Andrew (thavidu) is going to need a place to keep all questions in order when it comes to keeping his new SCX on the road. I figured I would start the thread for him, and update you on the progress.
I originally bought this car in june of 08, the previous owner had bent all 8 intake valves. Not sure on the history at all but it has one aftermarket piston which seems to be from long ago as it is a 10:1 like the others. Anyways, I slowly worked on the car and rebuilt the motor with an 086 head and HO cams. The w41 cams were sacraficed for another motor. It also has a brand new cluch, and TO bearing.
It took me forever and a day, but I fired the car up today for the first time ever. It appears to be running on 2 cyl, which I suspect is a Injector issue from sitting. I had flushed the tank when I got the car and it now has some old premium from june of 08, so that is 18 months old. I plan on having the motor sorted out by tomorrow.
I ran the car and checked the temp on the exhaust manifolds to look for a dead cyl pair so I could chase down what I hoped was a bad coil or injector. But all CYL's were geting hot.
So I did a compression test. TC - 210-210-90-210 transmission
Not good. I am thinking that I may have bent intake valves on this when assembling it. My question is why is it geting hot on that cyl if its not got compression. I'm now hoping that the lifters on that cyl are not pumped up and that when it is running the numbers come up. All 4 plugs were severly fouled from the bad gas so I need to swap plug before doing any more testing.
here's to crossing fingers that you figure this out ~ and it doesn't need a tear down to fix!!
Yes, I know - I might have a problem... 1989 Grand Am LE coupe; burgandy, LD2/5spd(sold) 1991 Grand Am LE coupe; white, LGO/W32(written off) 1991 Grand Am SE coupe; red, LGO(sold) 1990 Grand Am SE coupe; black, LGO (pending purchase?) 1991 Grand Am LE coupe; red, LGO/W32
They were all equally hot, and gaining at the same rate. I guess I'll swap plugs tomorrow, and hope that running the piss out of it gets those rings to seat? Or makes it easier to pinpoint the problem by putting a lifter through the cam tower.
So this is still my car, and its been sitting long enough. I pulled the head today. The head looks awesome. Cyl wall looks good on the low compression cyl, but the transmission side cyl (4?) has score in it that I can catch my fingernail on.
At this point I know the motor is coming out and the block is going to the machine shop. No idea why there is low compression, but the piston rings seem to possibly be a culprit. Not sure what the PO did to the block, and apparently I need to know, because one cyl is bigger than stock rings I think and the other needs to be. No idea how the cyl got scored, it was not that way when I assembled it obviously. I think it may be the oil control ring dimensions.