Eddie's 1998 Grand Prix GTP - Engine Rebuild

Eddie's 1998 Grand Prix GTP - Engine Rebuild


Welp, it finally happened. After about 138,000 miles, a popped a piston. Here are some pictures of what happened, and some while removing the engine. I hope to have some more pics from the rebuild, head porting, and reinstallation, but sometimes I forget to snap pictures!


Engine Specs...

Here is what I've done for the new engine. I hope to drop my 1/4 mile time in to the high 12's with about 300 or so HP at the wheels (close to 350 at the flywheel)


Here some pics of the new stuff...





The Damage

I was merging on to a highway hard. I wound out first gear, and let off just before it went in to second. Looking at the scan, the engine was running lean, and the knock sensors were not working - this is why the damage accured.


Pulling the Heads and Removing the Engine

I pulled the heads first because I was not 100% positive that I hurt a piston.



Reassembly - Day 1

Install crank shaft and pistion rings (I forgot my ring compressor at work or the pistion would have been in as well)



Reassembly - Day 2, sort of...

Upon installing one of the pistons, one of the small oil rings got twisted so I have to wait to continue untill I get a new ring.



Together and Installed!

Finally got the oil ring! Put it together and installed it during the next 2 days. When I started it, the oil light flickered and stayed on (gasp!). I installed a manual oil pressure gauge to see it had between 55 and 75 psi depending on engine temp and speed - installed a new oil pressure switch and all was good.



Sound and Video Clips

This is what the engine sounds like now - pretty good if you ask me! The vid was taken before any tuning was done, and right after the first test drive of about 10 miles. Idle speed was raised 100 RPM, it has since been lowered to 50 RPM over stock.

Here's a clip on the day I got the car running

Here is a sound slip of the exhaust in gear witth the A/C on, in gear with the A/C off, and in Park

  



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