The pressure is so high that a very small amount of the air escapes around the piston and piston rings into the crankcase. The intake and exhaust valves are obviously closed as well. The only things containing this high pressure are the cylinder itself, the piston and the piston rings that seat against the walls of the cylinder. This compression creates an immense build-up of pressure in the cylinder. The intake valves close and then the piston rises up towards the top of the cylinder. At the same time, fuel is injected into the cylinder. This draws in the cool dense air for combustion. The piston first goes down with the intake valves open creating a vacuum. This means that the piston has to go up and down a total of 4 times to complete a cycle. All internal combustion engines that run off gasoline are 4 stroke engines. This article is dedicated to providing a very detailed explanation showing why a catch can is highly recommended in direct injection engine applications.įirst, let's go over what is currently happening in your engine without a catch can installed. Please click here for more information on legal requirements related to use of BMS parts.There is a large debate as to whether or not oil catch cans are worth the money or not.
BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. Home of the JB4 the worlds most popular turbocharged tuning system! Also prevents boost from getting past the OEM PCV valve. I placed the tee behind the EVAP check valve to prevent the catch can from being boosted. Instead of tapping the intake manifold, I used the OEM EVAP port on the side. I only used the BMS can because I already had one on the boost-side, and it wasn't catching anything. I have a Mishimoto can on the way since it is geared more towards the vacuum side of the PCV system than the BMS can. I was going to put mesh material inside to improve filtering but didn't get around to it. The catch can is a BMS unit which I modified to accept 3/8 NPT x 3/8" hose barb fittings. Then ran 3/8" line out of the PCV valve to the catch can. Connected the PCV valve to the AD fitting with a very short piece of 1/2" tubing. Then I did the same with OEM PCV valve, machined off the threads down to 1/2" hose barb.
Also had to machine down the part of the fitting where the large green o-ring goes, it was 30-40 thousandths to big causing the o-ring to be pinched and tear. I used the AD PCV fitting which comes with a -8 AN fitting but I machined it down to about 1/2" hose barb, I didn't want to deal with AN fittings. RB makes some very nice looking fittings to make this easy, but I wanted to tackle it DIY. I bypassed the OEM PCV system in the valve cover after being inspired by this thread:
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