Sr20det redtop blow by? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

bova17 · 07-31-2014, 01:47 PM

Figured out.

Dillinja666 · 07-31-2014, 02:10 PM

Did you just start the motor for the first time? If so the rings need to seat so there will be lots of blow by at first. Should get a lot better after break in.

bova17 · 07-31-2014, 02:12 PM

I'm at about 30miles, my main question is would piston ring blow by come threw the crankcase breather hose at the same pressure as the oil cap?

Dillinja666 · 07-31-2014, 02:14 PM

Yes, they are both coming from same source.

bova17 · 07-31-2014, 02:15 PM

Ok I hope that my valves aren't seating since that's way easier, I tried asking my friends dad, but I don't think he knew what I meant

Dillinja666 · 07-31-2014, 02:16 PM

How much blow by are you getting?

bova17 · 07-31-2014, 02:32 PM

Threw the oil cap is a lot, and the crankcase breather is very little

Dillinja666 · 07-31-2014, 02:41 PM

Well continue proper break in and check it when you're done. If after you are done breaking it in and you're still concerned do a leak down test.

bova17 · 07-31-2014, 02:43 PM

Ok thank you

Yellow4g63 · 07-31-2014, 02:56 PM

Did you buy this motor from a importer or craigslist? sounds like the rings are done.

bova17 · 07-31-2014, 02:58 PM

My cousin I just rebuilt the engine, it has 30miles on it so far

Yellow4g63 · 07-31-2014, 03:37 PM

How long before the sound the of the motor changed after you started it up the 1st time? Did it start to sound better after a few min of running?

bova17 · 07-31-2014, 04:21 PM

No weird noises I hear other than lifter tick, which is going to be bleed tomorrow

jamg · 07-31-2014, 04:46 PM

did you route your lines correctly?

you could be pressurizing your crankcase, causing a lot of blow by.

bova17 · 07-31-2014, 08:26 PM

Runs pretty decent idle is a little bouncy but that's most likely the cam.

Dillinja666 · 07-31-2014, 08:29 PM

Where is the vacuum line to your PCV valve?

bova17 · 07-31-2014, 08:38 PM

Quote:

Originally Posted by Dillinja666

Where is the vacuum line to your PCV valve?

Is that the fitting on the back left of the valve cover? If so nothing is, I was going to put an air filter on it, is that supposed to go to the intake also? I just saw that people have run that to an oil catch can with a filter and thought a filter would be fine.

blksylv · 07-31-2014, 10:18 PM

Yea, that's supposed to run to a fitting on the back of your intake manifold. There should've been a swivel fitting included with the manifold or you can just get a 90 degree elbow that threads into the back on the manifold to run a hose from your pcv valve off of your valve cover to. It's not supposed to be left open. There should be suction on your catch can as well. I can tell from the picture but I'm guessing there's a filter on the other port of the catch can? Here's a good thread on catch can set ups. http://zilvia.net/f/showthread.php?t...ighlight=catch

jamg · 07-31-2014, 10:39 PM

Quote:

Originally Posted by bova17

Is that the fitting on the back left of the valve cover? If so nothing is, I was going to put an air filter on it, is that supposed to go to the intake also? I just saw that people have run that to an oil catch can with a filter and thought a filter would be fine.

that's the cause of your smoking and burning oil.

mine was the same.

itsjustdaphne · 08-01-2014, 01:36 AM

You're going to have less blowny gases through the PVC hose because the vc is baffled.. Unlike when you remove the oil cap. Do a leak down test. Boom done

07-31-2014, 01:47 PM	#1
bova17 Zilvia Member Join Date: Jul 2011 Location: cincinnati Age: 29 Posts: 279 Trader Rating: (2) Feedback Score: 2 reviews	Sr20det redtop blow by? Figured out. Last edited by bova17; 08-06-2015 at 10:26 PM..

07-31-2014, 02:56 PM	#10
Yellow4g63 Zilvia FREAK! Join Date: Jan 2003 Location: Socal Posts: 1,454 Trader Rating: (5) Feedback Score: 5 reviews	Did you buy this motor from a importer or craigslist? sounds like the rings are done. __________________ 95 240sx RB20 415whp 91 Nx2000 VVL yo

07-31-2014, 03:37 PM	#12
Yellow4g63 Zilvia FREAK! Join Date: Jan 2003 Location: Socal Posts: 1,454 Trader Rating: (5) Feedback Score: 5 reviews	How long before the sound the of the motor changed after you started it up the 1st time? Did it start to sound better after a few min of running? __________________ 95 240sx RB20 415whp 91 Nx2000 VVL yo

07-31-2014, 02:10 PM	#2
Dillinja666 Leaky Injector Join Date: Jun 2014 Location: San Diego Age: 42 Posts: 56 Trader Rating: (0) Feedback Score: 0 reviews	Did you just start the motor for the first time? If so the rings need to seat so there will be lots of blow by at first. Should get a lot better after break in.

