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Showing results for tags 'blowby'.
Found 2 results
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RB26 Front Crank Seal Failure - Help Hey guys, needing some expert help with diagnosing as engine breathing/ventilation stretches my problems solving! Ill give as much related info as I can; Car Is Stagea 260Rs, making around 290awkw with reimax oil pump gears (slightly larger clearances on the crank than OEM if that helps), no catch can or different breathing set up. Had an undetected oil leak for two days before a serious leak occured suddenly. Pulled engine out as I suspected fractured oil pump gears due to larger than OEM crank clearances. Turned out to be a failed front Crank seal, seal has spilt in half, spliting into two round bits and the metal inside the seal now looks like a kitchen sink scour. The seal was replaced less than 3,000km ago. Ive done some research on SAU to try find some answers, and Im led to believe its something to Do with crankcase ventilation, moreso pressurization of the crankcase. Ive also spotted oil in the pre turbo intakes, and ic piping. Car also gives smoke off on WOT. Any input would be appreciated
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This will be a weird one: RB25 Neo head on rb25 neo block with 26 internals (CP, Eagle, ACL, ARP, Cometic HG 2.5mm), enlarged oil returns, blocked feed, 1.1mm on the other one. VTC inactive. Rear head vent to crank, big catch can vented with oil return to pan and vents to crank and valve covers, Jun oil pump. Tomei baffle box on the oil pan. This was fully done with everything i saw around. Everything was done as perfect as i could. Ever since day 1 ive had a weird white vapor coming from the valve covers (pcv valve hole open to air, i never got it into the catch can), like a light smoke, almost like something burning slowly. And a tick on the head after warm up (i meassured valve to cam clearance as best as i could and its within spec, but im guessing one was too tight maybe...) i ignored it for now. Compression was fine after initial start and break in, 175 psi. Anyways, i made over 450hp with clutch slipping, a lot of things happened, in the end it was ran hard, it worked. Last weekend i went to a drift demo we had. PCV hole was open to air still, engine squirted oil on the bay, oil temp was around 270-290, it was hot as hell. oil pressure was fine all the time, blew the turbo seals BUT i had more white smoke comming from the pcv hole now. shut down, it kept smoking for quite a while, like something was burning. i dont know what that is, maybe its the shitty mobil 1 mineral oil? i dont know. Due to the turbo smoking, i towed the car home, in my mind i broke a piston ringland. But not i didnt. still have 170 psi compression, leakdown @ 75 psi was only showing 2% - 4% according to the instructions on the leakdown tester (4-8 psi loss), compression test was done cold and hot after rolling the car to the shop. leakdown was made cold. This was quick check while hot: at home, 8pm, i shined a light on the pcv hole and i could clearly see the smoke being pushed out, giving it throttle it clearly pushed it harder. So what now, compression is fine, leakdown is fine, but engine seems to be smoking from the covers for some reason. im leaning towards BAD oil doing something weird under heat. I supposed blowby would be noticeable on the leakdown, but its fine right? (75psi in, 72psi held, it was never over 8psi difference), maybe i dont really grasp how blowby works vs these tests or something.... Any ideas?
