KIWI Mk2
I/C ENGINE BUILD
Part 25 By Vince Cutajar
KIWI Mk2
I/C ENGINE BUILD
Part 25 By Vince Cutajar
Before continuing work on the carb body I needed to do the banjo connector and the fuel jet housing. These would determine how much more milling was needed on the carb body.
I fabricated the banjo connector from two pieces of brass. First I did the circular part which was simple work on the lathe. Then I did the straight part on the lathe but drilled the through hole 0.5mm undersize (2mm).
Put the circular part in the vice and plunge drilled with a 5mm slot drill. I did not go all the way through the banjo. Applied some solder cream at the bottom on the plunged hole. Pressed in the other part of the banjo and applied heat to the part. I then started threading 6 x 0.75mm. I then drilled the hole for the banjo 2.5mm which cleaned up the solder that might have gone in the hole.
First off I needed to make a 1/16" groove where the banjo will sit. So I used a 2.5mm drill which had the backside ground to a point to use as a transfer punch, put the banjo in the jet housing, and with this transfer punch scratched the housing where the groove should be.
I then cut the groove but the plans do not specify how deep the groove should be, so I made it to a depth of 0.75mm.
Inserted a 5mm rod in the carb air inlet and used this rod to measure the angle. Then drilled and tapped and milled the platform where the banjo will sit. This operation was done repeatedly in small increments until the tip of the jet just appeared in the carb air passage.showing the jet assembly screwed into the carb body. Left the carb in the vice so that next time I could mill out the small defect in the casting that is evident in photo.