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ET: Engine (Twin) Amal Concentric Mk1 with 3.5 slides

craig

Well Known and Active Website User
VOC Member
I have my 1947 Rapide being set up with Amal Premier Mk1 928s with 3.5 slides and need help with initial slide set point.
I have been looking at Nortons for too long and have forgotten my Amal experience on Rapides.

Is not there a drill bit size I can use for initial slide set point?

Amal928_StartPointDrillBit.jpg

928 Premiers, 190 mains, 928/060DA-3.5 slides, 622/502-19 - .019 3 ring, 622/122-106 needle jets, 622/124 needles middle groove, mix 1.5 turns out. black plastic floats set level with bowl edge,
 
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John Reynolds

Active Website User
VOC Member
The normal initial setting for Amal slides is 1/16" clearance measured at the engine side of the slide. This setting is made before the carburettor is attached to the engine/ carb adaptor. On the 3 1/2 slide, the cutaway is 7/32", so the drill bit required as per your illustration will be 9/32"
 

craig

Well Known and Active Website User
VOC Member
Thank you John, I will start at 1/16" or so.
In all my looking around at Amal rebuilding websites I don't find any reference to this 1/16"slide setting or actually any slide setting at all. Plenty of info on slide dimensions and cutaway sizes and part numbers.

cutaway-modifiedcolorweb.jpg
 

craig

Well Known and Active Website User
VOC Member
I found that 17/64" or 0.262" drill bit to be the best point to start the 3.5 slides with 928 Premiers.

928 Premiers, 190 mains, 928/060DA-3.5 slides, 622/502-19 - .019 3 ring, 622/122-106 needle jets, 622/124 needles middle groove, mix 1.5 turns out. black plastic floats set level with bowl edge,

Just shop tune with air fan for cooling for the time being.
Oh Yes, and electric start!

 
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