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Old 1 Week Ago
the cowboy way's Avatar
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Default Intake manifold

Im building a 1974 XL
It came with a cast iron intake manifold
I want to run a aluminium one (I found in my parts stash)
Because I can polish it
Opinions, pros - cons
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I think as long as you have an insulator between carb and manifold it won’t pose any problems either way. What carb?
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if it is a cast, does not polish well. use fine grit and lite pressure as soft aluminum will streak gouge easily.
wear a mask if you do not want a nose full if aluminum.
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kitabel kitabel is offline
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It will still absorb some radiant and convection heat from the head but not significant.
You can blend in the radius inside the back wall to improve flow a bit.
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Sportster/Buell Model: hand built M/XL ironhead
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Quote:
Originally Posted by doodah man View Post
What carb?
Bendix
I have 2 to (hopefully) get 1 good
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do not waste your time polishing the insides, intake actually does better with a little roughness, the exh side does better. main thing is that the port to port lines up well, which sometimes requires you to loosen the heads.
the vm round slide mikuni works wonders here, i run the 38mm but should have installed a 40mm. kicking butt since 1975.
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do not waste your time polishing the insides, intake actually does better with a little roughness

Who must be wrong:
Jerry Branch
Dick O'Brien
Clyde Denzer
C. R. Axtel
dynamometer
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Quote:
Originally Posted by kitabel View Post
do not waste your time polishing the insides, intake actually does better with a little roughness

Who must be wrong:
Jerry Branch
Dick O'Brien
Clyde Denzer
C. R. Axtel
dynamometer
Those old grey breads were wrong . We now know a rough finish is preferred and it hasn't been a secret for at least 20 years.
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needspeed needspeed is offline
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I recall reading an article many years ago where Branch said he knew that the high polish wasn't really effective but he did it anyway because customers were so impressed by the way it looked.
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very hard to tune a short intake with one hell-of-a reversion when the intake closes, flow pretty much stops for a milli-second or so. sticks burn better than logs so a little roughness helps break things up.
now if you have to remove material from either side to get a very good alignment, go for it. however, most really do not care and the ole iron putts on merrily for over 1/2 century.
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