Slant 6 Turbo 68Dart Project
I figured it couldn't hurt to play with what I have here, so I decided to tear down the cheap blow off valve and wastegate. I wanted to make sure they will seal and be "bulletproof" so to speak - though not really. The blow off valve I'm surprised sealed at all and probably didn't. Nothing was straight. The wastegate was surprisingly clean and well built. The mounting flanges however, are nowhere near decked nicely.
The blow off was what I started with. I am going to say this, weather you buy this stuff new or used, but INSPECT the ebay stuff real good before you bolt it on. Take it appart if you have to.
Here's what's inside:
There's a diaphragm and 2 springs inside. The diaphragm attaches to the valve at the bottom via a secondary insert under the diaphragm. I noticed there was a small hole that went through the inner bushing in 4 places, then had a spot to line it up to a hole to outside air.
You can see it in the picture. I have no idea what this is for as it's vented to outside air when the valve is opened anyway. The only thing I can come up with is a flaw. so I sealed it. IF I can find a reason not to seal it, I'll redrill the hole before I install it on the car.
The flange part that mounts to the intake was (unsurprisingly) nowhere near flat at all.
In other news, neither was the face that seals against the diaphragm. I flattened both against a flat surface with some 400 gritt. Came out real nice. what you see in the pic is after I flattened it, before smoothing it out.
The air horn that attaches to the valve had an O-ring on it. I saw no purpose in it, but did notice the horn was only hand tight. Upon trying to tighten it, the O ring expanded and failed. Ah, makes sense now. Crappy O-rings. I removed it and put fuel safe sealant around the threads and tightened it down good. It doesn't necessarily need to be sealed at all, but this may help keep it from unscrewing due to vibration in the future.
Once it was all set, I cleaned a casting flaw off of the top cap that holds the spring in, repainted it and let it dry and then reassembled. I'll test it out somehow to see if it holds pressure. Hopefully it's just good to go.
Don't worry, I wiped the dirt off the fresh paint. lol.
I disassembled the wastegate, which was surprisingly clean.
The diaphragm and everything still functioned and the surfaces were smooth, except for where it mounts to the piping. Those were way off, but a simple flattening fixed those up. The exhaust sealing valve is still nice and seals against the bushing well.
I figured it couldn't hurt to play with what I have here, so I decided to tear down the cheap blow off valve and wastegate. I wanted to make sure they will seal and be "bulletproof" so to speak - though not really. The blow off valve I'm surprised sealed at all and probably didn't. Nothing was straight. The wastegate was surprisingly clean and well built. The mounting flanges however, are nowhere near decked nicely.
The blow off was what I started with. I am going to say this, weather you buy this stuff new or used, but INSPECT the ebay stuff real good before you bolt it on. Take it appart if you have to.
Here's what's inside:
There's a diaphragm and 2 springs inside. The diaphragm attaches to the valve at the bottom via a secondary insert under the diaphragm. I noticed there was a small hole that went through the inner bushing in 4 places, then had a spot to line it up to a hole to outside air.
You can see it in the picture. I have no idea what this is for as it's vented to outside air when the valve is opened anyway. The only thing I can come up with is a flaw. so I sealed it. IF I can find a reason not to seal it, I'll redrill the hole before I install it on the car.
The flange part that mounts to the intake was (unsurprisingly) nowhere near flat at all.
In other news, neither was the face that seals against the diaphragm. I flattened both against a flat surface with some 400 gritt. Came out real nice. what you see in the pic is after I flattened it, before smoothing it out.
The air horn that attaches to the valve had an O-ring on it. I saw no purpose in it, but did notice the horn was only hand tight. Upon trying to tighten it, the O ring expanded and failed. Ah, makes sense now. Crappy O-rings. I removed it and put fuel safe sealant around the threads and tightened it down good. It doesn't necessarily need to be sealed at all, but this may help keep it from unscrewing due to vibration in the future.
Once it was all set, I cleaned a casting flaw off of the top cap that holds the spring in, repainted it and let it dry and then reassembled. I'll test it out somehow to see if it holds pressure. Hopefully it's just good to go.
Don't worry, I wiped the dirt off the fresh paint. lol.
I disassembled the wastegate, which was surprisingly clean.
The diaphragm and everything still functioned and the surfaces were smooth, except for where it mounts to the piping. Those were way off, but a simple flattening fixed those up. The exhaust sealing valve is still nice and seals against the bushing well.
