built rb25 neo oil control problem - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

240sxrb25 · 06-29-2013, 12:20 PM

i have a neo rb25 thats built with cp pistons, spool rods, acl bearings and such. the motor has an N1 oil pump. the rear oil feed in the head is blocked, i have a rear head drain going back into the oil pan. i have the front oil feed in the head restricted. i am not using vct so i also restricted that passage as the neo has no restrictor for vct from factory.

i am having a massive oiling problem, where in one 1/8 mile pass my catch can is filling completely. the can is one port with a breather on top. both valve covers are connected and one hose runs to the can.

i have a proper pcv valve and a true check valve inline also between valve cover and intake.

this problem was so severe that a few months back i tore the motor down and remeasured EVERYTHING. all machine work is correct, and i re-ringed the motor a little tighter this time. the engine is still doing the same thing.

im running about 30psi on E85 making a little over 600hp. with ET drags in the back, the car is under more load than it ever is for three gears and fills the can insanely fast. is there another alternative such as bigger catch can with bug breathers and a return to the oil pan?

i know that motors this small with high boost experience block pressure, but are they all this bad?

please help me if you have first hand experience with high hp rb's and oil issues, THANK YOU

240sxrb25 · 06-29-2013, 12:22 PM

also the can isnt filling with condensation/oil frothy crap that happens from blowby, its literally just pumping clear fresh oil out the valve covers...

OutToWinPAHC · 06-29-2013, 12:33 PM

The drain in the rear should be fine as its very low but why did you block the factory drain path too?

240sxrb25 · 06-29-2013, 12:55 PM

i didnt block any drains

*fliprayzin240sx* · 06-29-2013, 08:14 PM

Sounds like you have alot of blow by...might wanna read this if you havent. Doing the rear oil mod might help you.

The SkyLife - Automotive news, community and passion shared: RB26 Engine Assembly rebuild How to - RB26DETT Motor

240sxrb25 · 06-30-2013, 01:52 AM

Anyone with built motors have any advice?

240sxrb25 · 06-30-2013, 01:53 AM

Quote:

Originally Posted by fliprayzin240sx

Sounds like you have alot of blow by...might wanna read this if you havent. Doing the rear oil mod might help you.

The SkyLife - Automotive news, community and passion shared: RB26 Engine Assembly rebuild How to - RB26DETT Motor

Thanks for the input

06-29-2013, 12:20 PM	#1
240sxrb25 Zilvia Junkie Join Date: Aug 2006 Location: omaha, ne Age: 35 Posts: 451 Trader Rating: (2) Feedback Score: 2 reviews	built rb25 neo oil control problem i have a neo rb25 thats built with cp pistons, spool rods, acl bearings and such. the motor has an N1 oil pump. the rear oil feed in the head is blocked, i have a rear head drain going back into the oil pan. i have the front oil feed in the head restricted. i am not using vct so i also restricted that passage as the neo has no restrictor for vct from factory. i am having a massive oiling problem, where in one 1/8 mile pass my catch can is filling completely. the can is one port with a breather on top. both valve covers are connected and one hose runs to the can. i have a proper pcv valve and a true check valve inline also between valve cover and intake. this problem was so severe that a few months back i tore the motor down and remeasured EVERYTHING. all machine work is correct, and i re-ringed the motor a little tighter this time. the engine is still doing the same thing. im running about 30psi on E85 making a little over 600hp. with ET drags in the back, the car is under more load than it ever is for three gears and fills the can insanely fast. is there another alternative such as bigger catch can with bug breathers and a return to the oil pan? i know that motors this small with high boost experience block pressure, but are they all this bad? please help me if you have first hand experience with high hp rb's and oil issues, THANK YOU

06-29-2013, 08:14 PM	#5
fliprayzin240sx Man w/ CTSV & a Car Seat Join Date: Aug 2002 Location: Tampa Posts: 17,998 Trader Rating: (19) Rides Gallery: fliprayzin240sx Feedback Score: 19 reviews	Sounds like you have alot of blow by...might wanna read this if you havent. Doing the rear oil mod might help you. The SkyLife - Automotive news, community and passion shared: RB26 Engine Assembly rebuild How to - RB26DETT Motor __________________ If you think Zilvia has too many assholes... CLICK HERE!!!

06-29-2013, 12:22 PM	#2
240sxrb25 Zilvia Junkie Join Date: Aug 2006 Location: omaha, ne Age: 35 Posts: 451 Trader Rating: (2) Feedback Score: 2 reviews	also the can isnt filling with condensation/oil frothy crap that happens from blowby, its literally just pumping clear fresh oil out the valve covers...

06-29-2013, 12:33 PM	#3
OutToWinPAHC Zilvia Addict Join Date: May 2007 Location: Florida Posts: 746 Trader Rating: (6) Feedback Score: 6 reviews	The drain in the rear should be fine as its very low but why did you block the factory drain path too?

06-29-2013, 12:55 PM	#4
240sxrb25 Zilvia Junkie Join Date: Aug 2006 Location: omaha, ne Age: 35 Posts: 451 Trader Rating: (2) Feedback Score: 2 reviews	i didnt block any drains

06-30-2013, 01:52 AM	#6
240sxrb25 Zilvia Junkie Join Date: Aug 2006 Location: omaha, ne Age: 35 Posts: 451 Trader Rating: (2) Feedback Score: 2 reviews	Anyone with built motors have any advice?