US Canadian company Clockwork Racing Engines Inc. have released a trio of carburettor inserts (venturis) which they’re calling ‘Nitro-Mizer’- the inserts use reduced endpoint which they say dramatically increases runtime, yet has a small effect on overall power. Whilst limiting endpoints and training your throttle finger are well-known methods of improving runtime, Clockwork say that their ‘unique funnel-oval shape’ restrictor maintains adequate air supply to run strong whilst focusing the incoming air directly over the fuel outlet, thus creating a stronger signal and better overall atomization of the mixture.

“Regular small inserts typically used to reduce fuel consumption directs incoming air away from the fuel outlet and is known to cause a narrow tuning window. The patented pending football shaped inserts aligns perfectly with the end of the throttle slide, and presents less air disturbance and funnels the incoming air and focuses it right above the fuel nipple and gives a nice crisp responsive throttle and a normal tuning window.”

We have been testing these for the last couple of months and have had amazing results with a variety of engine types. We have seen runtime gains as high as 3 minutes on some engines, not to mention a stronger, more stable idle, and improved low end and midrange throttle response.

The most common response has been how “crisp and linear” the throttle has felt.  We will be offering these in a package with 3 different sizes as to allow the customer to tailor the throttle response, power-band, and fuel economy to each particular engine, track, and driving style.

Fits: Novarossi, OS, Alpha – Picco available soon. Blue: 4.8mm, Purple: 5.4mm, Orange: 6.0mm.
Retails @ USD 26.00  See Clockwork Racing