CL175 dyno results

These charts show results from dyno testing the CL175 race bike at the Ducati Seattle dyno. Setup was:

#95 main jets
Needle all the way up
Keihin PE24 carburetors with Uni foam air filters
Straight pipes, high CL style
Pertronix ignition module
92 octane pump gas
Engine .5 mm overbored
Too-large 14mm sparkplugs
Stock cam, no timing adjustments

The temperature was cool, perhaps in the low 50s.

This is a chart showing the best of two runs. The first run (DATA 3, in red) shows the engine's power as it rolled into the shop. The second run (DATA 6, in blue) is after making a small change to the ignition timing, advancing it very slightly (perhaps 2-3 degrees).

The descending line shows the air/fuel mixture ratio. 13-14 is ideal.

The rising line shows horsepower output. Further up is better. Torque is unavailable, as the RPM sensor was not being cooperative, and engine speed readings were completely useless.

Just the DATA 3 chart.

Just the DATA 6 chart (ignition slightly advanced).

Update June 29, 2010

I made an adjustable camshaft, and timed it out carefully to be exactly stock at 105° according to the Group W Racing cam degreeing instructions.

I brought the bike back to the dyno this spring, with the new cam installed. Here is the resulting change:

The denser, smoother line is the new run. The more jagged line is the DATA6 line from the graph above this one. The major change is not more power, but it is smoother power. I wasn't able to measure the stock cam before its gear was pressed off, so I don't know how much the cam timing changed.