John posted our May El Mirage report; but the short version is: we ran the 50 with a turbo on fuel. It makes less power than normally aspirated for 90% of the rpm range then builds to a power peak at the rev limiter that is 25% higher (~ 6psi boost) . The streamliner with the sidecar went about 8% faster than the same set up without a turbo. The numbers are working exactly as predicted by a cubic function.
The motor survived 4 El Mo runs and appears happy. We didn’t data log the boost pressure during the runs but our dyno testing leads us to believe that the waist gate may allow the boost to creep upward. Durability at Bonneville is still a big question (we get to enjoy the long course for a several minutes at over 14,000 rpm).
Cylinders are hard to get; so we may turn the boost down for testing at the June El Mirage event. After the World finals it will be fun to lock the waist gate and see what it will do at El Mo.
Just finished the Bub paperwork; John will be going after the Blown fuel 50cc FIM record and I will use a CR80 motor (the “Big Block”) for an attempt at the normally aspirated fuel 100cc FIM record.
We heard a possibly unfounded rumor that the Motobcane factory is sending a 50cc streamliner to Bonneville this year….the guy that said it; had a thick French accent and was on a moped (at El Mo). Quite often we hear news that someone is building a small streamliner, but I if they do actually start construction; it appears that the volume of work stops them before completion.
Rocky Robinson gave us a write up on mototcycle-usa
http://www.motorcycle-usa.com/Article_Page.aspx?ArticleID=6462&Page=1http://www.geocities.com/buddfab/buddfab3Eric