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Old 03-13-2015, 01:16 AM   #11
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Location: Houston, Texas
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Year: 1946
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You also need to make sure there is not a significant drop in pressure throughout the system. As I recall, something like 3% or so is what to shoot for but there are probably better minds than my own here on this part of the design. The CAC that came with my little 4BT is ginormous but tailored to the engine. I plan on having a custom built that matches it in terms of volume and area but is vertical rather than horizontal in layout. I need to do more homework before spending any money.
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Old 03-13-2015, 05:15 AM   #12
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Mine doesn't have one at all, and lots of them don't.
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Old 03-13-2015, 10:57 AM   #13
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Engine: Cummins 4BT
Rated Cap: 15
Not at all uncommon and they run just fine. The CAC does improve overall performance a bit and helps quite a bit to keep down the EGT's under a load or up a hill.

The effect of cool intake air can be surprising and really shows up on two-cycle engines. I used to race 2-stroke Forumula bikes and on days when we had "cool, fat" air...the difference was pretty amazing. And sweet. The added density is sort of like raising the octane of the atmosphere.
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