ECR Posted May 5, 2020 Share Posted May 5, 2020 Just browsing Premier Powers web site and see that they offer a shaftless butterfly system for their throttle bodies. I'm familiar with slide throttle, roller barrell and conventional butterfly throttles, how is their system different? Is it the case that there is no shaft running across the face of the butterfly? Just curious... Link to comment Share on other sites More sharing options...
Tazio Posted May 5, 2020 Share Posted May 5, 2020 Roger,Just ask SKC on here, Stuart Creswell, he is Mr Premier Power. Link to comment Share on other sites More sharing options...
oilyhands Posted May 5, 2020 Share Posted May 5, 2020 A friend made shaftless throttle bodies for Honda in BTCC, the throttle plate itself is essentially flat with the pivots diametrically at the outer edges , this gave an excellent profile across the throttle plate on full throttle, the surfaces of the throttle plates had micro indentations/wave forms like the dimples on a golf ball that created a thin boundary layer of air which reduced drag to an absolute minimum, airflow testing revealed there was no measurable difference between an open pipe and the same pipe with the carefully machined throttle plate on full throttle. The plates were machined from solid and gave some challenges in holding them while the surfaces were contoured. These were preferred to roller barrels since they give a more uniform airflow at part throttle and there was a significant weight saving.Dave Link to comment Share on other sites More sharing options...
ECR Posted May 5, 2020 Author Share Posted May 5, 2020 Ahh, as I thought, thanks Dave Link to comment Share on other sites More sharing options...
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