Oil Leak HELP

[lowball]

Ok so I just about got this project running, 84 svo motor into 76 pinto coupe. Installed Microsquirt, Stinger FMI, 3” exhaust, and more spent thousands $ and endless hours of time. Got it started with much help from Stinger Tech. As I am a computer dunce ! Actually started right up after Tech. Got me lined out on programing! Had a few glitches, slight miss but running good. Finally got to first drive. Really ran good. Till I got back to garages and notice a huge oil leak on left side of motor back of oil filter and below head ! Checked oil filter, checked oil pressure sensor and turbo oil pressure line, all good. Will idle in driveway and no oil leak whatsoever, completely dry, drive it 1/2 a mile and area completely soaked with oil as well as windshield splattered enough to make it hard to see. No idea where it is coming from. Runs 50lbs pressure sitting still but as soon as I drive it, it gushes oil out. Compression is good no water leaks. No water in oil or oil in water and nothing out exhaust. My only idea is a cracked block that when driving opens up and gushes out oil. Any ideas or ideas how I can find this leak. It’s not like it’s seeping out oil it’s dry when sitting still but gushing oil while driving, like a quart in a few miles.

[xr2300]

Do you have the PCV installed between the underside of the intake and the block?

[lowball]

yes there is a canister under IM with a hose with a pcv going back to the IM

[Stinger]

Is the oil cooler leaking (there is a rubber seal similar to what the oil filter uses between the cooler and the block)?

Is the dipstick tube seated firmly in the block?

[lowball]

I went as far as removing oil cooler and bypassed water lines and installed just oil filter only. plan to reinstall oil cooler, but that made no differance. dip stick i replaced 0 ring sealed and let dry overnight and no differance, I am at a total loss and no idea, started it this morning after complete cleaning last night and ran at idle and 3000 rpm, no leak not a drop, drive it 1/4 mile and its soaked ?

[Stinger]

I'd be tempted to zip tie a phone with the light on and record video pointing to that area for a short drive.

[lowball]

that is exacly what I just did, problem solved, so original valve cover cap was chipped on vent tube attachment so I ordered a new cap, No vent so what was happening was oil was blowing up the dip stick tube than spraying back down on the back corner of motor, looks like a sprinkler going on I will try to post video. I put old cap back on and so far looks like problem is solved. will clean motor again and see what happens. without that vent on valve cover does that seem like it could be the results of that or could there be somthing ele causing exsesive crank case presure

[lowball]

Guess I can’t post video, any way all I can say is what an idiot I am ! Thanks

[Stinger]

Upload to Youtube and post link here.

You need a valve cover vent and a crank case vent (stock PCV system). You can't plug either one. The stock system is the crankcase vent "box" on the block below the intake, to a hose with a PCV valve that then goes to the intake manifold, then valve cover vents from the rear canister and goes to the turbo inlet. There is no vent on the stock turbo oil cap. If I were to guess, I'd say you don't have a PCV valve and any sort of positive (boost) pressure is filling the crankcase through that intake connected PCV line.

[lowball]

I do have the pcv valve from the canister under IM going to IM with PCV, maybe I shpould replace PVC just because although I blew through it and seemed to work. i did not no about the valve cover vent to turbo inake,I just looked at what I have its like a .25 hose to back of VC going to small canister I locacted low in engine compartment in left front corner than I had a line that ran from canister back to IM above PVC ?, so this line I need to run to intake on turbo. I have cone air filter clamped right to Tubo so should I just add a coupler with a hose bib conection to attach this line to ? Is this .25 valve cover vent hose sufficient in size.

[lowball]

To keep it really simple can I just modify the cone air filter by adding hose bib nipple right to the filter itself. Would that work fine  

[Stinger]

You just need to understand how the system works and then you can understand what you can/can't do when deviating from stock.

Also understand that the stock vent system is marginal at best which is why we always convert to a catch can system (see our "how to not blow oil" FAQ thread).

The valve cover to turbo inlet line is drawing vacuum from the turbo inlet so it "sucks" on the line when the turbo is making boost (when it will have maximum crankcase pressure). The crankcase/pcv side is the main vent (hence the 5/8" hose) but the PCV valve is a one-way check valve which is forced closed when boost enters the line (from the intake manifold). So the main vent stops functioning when it's needed most, and then the 1/4" valve cover line is tasked with venting the engine crankcase and valve cover (hence why it's marginal at best). This closed system also "recycles" all oil vapor back into the engine which can make a mess inside the turbo inlet, intake manifold, etc.

So now that you know that the stock system requires the PCV to seal entirely when you blow through it towards the block (or else boost pressurizes the crankcase), and that the valve cover line needs to go "somewhere" that ideally draws a vacuum in boost (and never ever sees boost pressure so it can't connect to the intake manifold), then you can connect things accordingly (or ditch it all for a proper catch can setup like we outline in the FAQ).