| Re: 30 dollar 12HP+ air foil? |
Subject: Re: 30 dollar 12HP+ air foil? by anesthes on 2009/12/17 14:05:13 Quote:
Actually CCV, which provides fresh air to the crank case should a negative pressure situation happen. Quote:
The circuit is integrated into the throttle body. Air enters from two places, 1) the front cup, and 2) the cavern that traces around the bores on some years. On most throttle bodies I've seen, this also extends into the area between the blades. Some points: 1) At WOT the air would be entering the blades, which would have a higher vac than the fresh air circuit, so I doub't it would even work at WOT. 2) The opening on the airfoil at the bottom, which provides air into the cavity behind it, which supplies the fresh air circuit is larger than the diameter (3/8") of the hose connecting to the fresh air port. (see picture attached). 3) Even with a functional PVC, take the fitting off the fresh air side on your valve cover and I bet you will have pressure, not vac. Even with the PVC sucking as much air as it can in the crank case, the motor has enough blowby that the crank case is somewhat pressurized. The fresh air supply does nothing. This is evident by the typical oil buildup around the gromet. Quote:
I can agree with that, but again, the negative pressure over the throttle blades would probably suck out the fresh air line, airfoil and all. It is not blocking the passage, Unless the airfoil was epoxied in. ? Add a supercharger to this combo, and you're really screwed. I always delete the fresh air circuit, and run a breather on the valve cover. And again, I said airfoils work well with blowers, and probably don't do much of anything on naturally aspirated motors. -- Joe |
