I was talking with a guy who is a tech at local shop today. They had been doing drag and street cars for a while, but are now doing some road racing. He mentioned that they were having issues, specifically with longer 30 minute sessions. Apparently, the oil is foaming and essentially grenading their 4G63 motors. Is this a known issue with the 4G63? Is this were a kiggly HLA comes into play? or is oil aeration a case by case basis?

Thanks

 

No, "foaming" isn't likely what's causing their issue directly unless they're generously overfilling the oil to the point where the crank is acting like a paddle wheel. Lack of oil, specifically oil pressure, on hard turns however will. I've tracked and raced my stock block for over 20k miles and it never failed, just got tired but still made power.

Generally lots of things will kill a motor, but they're all part of a series of failures so not really any "1" thing fails. Thus not any "1" solution can fix it either. If you think about it if foaming was a constant issue, all sports cars would have dry sumps. So to come at it as a system you'd want:

Wet sump oil pan or Dry sump system
Kiggly HLA, which is intended to keep "more" oil in the motor and not in the head.
FP oil line and filter for turbo, especially if you installed the HLA.
GOOD oil like AMS Dominator racing, Royal purple, Brad Penn, etc etc

If you're still lacking pressure you can always shim the oil pump but it may wear faster.

 

Thanks Balrok much appreciated.

It seems they have solved there issue by not revving to more than 7600 RPM. :/ I don't know that, that is a real fix.

I let them know about the HLA, as they were not using it, and they have just got the dry sump set up together. Hopefully that will help them out...

 

No prob. Sounds like they're skipping a bunch of steps but to each their own lol.