01-10-2018, 06:40 PM
(01-10-2018, 04:19 PM)JonE Wrote: Dave - the first bit presumably to further reduce the percolation of warmth into the aircharge-stream walls?
I've ordered another pack of ebay Hong Kong grindstones...!
Well if removing the hot spot from the standard cast iron set up your pics show you will not see much if any improvement. That is because even though it reduces the charge temp it will only do this for a very short time as the cast iron exhaust/inlet combination will heat up and take you back to square one very quickly. So the hot spot helps with initial cold running. A larger carb in theory can flow more air/fuel but as the shape of the inlet is soooooo bad it will be marginal and thats assuming you have optimised the jet/needle.
Paul N-M