97egl
Proven Member
- 721
- 445
- Feb 6, 2014
-
Brownsburg,
Indiana
I destroyed an engine in my 93 N/A car I had built it for enduro racing. Mostly stock other than I eliminated the balance shafts and ran ACL race bearings. I only made it 24 laps and the engine locked up solid. It did get hot, I hit 240 degrees so I started making my way to the top of the track to pit. It reached 250 before I got off and thats when it stopped running and locked solid. Oil pressure never dropped below 20 at idle and always 40+ while racing. I also never heard any rod knock. Once it cooled off it actually turned over and started again. i had 80PSI of oil pressure but it didnt want to stay running. Strangely enough still didnt hear a rod knock.
Tore it down and the #4 spun. I have parts to build another engine but before I put it together I want to make sure the same thing doesn't happen and I'm not really able to figure out why it spun. All the other bearings are scored up too. But I think that is from the bearing debris running thru the engine. #4 is the only one that spun. Got so bad the crank turned black from being hot and its bent as well.
I have a few things I've thought it could be but really have no definitive answers and I REALLY don't want to build another engine just to have it blow up. This isn't the first engine I've built by far but it is the first 4g63 so I'm hoping someone on here has some experience with building them to last on circle tracks. Enduro is different than drag. 300 laps of wide open throttle for the most part so it's pretty grueling on an engine, lots of heat, possible oil starvation in the corners and tons of windage in the crank case from oil splashing around.
Tore it down and the #4 spun. I have parts to build another engine but before I put it together I want to make sure the same thing doesn't happen and I'm not really able to figure out why it spun. All the other bearings are scored up too. But I think that is from the bearing debris running thru the engine. #4 is the only one that spun. Got so bad the crank turned black from being hot and its bent as well.
I have a few things I've thought it could be but really have no definitive answers and I REALLY don't want to build another engine just to have it blow up. This isn't the first engine I've built by far but it is the first 4g63 so I'm hoping someone on here has some experience with building them to last on circle tracks. Enduro is different than drag. 300 laps of wide open throttle for the most part so it's pretty grueling on an engine, lots of heat, possible oil starvation in the corners and tons of windage in the crank case from oil splashing around.