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)
- Engine Block:
- Bore the block .030
- New hyperutectic pistions (.030 over)
- New cam and balance shaft bearings installed
- - Clevite 77 tri metal bearings for mains, rods, and cam
- Cylinder Heads and Valve Train:
- ZZP Comp Cams XP - Hot cam - Click here for a copy of the cam spec sheet
114 degree intake centerline and 116 degree lobe seperation
Intake Exhaust Gross Valve Lift .520" .536" Duration at .006 263 degrees 275 degrees Valve Timing Opening at .050 -8 BTDC 50 BBDC Valve Timing Closing at .050 40 ABDC -6 ATDC Duration at .050 212 degrees 224 degrees Lobe Lift .3250" .3350"
- Installed ported heads in Feb 2008
- New bronze guides
- New Si competition series stainless steel valves - 1.84 intake 1.60 exhaust
- Competition Cams 1.6 full roller rockers
- Competition Cams roller lifters
- ZZP oil prerssure kit
- Intense .083 push rods
- Pacesetter Headers with Armor*Coat polished 2000 Degree F metallic-ceramic coating
- Other new stuff to go with the rebuild
- New Delco water pump
- New Delco crank sensor
- New cam magnet for cam sensor
- 2 New Knock Sensors
- Autolite 104 spark plugs
- These things were reused:
- 72mm Ported Throttle Body
- 85mm LS6 MAF sensor
- 3.2" super charger pulley
- Custom cold air intake with Ram Air opening for use with hood
- 42.5# Lucas Injectors
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.
