Artofschiffy
Proven Member
- 70
- 6
- Mar 12, 2017
-
SFV,
California
After blowing my head gasket and learning more about my 90 TSi AWD, I have found a cluster of red flags and have some other questions I am looking to find answers to.
The bottom end of this motor was recently rebuilt by one of the previous owners. This is the original block from my 90 TSi AWD. Balance shaft has been deleted and I just discovered "63D" NA pistons while taking of the head. The notches on the intake/exhaust are different sized and from what I've read these are less durable and have a 9:1 compression ratio. No wonder why my compression was 178-180 throughout the 4 cylinders.. Am I going to be okay running with this bottom end setup?
The top end was a 2g head and a 1g intake manifold. No port matching or oil mods were done to it so I ended up buying a 1g head. I purchased the 1g head to replace the 2g head with and the only info I received was "ported, ss valves, aftermarket springs, and ti retainers". Well after doing research and taking measurements the head has dual valve springs and +1mm oversized ss nitride intake and exhaust valves. I believe the aftermarket parts are all from supertech. Head thickness is close to spec (5.2) and the surface is flat. Should I check for valve clearance and is this head okay to use with the NA pistons? Also something looks like it dropped where the head bolt washers go and has made a gash. Is this okay or do I need to take it to a machine shop? (pic below) Going to be installed with ARP head studs and felpro composite.
I purchased a bundle of parts pretty cheap from some guys that mainly sell used domestic parts. This is what I ended up getting: Quaife QDH8B front differential for dsm awd, new whiteline GVR4 racing springs, one camshaft, and 2x 1G heads (one fully assembled for probably a decade and the other was recently rebuilt but has no cam caps, crower springs, stock valves, but the surface appears do have been dragged on asphault aka paper weight). I may end up trying to sell everything but the heads but does anyone have this quaife front diff and would you recommend it? The camshafts are pretty rusted, could I even clean them up to have them running again? Don't appear to be stock, but I can't even get the cam gears off to see if anything was engraved by the dowel pins.
Biggest concern are the NA pistons and the built 1g head with oversized valves. What should I do about the pistons? Run it until it needs a rebuild?
Any info would be greatly appreciated, I just want my 1g up and running!!
The bottom end of this motor was recently rebuilt by one of the previous owners. This is the original block from my 90 TSi AWD. Balance shaft has been deleted and I just discovered "63D" NA pistons while taking of the head. The notches on the intake/exhaust are different sized and from what I've read these are less durable and have a 9:1 compression ratio. No wonder why my compression was 178-180 throughout the 4 cylinders.. Am I going to be okay running with this bottom end setup?
The top end was a 2g head and a 1g intake manifold. No port matching or oil mods were done to it so I ended up buying a 1g head. I purchased the 1g head to replace the 2g head with and the only info I received was "ported, ss valves, aftermarket springs, and ti retainers". Well after doing research and taking measurements the head has dual valve springs and +1mm oversized ss nitride intake and exhaust valves. I believe the aftermarket parts are all from supertech. Head thickness is close to spec (5.2) and the surface is flat. Should I check for valve clearance and is this head okay to use with the NA pistons? Also something looks like it dropped where the head bolt washers go and has made a gash. Is this okay or do I need to take it to a machine shop? (pic below) Going to be installed with ARP head studs and felpro composite.
I purchased a bundle of parts pretty cheap from some guys that mainly sell used domestic parts. This is what I ended up getting: Quaife QDH8B front differential for dsm awd, new whiteline GVR4 racing springs, one camshaft, and 2x 1G heads (one fully assembled for probably a decade and the other was recently rebuilt but has no cam caps, crower springs, stock valves, but the surface appears do have been dragged on asphault aka paper weight). I may end up trying to sell everything but the heads but does anyone have this quaife front diff and would you recommend it? The camshafts are pretty rusted, could I even clean them up to have them running again? Don't appear to be stock, but I can't even get the cam gears off to see if anything was engraved by the dowel pins.
Biggest concern are the NA pistons and the built 1g head with oversized valves. What should I do about the pistons? Run it until it needs a rebuild?
Any info would be greatly appreciated, I just want my 1g up and running!!
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