Last year I got hold of a GS dual snorkel air cleaner housing and put it on the Centurion, to replace the old sipper straw version. Only later I noticed that the doors weren't fully opening after warmup. They open about 1/2 - 3/4 inch (certainly all the way when vacuum is dropped at full-throttle. I internally plugged the line, so it would look like it's set up. Only, I'd really like to have them completely functioning, since BBBs tend to really struggle during warmup. I'm pretty sure the sensor in the air cleaner is good. Wonder if the manifold sensor needs to be a different one?
Sounds like the doors are functioning completely normally. One end of the sensor gets full manifold vacuum, the sensor modifies the vacuum signal and opens the door enough to keep the temp in the air cleaner at about 115*. They normally don't open all the way until wide open throttle. There's nothing wrong with the system IMHO.
Without holes in the hood, aren't you much better off with an open element type of air cleaner, anyway? You're still getting warmer, under hood air, instead of comparitively cooler, and therefore more dense, outside air, so why stop at two small openings in the air cleaner? I don't understand
Thanks Larry. I'm probably getting enough air with them partially open. Just thought I'd check with others to see if that's normal. Well, Chris. Three reasons for not going with an open element. 1) warmup functionality, 2) noise, 3) I like the look of the housing. Without racing, I probably don't need the extra flow of an open element. The single straw opening was maybe a 2" radius (it had to be starving for air - especially with the dual exhaust), versus having two much larger openings. The plan is to ultimately duct them to the front.
