Well, it's happened. After finally getting my 550 injectors, true 3" exhaust ect my compression took a dive(cracked ringland is my guess) after running 10lbs for 4 months. I will say I have driven the car hard and it's made great power considering the 175rwhp it made stock but I didn't expect it to go so early on. I had no detonation and always kept the car under 12:1 air fuel. Since adding the injectors I have sprayed only water for cooling and think this may have contributed to the piston/ring failure. I'm almost positive that if I had kept running the methanol the pistons would have stayed cool enough to hold together but it was just costing me too much since I do drive the car hard A LOT. Guess I'm spoiled after owning a 94 Supra with single turbo GTE which was my inspiration for purchasing the GS.

My plan now is to start building up the ultimate short block setup and then eventually do some head work. I want to stick with the VVTI because I love the sound and spool time But I want to patch the motor up for the mean time since its my daily driver. So my question is, has anyone dropped stock TT pistons/rods in without pulling the motor? I talked to someone who mentioned it may be possible by dropping the oil pan and pulling the head. I want to keep the down time to a minimum until I can the second block and upgraded transmission funded and built.


Thanks guys,
Chris

 

Mmmm......you technically could do it but it wouldn't save that much time really.... The oilpan would need to be removed, in order to do that you have to raise the motor up a considerable ways. At that point you might as just pull the motor and do it the right way with the engine on an engine stand. It's not a big deal to pull a Gs motor, I can do it in under 3 hours easily. If you just have a cracked ring land you could just drive the car as it is (not ragging on it however) until you can build your next motor. I don't know your setup but if your on stock GE pistons and rings it's probably your rings that are worn thats causing the issue, what was your compression reading? Did you test the rings to see if they were the cause assuming that's how you decided it was ring lands.

 

Thanks, I'm still on stock pistons and compression. I have not done a compression test but I had a good friend who owns a shop take a look and he agreed and said its most likely the ring land as they are the weak link along with the rods if no detonation has occurred.

My friend and I came to the conclusion due to what almost sounds like a "camming" at idle and lower rpms along with some white smoke venting from the rear valve cover vent and dip stick when I pull it(blow by).

The car seems to be running well enough to drive and my friend who looked at the car also mentioned I would probably be able to drive the car for awhile as is, but I would like to get back to boosting asap. I also have a pretty long commute each day and don't feel real comfortable driving the car like it is for long.

 

Well, try running a compression test to get some hard numbers....when you run the test, do one full test with as normal, then on the cylinders that are low, redo the test after dripping a few drops (just a few drops) of motor oil directly into the cylinders. Generally if the compression shows a sudden large increase than that generally means your rings are shot, if it still doesn't rise then you may have other issues (piston etc...).

 

Unfortunately no.

Eric