Intake manifold as a filter? - Saab 900 Bulletin Board - Saabnet.com
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Intake manifold as a filter?
Posted by MS (more from MS) on Wed, 20 Mar 2002 19:10:02
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The other day when I pulled my intake manifold off, it had been a year since I last pulled it. That time before I gave it a good cleaning inside the individual port channels, which were thick with crap. They probably had never been cleaned since leaving the factory. After a year's worth of use I noticed some stuff again accumulating along those individual channel walls, as well as on the inside near the throttle chamber. The throttle chamber also had some gunky accumulation. I again cleaned as much as I could on all parts. What I've noticed both times I've had access to the cylinder head intake ports is that the area inside is very clean. The valves themselves look spotless - and this after I installed an EGR valve (9 months ago) where there was none in all the years prior. Oh but there was plenty of black crap originating near where the EGR valve attaches to the bottom of the manifold. By design, are the throttle chamber and intake manifold meant to act as an accumulant for oily gunk and dirt? I do know that plenty of oil does make it's way into the intake system by way of the turbo, but it pretty much accumulates along the intake manifold walls and appears to go no further. Of course, the gasoline which saturates the intake valve area more than likely is what keeps that specific area clean.
Any insights?
posted by 205.188.19...
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