I picked up my 2009 re-worked race engine this morning! My original race engine was tuned and built by Chalky White at Replay Scooters. He had built it as a ( relatively ) conservative motor, with a broad spread of power. It served me well for my return to racing after 13 years away........ it was dyno'd at 24 HP which was enough to scare me anyway!
I met Chalky at Cadwell Park, and we had quite a long chat about the motor. He had built it with the intention of racing it himself, but never really got around to it but he was delighted to see someone out on the track on one of his motors.
So...... fast forward....... Chalky has had the engine for a few weeks and has re-worked the top end. We now have a new crank fitted, with a jap con rod. The Rapido barrel has been ported some more, with somewhat larger (!) inlet and exhaust ports and transfers, a new BGM stator is now providing the sparks, and is coupled with the Agusto Advance Retard box.
I collected it this morning. I took my frame down and we re-fitted the engine and then did the exciting bit! The Dyno Run!!!!!!
I think its fair to say both of us were well pleased with the outcome...... 3rd gear power run showed an increase in power to 31.5HP, with 20 maximum torque! We have a real broad spread of power which will suit my riding style
I'll publish the dyno results and printouts in a few days when I have access to a scanner,
but in the mean time.....
7000 revs produces 25HP
7700 revs produces 30HP and peak torque (20.7)
8158 revs produced peak power 31.5HP
9000 revs is still producing 30.6 HP
9500 revs still 26HP
so as you can see a nice broad spread!
Can't wait to be helling down a straight at Mallory grinning and squealing!
~~~~~
Dyno Chart!
