Catch can options
Team Owner
Joined: Nov 2007
Posts: 24,035
Likes: 2,342
From: Gilbert AZ
I have good rings on a low mileage engine ... Do you think with a tight engine, such as mine, that my piston rings will allow so much combustion gas to pass by them at WOT / high RPM, that it will pressurize my crankcase enough as to blow out my crankshaft main seal?
Stock heads and stock cam LS3 with 7 PSI Boost
535 RWHP @ 6,300
Stock heads and stock cam LS3 with 7 PSI Boost
535 RWHP @ 6,300
Advanced
Joined: Mar 2017
Posts: 90
Likes: 20
From: Metro Detroit
Just ordered my MM Gen 5 today. I'll have to remember that mounting idea when I install it. I have the E-Force on my LS3 and am hoping to mount it on the passenger side but will do this if needed. I'd prefer to keep it away from the headers if possible since I'll be running the remote drain extension.
Race Director
Joined: Mar 2011
Posts: 13,262
Likes: 3,150
From: SW Florida
2021 C6 of the Year Finalist - Modified
Even the ZR1 don't have a catch can, and I don't hear of that engine popping seals ... If there would be enough pressure from blow-by to pop out seals (ie: rear main seal), it would be blowing the dipstick straight out of the tube !
I believe my engine has good enough rings on the pistons so as to prevent lots of combustion gasses from pressurizing the crankcase.
Le Mans Master
Joined: Apr 2011
Posts: 7,820
Likes: 411
From: Montreal
St. Jude Donor '13
I've seen freshly built engines blowing out seals under boost plenty of times.
If you want to be sure, then measure the crankcase pressure on a full throttle pull. Did that and at 20psi with a properly set up MM setup, there was no increase.
If you want to be sure, then measure the crankcase pressure on a full throttle pull. Did that and at 20psi with a properly set up MM setup, there was no increase.
