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I have an issue with blow-by on my vr4. Thing is I don't know where it's coming from. I've secured the dipstick down with a spring. The only other place I can suspect is the oil cap. How likely is that to be the culprit?
What's making you think there is so much blowby? The dipstick "seal" hardens up and can blow out on a normal healthy motor. Feel the rubber part at the top, it likely is dry and doesn't feel like rubber. That is what makes them pop out. I personally prefer 2g dipsticks anyways (different style)
Also, the oil cap gasket also has the same issue, and dries out and leaks, even on a healthy motor. A new gasket is like $2.
Guess I need to check all 3.
But the reason I say I have blow-by is because anything over 15lbs and the spark plug valley has a good bit of oil in it. And based by the splatter on the underside of the hood, it's coming from the driver side. Hard to distinguish between the dipstick and the cap though. Might still be the dipstick.
I've never had any luck with the stock size PVC system. Everyone upgrades the line size for a reason.
In my case I drill and tap the valve covers with 1/4" npt fittings, drill out the inside of 14mm barb to 1/4"brass fittings and sweat in a piece of copper tube with some holes drills in it. I polish the area under the VC baffle. I then drill and tap the intake manifold for a 1/4nptx14mm fitting. Intake tube gets the same fitting. Its a bit of effort but keeps everything working better, doesn't require welding and I'm not a huge fan of the an fitting look.
The only leak I had to deal with was the cas o ring, but they just fail after a while. Took care of that recently.
This has worked well to improve the overall efficiency of the system.