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The other reason he's wrong Posted by Ari [Email] (#2847) [Profile/Gallery] (more from Ari) on Thu, 14 Feb 2008 12:04:53 In Reply to: Check valve from PVC nipple to intake manifold, tz, Wed, 13 Feb 2008 22:09:18 Members do not see ads below this line. - Help Keep This Site Online - Signup |
You CAN get icing in balmy SCA. It ain't about sub-freezing Wisconsin weather.
At mostly closed throttle operation - typical for highway cruising or going downhill - the engine is operting at high vacuum. So you have air on one side of the throttle plate that expands greatly as it drops into the lower pressure just after the throttle. Gee, sudden expansion - that's how an air conditioner works! At relatively high relative humidity and a cool day, you can get throttle body icing. Now, the heat of the engine tends to prevent that.
But the PVC has nothing to do with icing or not icing. You see it on turbo engines, and you don't on NA engines. Or you don't on Turbo engines this mechanic has touched.
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