crank case ventilation questions...

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AustinSilvia
Posts: 577
Joined: Fri Feb 06, 2004 10:06 am
Car: CARS, nissans sr20det ftw!

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so i have my intake and exhaust manifolds off, installing fresh lines in many places and setting everything up for the turbo with oil feed and return and what not. when i took off the upper intake manifold i noticed a very small amount of oil sitting around where the crank case ventilation comes into the runners just before the head. the odd thing is that the ka has crank case ventilation coming to all 4 cylinders instead of just one. this makes me think that they want a little oil to get through and lube the intake area (valves and what not), but i have no idea. is that oil supposed to be there? i'm going to do a compression test again once it's all back together, but right now i'm kind of worried i have bad compresion and oil and sludge is getting blown up into the manifold as a result. someone tell me what's going on.

if i do have bad compression, well then i guess i'm just that much closer to getting an sr, but i really dont think that is the case. my ka pulls as strong or stronger than any one i've seen in stock configuration. i have a '92 with a supposedly rebuilt (not 100% sure but it runs like new) '95 engine, and i beat my friends '98 in a straight line race (and he has exhaust and other things done to add a little more power while i have everything stock).


AustinSilvia
Posts: 577
Joined: Fri Feb 06, 2004 10:06 am
Car: CARS, nissans sr20det ftw!

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anyone have a reply?bump

IvanAtSPRacing
Posts: 479
Joined: Tue Apr 20, 2004 3:56 pm
Car: I make cars fast
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There is nothing really "odd" about the KA breather system. Its actually designed pretty slick. Crank case vapors start in the pan area and are drawn up thru the front cover area thru baffels on the drives side and then work their way across the front cover into a slick external baffel that the PCV valve is mounted to. The S13s have a stamped steel baffle that is spot welded together and S14s have a cast aluminum one that is bolted together. So thru the PCV valve and into the distribution manifold so that each cylinder gets an equal amount of crank case vapors.

Oil isnt supposed to get all the way to the intake but may as the motor gets older and there is more crank case pressure due to blow by.

Do your compression test and find out how good your motor is.


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