Here's what I wrote in my article: Racing Arnolt Bristols.
The BS1 Mk II engine in the Arnolt comes with Solex 32 BI carbs (no pumps). The first improvement was to flatten the throttle shafts to increase the area for more air flow. The car performed best with 140 main, 240 air correction and 60 idle jets. The venturis were 28 mm. One of the problems is the wear around the throttle shafts which causes poor idling but has little effect at speed. A similar carb is on the Volkswagen Beetle and that is a source for gaskets.
Note: The significant difference between the BS1 Mk II and the 100 D2 (Which I had one of) is the better crankshaft in the 100 D2.
Last edited by briwmw; 18-11-16 at 05:20 PM.
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