What are those supposed to do? Improve gas mileage would be my guess. I see them on e-bay, there is one on there now but it looks like a part is missing. I'm sure they don't do much if anything, I just thought about buying one and blocking it off and installing it for a conversation piece but I'd want all of it.
Here's a company flyer
Thanks Jay. The air heater is missing on the one on e-bay. If I see a complete one I might get one if I have any extra money.
It is a big vacuum leak. Because the advertising was well done and colorful many people fell for the fraud.
Corey, I see these units at swap meets but hardly ever see the heat stove or for that fact the linkage with them.
I used one for a while and could tell no difference. They are fun to look at.
I am no fizz-asist so I can't tell you how it works but here are some photos of one.
Oh goody, something else to restrict the flow of the fuel mixture!
It looks to me like it leans the mixture by adding heated air, increasing flow as the throttle is opened.
That bird strainer looks useful in there. I hate it when crows get ingested into my engine!
Here's an NOS one that I have that is a little different.
I used one for a while. Like Terry observes, it leans out mixture as the throttle is increased. It works OK, gives the engine a different sound at cruising speeds. The same principle as having a petcock in the intake manifold that can be adjusted to allow more air into the gas mix. Not good when accelerating but saves gas I suppose when cruising.