40DCOE Secondary choke modification - Alfa Romeo Bulletin Board & Forums

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post #1 of 2 (permalink) Old 02-18-2017, 04:44 PM Thread Starter
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40DCOE Secondary choke modification

Anyone with older 40DCOE's that need secondary chokes are probably aware that the Spanish 40 secondaries are retained differently than the spring-in-the-channel method of older Italian 40DCOE's. Often one ends up with "slide-in-velocity-stack" secondaries, rather than needed flanged-style use with cold air boxes or air cleaners.
See photo #1. Flanged type left, slide-in-stack type right.
There are several methods that can be used to seal the big gap if you need flanged, but have stack type. I have been making "flanges" from PVC turned on my lathe. These are pressed onto the non-flanged chokes when partially machined, then finished on the choke. This is a 100% no-fail solution for the resoulte Weber builder with a lathe.
Finished chokes are pictures #2 through #5 below.
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post #2 of 2 (permalink) Old 02-18-2017, 07:07 PM
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