Hey guys.
Im finally trying to dial in my LS Build, even tho I have been driving it daily, I know there are things I need to finish.
Not sure if I currently have everything set up right, or if there is a better way to do things.

B18B1 Block
JDM B20 P8R Head OEM Valve Train,
Crower Stage 1 cams
B16B Pistons
B16 OR LS rods, Shot Peened and ARP'd. unfortunately I don't know for sure which ones are in the motor :-(
Balanced to the Clutch and CTR pulley.
Blox intake Mani.
3 Mil OEM Head gasket,
Type R Water pump
Gsr Timing Belt.

It has and OBD 2 LS valve cover so it has a PCV valve on it, along with a breather. The breather runs into the Intake, while the valve cover PCV is going to the vacuume port on the intake manifold.

I want to do an OEM looking oil catch can, something that is out of the way but still as functional as possible. BUUUUUUUUT my LS Block also has a PCV valve on the back of the block. And the PCV coming off the back of the block is not going to anything.

Is this how you would run things? Should I put a catch on the back of the block and the VC?

Im really new high compression so ill try and sponge up all the help I can get! Thanks

 

Just ran into the same issue with mine except I don't have a rear PCV system. In fact I'm pretty sure the b18b1 doesn't have the ports for a rear PCV system (aka the black box). U sure there's a black box on the back of ur engine? If u do have a "black box" I would use it for sure, it is a stock catch can, and just block off the valve cover PCV system. Either way u don't want to leave either PCV system open, it will cause a vacuum leak as well as not create the vacuum needed for a proper PCV setup. And with a high compression b18 u will want a proper PCV system to reduce blowby.

 

I'm gonna hook something up tomorrow first thing. I'm having so many idle issues, maybe this will help things! I'm 100% sure it has a black box. So I'll run a line from the black box pcv to the intake manifold? Then plug off the ports in the valve cover?

Should this be enough venting for a high 12-1 compression engine? Hope to get this running/idling fiiiinally!

 

I thought a1 the one that doesnt come with breather box? You can always take the freeze plugs off of back of the motor to vent the pressure to the catch can. Thats how mine is set up.

 

Nope had both, B18a1 has a black box, B18b1 does not. The plugs on the back are the way to go, the extra pressure of the high comp will want the better flow. And fixing ur vacuum leaks will absolutely help!! But there could be other issues causing the idle issue. Fix the vacuum leak first (it's free) and then work out the idle issue.

 

Thats the plan! Thanks for all of the help!

Ill post up more in the morning once i play with things!

 

The cars idle seems to be a bit more consistent... the PCV on the rear is run to the Vacuum nipple on the intake manifold. the 2 Ports on the valve cover are plugged. And i also have the IACV on the back blocked off as well. And the cars idle still bounces up and down when it gets to full operating temperature. What else will make the idle bounce?

 

iirc 94-95 b18b1 have the black box still.

 

First build, so still noobish but had my buddy delete charcoal filter,purge control solenoid and blocked off the hole on the mani with aluminum 7/16 rod, put a breather filter and re routed the coolant to skip the throttle body and engine code for pcv stuff went away.... it bounced around for me till I tweaked the idle on the mani... now chillin at 750/800 rpm dependent on load, but thats on stock set up... doubt ull be hanging at that rpm with ur set up... what I was told by my mechanic is the bouncing around is computer tryin to get to the stock 7/800 rpm but idle still set too high so keeps bouncing between what it wants to be at and what u set it at.....

 

Are you running stock ecu? Also I would plug any ports coming off the intake mani if not using it for the emissions. Putting a filter on one of those is more then likely causing the vacuum leak. Block those ports with rubber stop.

 

Look into your IACV on the back of your intake, if you unplug it and the idle gets better, try to clean it out with break cleaner the put it back on. That could also cause the idle issue. Another thing to check and make sure you do not have any bubbles in your coolant. You should have a bled valve on your thermostat housing. Just a few things to check. For a vacuum leak, just spray some soapy water from a water bottle or even window cleaner and it will make the idle change and bubble up where the leak is at.

 

yeah its just the obd2's that dont have a black box.

you want that iacv hooked up and functioning like oem.

you can use the prelude fittings on the block that has the 2 large alan head plugs, but since its kinda close to the pan it may push oil. running fittings off the valve cover is your best bet to vent gasses and not push oil.

im building an 11:1 motor and using a -10 fitting from the valve cover