[Joshinator99]

Originally Posted by toohighpsi

The excessive cylinder pressure as a result of detonation dramatically increases blowby - quickly past the limit of the crankcase ventilation system. The very low tension seals that are on the LT engines can't handle much crankcase pressure and are the first to go (front seal then rear seal). On the engine dyno we monitor knock with two "old school" methods - a copper sound tube bolted to the block routed into the control room and a flow meter on crankcase ventilation. These two little bits of information go a long way to keeping the engine alive under the most torturous testing.

Adding additional crankcase ventilation will help to prevent the seal problem, but if it's caused by detonation, it's a nice warning sign that something isn't quite right.

I personally feel the factory GM oil separator on the Camaro does a great job. If I'm running more than a "pump gas" boost level (6-7 psi), I'd upgrade the hose that runs from the separator to the the throttle body to a larger diameter (one I use is 1/2" or 5/8").

Sorry Tim, you'll probably have to replace the seal, haven't seen one fix itself yet...

Great info, thanks!