher revs without losing a lot lowdown.

C110 cam lift profile (not valve lift) compared to some others, the intake cam is now reground to the profile marked 50s,69s, clearly visible that it improves lift and duration.

Thursday, November 24, 2011

S90 oilcooler hookup

The 100cc motor I've been runnning this season has the tendency to overheat after a few laps, So even though I like the empty looks of the frame, I will be fitting an oilcooler for next season.
To look at the options, I started drilling into an original headcover, it had a broken fin anyway, so nothing was lost.
But it turned out pretty well, I have my oilcooler hookup now.

The top oil line runs up because that was where the broken fin was.

I think the new motor wil really like this, as it has a topend based on the ATC110 with cast steel cilinder, something I want to put together over the winter, you can see what it will look like mounted on the empty motor here:

this will become a 122cc motor with CT110 crank and 56mm piston.

Monday, November 7, 2011

What's wrong??

The other day I just felt like taking some pictures.
I'm not satisfied with the way my SS50 looks now, something about the totall package that just doesn't feel right, but I can't really put my finger on it.
The line of the tank and seat isn't straight enough, or the swingarm is too short, front forks too long.....
Or should I just put original handlebars back on?

long time no blog......again

Been busy at work and with a lot of different stuff.
My car needed some work, but now I've got brakes again, quite a nice "luxury"

Also took an old CB72 front wheel out of the corner, that before I bought it, had been laying in a field for 40 years.
Skimmed the drum surface just a bit, to hear if any rust had come between the lining and the castwork, but it still sounded good.
Japanese hubs don't have the problems that european sh!t have, but the rustpits in the brakesurface are so deep that a lot of material will need to be taken out, so only for use in a 50cc or 125cc bike. In a CB72 we overcook these hubs anyway.
Narrowed the hub to get rid of some broken edges, but it still needs finishing.

Will probably lace it to an 18" wm00 rim for use in ....... or sell it if somebody is interested.

On the left in the picture a CB750k1-6 carb, 28mm, now prepared for a 1cylinder bike, so I might use it on a 125cc SS50 engine I'd like to build.
Also completed a 26mm Cb77 carb for use on an SS50, just out of view as it is now on the 70cc engine in the background that I might convert to 85cc.
Just some other stuff I've been working on.