07-31-2014, 02:12 PM	#3
bova17 Zilvia Member Join Date: Jul 2011 Location: cincinnati Age: 29 Posts: 279 Trader Rating: (2) Feedback Score: 2 reviews	I'm at about 30miles, my main question is would piston ring blow by come threw the crankcase breather hose at the same pressure as the oil cap?

07-31-2014, 02:14 PM	#4
Dillinja666 Leaky Injector Join Date: Jun 2014 Location: San Diego Age: 42 Posts: 56 Trader Rating: (0) Feedback Score: 0 reviews	Yes, they are both coming from same source.

07-31-2014, 02:15 PM	#5
bova17 Zilvia Member Join Date: Jul 2011 Location: cincinnati Age: 29 Posts: 279 Trader Rating: (2) Feedback Score: 2 reviews	Ok I hope that my valves aren't seating since that's way easier, I tried asking my friends dad, but I don't think he knew what I meant

07-31-2014, 02:16 PM	#6
Dillinja666 Leaky Injector Join Date: Jun 2014 Location: San Diego Age: 42 Posts: 56 Trader Rating: (0) Feedback Score: 0 reviews	How much blow by are you getting?

07-31-2014, 02:32 PM	#7
bova17 Zilvia Member Join Date: Jul 2011 Location: cincinnati Age: 29 Posts: 279 Trader Rating: (2) Feedback Score: 2 reviews	Threw the oil cap is a lot, and the crankcase breather is very little

07-31-2014, 02:41 PM	#8
Dillinja666 Leaky Injector Join Date: Jun 2014 Location: San Diego Age: 42 Posts: 56 Trader Rating: (0) Feedback Score: 0 reviews	Well continue proper break in and check it when you're done. If after you are done breaking it in and you're still concerned do a leak down test.

07-31-2014, 02:43 PM	#9
bova17 Zilvia Member Join Date: Jul 2011 Location: cincinnati Age: 29 Posts: 279 Trader Rating: (2) Feedback Score: 2 reviews	Ok thank you

07-31-2014, 02:58 PM	#11
bova17 Zilvia Member Join Date: Jul 2011 Location: cincinnati Age: 29 Posts: 279 Trader Rating: (2) Feedback Score: 2 reviews	My cousin I just rebuilt the engine, it has 30miles on it so far

07-31-2014, 04:21 PM	#13
bova17 Zilvia Member Join Date: Jul 2011 Location: cincinnati Age: 29 Posts: 279 Trader Rating: (2) Feedback Score: 2 reviews	No weird noises I hear other than lifter tick, which is going to be bleed tomorrow

07-31-2014, 04:46 PM	#14
jamg Nissanaholic! Join Date: May 2009 Location: GA Posts: 2,106 Trader Rating: (7) Feedback Score: 7 reviews	did you route your lines correctly? you could be pressurizing your crankcase, causing a lot of blow by.

07-31-2014, 08:26 PM	#15
bova17 Zilvia Member Join Date: Jul 2011 Location: cincinnati Age: 29 Posts: 279 Trader Rating: (2) Feedback Score: 2 reviews	Runs pretty decent idle is a little bouncy but that's most likely the cam.

07-31-2014, 08:29 PM	#16
Dillinja666 Leaky Injector Join Date: Jun 2014 Location: San Diego Age: 42 Posts: 56 Trader Rating: (0) Feedback Score: 0 reviews	Where is the vacuum line to your PCV valve?

07-31-2014, 10:18 PM	#18
blksylv Nissanaholic! Join Date: Nov 2007 Location: bumfuck VA Posts: 1,823 Trader Rating: (33) Feedback Score: 33 reviews	Yea, that's supposed to run to a fitting on the back of your intake manifold. There should've been a swivel fitting included with the manifold or you can just get a 90 degree elbow that threads into the back on the manifold to run a hose from your pcv valve off of your valve cover to. It's not supposed to be left open. There should be suction on your catch can as well. I can tell from the picture but I'm guessing there's a filter on the other port of the catch can? Here's a good thread on catch can set ups. http://zilvia.net/f/showthread.php?t...ighlight=catch

08-01-2014, 01:36 AM	#20
itsjustdaphne Zilvia Addict Join Date: Sep 2011 Location: South FL Posts: 785 Trader Rating: (12) Feedback Score: 12 reviews	You're going to have less blowny gases through the PVC hose because the vc is baffled.. Unlike when you remove the oil cap. Do a leak down test. Boom done