The Brits have fought back against their German rivals as the opposing sides continue to play around with their respective Quattrini small block Lambretta engines. Over the weekend Chiselspeed have sent us this video and a Dyno of their tuned small block engine. Power has increased to a very healthy 32.5bhp and 20ft lb of torque, figures we couldn’t even imagine seeing from a road going small block engine a few years ago. Those figures were helped by the use of a 60mm crank, some welding to the transfer areas and a higher-revving CST 11 exhaust, plus a few two stroke secrets.

 

You can check out the original 24bhp ‘bolt on’ Chiselspeed Quattrini demo scooter and road test we reported on before Christmas here).

 

 
 
Red line on the graph shows Quattrini before tuning, blue is after tuning and with 60mm crank and CST 11 exhaust fitted.
Red line on the graph shows Quattrini before tuning, blue is after tuning and with 60mm crank and CST 11 exhaust fitted.
 
 
How’s the power made?
 
 
When asked how they’d gained some extra horses, Martin Cook at Chiselspeed was cagy and said “That would be telling, and you don’t seriously expect me to hand that to the opposition on a plate do you? Suffice to say that we haven’t gone mad, as you can see by where it is making peak power and the nice flat 2,000 rpm wide maximum torque… Bring it on those Germans. One thing I will say is that we have done what they have done and enlarged the transfers on the casings.”
 
 
Is this the same engine we tested before Christmas? “Different motor, we didn’t want to wreck the other one. We are into uncharted territory with this cylinder, it doesn’t respond in the same way as most I have worked on but we are getting there…”
 
 
 
One thing is for sure, this won’t be the last you’ll hear about it. We’ll keep you updated…
 
 
Iggy
 
 
 

Buying from the SLUK Shop helps to support this website