NeoMaggots

Okay here goes so I pulled the motor, Rebuilt the entire thing. every i dotted and t crossed. crank collar you name it. finished reassembly and started it up all was fine, noticed my AAC valve or w/e is not letting me get a high cold idle. And also noticed It still does that knock when its cold. Any ideas? I also cant seem to figure out why when I start it idles so low when cold. The aac valve opens and closes when I put power and ground to it. im guessing its not stuffed?

Bah @ Guilt -Toy You cursed me with that second post

okay got it thanks.

I'm assuming I should go ahead and port out this oil drain? if I do this and put in the restrictors should I still pop out that rear welch plug and install a drain right to the sump. (drift car) I would like to not need to install a drain.

stock. stock boost, stock injectors, ecu etc. 3" straight pipe exhaust no cat. and a rather large front mount intercooler. all swapped into a Nissan 240sx

Piston slap, #6 has bad signs of Detonation. Now to figure out why only that cyl. is bad. Must have screwed up my wiring or bad injector.

Yeah the motor was in a 240sx super easy to pull. I was in need of a new timing belt and water pump a few seals and pulleys. No signs of bearing in the oil filter, my last oil sample came back pretty regular but there's no telling until I tear it down. Any tips for When I pull the head to keep any stray coolant from getting down the cyl. Don't want a bunch of glycol getting down there if everything ends up looking healthy and it was just a bad tensioner pulley or oil pump

^ yeah I don't know what I was saying well the motor is out of the car now, should be on a stand tomorrow. It was not the oil filter drain back valve, i tested it did not leak a drop Guilt-Toy seems to be correct. I'll know in a day or two. Pictures to come. And picking up a s2 long block tomorrow. Any chances I will be able to get it to work with my NEO ECU/Harness?

^ This. I am praying this is the problem. Hp-2008 is the K&N filter for the rb25's? Nobody had one in stock still looking.

=x Full tear down is necessary you would assume from that mild knock? It only does it on full cold starts. Im going to drop the pan and check the crank for out of round, but only being able to get 2 points checked isnt proper ><

Here is a video of the knock from underneath the oil pan. https://www.facebook.com/photo.php?v=10202158035533359&l=7946916124426248770 I shut the car down once the knock was over. After those first few it stops. Going to start tearing into it tomorrow. plans are to go over the timing belt/ tensioners. cut open oil filter see how that looks, and drop the oil pan have a look in there.

going back to my beloved Rotella 15/40w the stores just opened. it gets 38 centigrade during the afternoon, No cold start knocks then =p I have one oil sample bottle, label/package left. I'll post the results of it in a week or so as soon I get my email. I'm thinking theres some wear from low oil pressure at some point. I do know last time I pulled the rockers to reseal a small leak, there was definite signs of alot of oil under there all pooled up exhaust side cyl 3 enough to be to the top of the rocker cover. I deleted my catch can when I noticed this and hooked up the crankcase ventilation to factory specs. so I may have had some head pooling and caused starvation, though since I have owned this motor I have never ever seen less than 20psi of oil pressure reading on my Stack gauge. There were also a few journeys to 107-108 degrees centigrade registering on my water temp gauge back when I ran a bumper. Now I have the temps stable @ 79 degrees moving and 82 degrees @ idle. Sound right?

Well, That brought my idle up a little bit more, The coolant valve was definitely siezed a tiny bit. But my attention was diverted. Its 4:07 am probably about as cool as it gets in Texas 27 degrees centigrade and I am getting a cold start knock. Sounds like mains, is that too chilly for 2050w? this is the second time I have heard it. It literally only knocks for 2-3 seconds about 2-3 knocks then its fine. Monday its being driven 24hrs straight on the highway, should be interesting.

a little bit of carbon build up, and the valve controlled by coolant. well i don't think thats how closed it should be =p And this is what a RB25det NEO AAC valve looks like, there are no other valves to control idle on this engine for reference.

Roger its Locked closed.