Recently on my TWM 8 stack I noticed a strange sound on deceleration. It was a ppssst type of sound and was like a backfire without the popup through the injectors on the front left injector. In searching for the source, I would put my hand over each injector to feel for anything unusual. What I found was that all the cylinders but one, would pull your hand down on the bell and if you had a rubber glove on it would make a screeching sound as the air went by the glove. On the left front cylinder there was little if any vacuum. As I woud pull the throttle linkage barely open I was seeing fire just beneath the throttle valve on this one cylinder. I pulled everything down on the intake and noticed a black soot mark on the outside bottom of that very cylinder. Looking down into the port you could see the edge of the gasket(felpro) which had ben trimmed on installation. The AFR 205 heads have a very large pasageway and I had to grind away a lot of the intake runner to get a match. Looking at the the outside edge of the intake and head joint it looked like the gasket was installed a tad low. On the opposite head, the gasket is showing across the mating line. In looking at the front of the engine I used RTV sealant for the mating surface around the distributor. This area looked like it had dried out and may not be sealing the corner of the block/head/intake. Taking off the intake is going to be a major headache. I have tried a novel approach to seal these areas. I used hot glue to seal all of these surfaces. Will be firing the engine up soon. Just have to finish reinstalling the parts. This is one of the hardest installs there is. Most of the interior nuts bolts and things have little to no room to install them. You have to use a magnet wand to install the washers and nuts and bolts. Then a standard socket can tighten them down.
What I am worried about is that the leak may be on the inside runner of the intake, which would involve removing the intake. Does anyone have any suggestions on a way to seal that part of the intake runner without removing the manifold?? I envision gluing some sort of rubber liner to the runner to seal it. Any thoughs along those lines?? Appreciate any help possible.
Bill
What I am worried about is that the leak may be on the inside runner of the intake, which would involve removing the intake. Does anyone have any suggestions on a way to seal that part of the intake runner without removing the manifold?? I envision gluing some sort of rubber liner to the runner to seal it. Any thoughs along those lines?? Appreciate any help possible.
Bill