The wet test indicates bad piston rings at 3 and 5 If the wet test result were the same as the dry test in those cylinders that should indicate valve issue
The breather into bottle wasn't sufficient enough to diagnose blow by. Vapor coming out of the valve cover needs something to cling to so that it turns into visible condensation. Reason why most good catch cans have some sort of perforated foam or wool inside of them for the vapors to pass through. A better and quick test would be just to have the breather off the valve cover open to atmosphere and run the engine oil to operating temp. Then see how much smoke is coming out of the breather pipe. Thick and visible is excessive blow by. Light and very translucent is normal. A kinked oil drain line can also push oil past your seals; check to see if nothing has happened. Also, a better indication to see if your turbo needs a rebuild is to remove the downpipe and see if the exhaust wheel is a little wet.
3 and 5 is high enough for it to run smooth but not optimal, and is indicating rings most lightly as you are seeing oil, valves would not be causing oil gathering. guessing its around 170-180 factory as for most trubo "low" compression engeines. NA usually lies around the 200mark
concluding with that the wet test is valid is not correct (dry test is the one to go from). that oil made the rings seal. wont be like that when operating 😢 on that note it may run fine but not optimal and may not have too much blow-by even with low compression. leakdown test next to se if valves are the issue, then rebuild with rings or lap valves :/
If compression on a cylinder rises after cylinder is coated in oil that means he rings are worn, if oil is added and compression doesn’t rise much then could be a valve seal. Oil is meant to add a extra coating to the rings so you can find out which is the issue
Still put money on it being the o ring behind the compressor wheel. New journal bearings, thrust washer and rebalance will just be a bonus, but not the culprit of the leak
Rings are definitely going bad in #3/5 but you took so long to get this thing running so doesn't make any sense to rip it out and take who knows how long to rebuild. Take it from someone who's had an rb for 8 years here in the states that you don't want to go down that expensive road to build it. *JUST ENJOY IT UNTIL IT BLOWS, IT COULD LAST FOR YEARS TBH*...
You don't think this could have something to do with not running a blow off valve? You are literally spooling the turbo backwards pretty violently when air gets forced backwards due to overpressure. It should load the seals pretty badly in my mind, but I'm no expert and I don't know the history of the turbo.
its impossible for the turbo to spool backwards just from compressor surge. I'm not sure where you learned that from but do not trust that source anymore. Compressor surge is perfectly normal for stock motor, stock boost. The worst the would happen from too much boost is a coupler would blow before the turbo "spools backwards." Really anything below 1 Bar of boost with no blow off valve is not an amount that should be worried about when running no blow off valve.
@@rianonekeo I work with rather large diesel engines of well over a meter in diameter of compressor wheels on the turbocharger and of there is a problem with the waste gate on those engines, you can get compressor surge (which will literally make you shit your pants, trust me, I've tried standing next to one). The sample frequency of the turbine speed sensor on those engines is not enough to record every millisecond, but they record enough to log an almost compete stop of the turbine from 20 000 rpm when this happens. The kinetic energy and rotating mass of such a turbine is a lot larger than a tiny 80 ish mm turbo so I would not at all be surprised if it rotates backwards. Put a turbine speed sensor with a good enough sample rate and I'd be willing to bet money it spins backwards.
A turbine will never spin backwards upon compressor surge. It will not overcome the force of the exhaust wheel spinning from the engine. The noise is created from an increase pressure in the charge pipes, but with minimal flow (because the throttle is closed) and the only escape is backwards through the wheel. Think of it like talking into a fan blowing in your face. Remember the funny sounds? Same concept. Also, I disagree with Rian. Compressor surge loads the bearings inside the CHRA. Engineers, like myself, developed them for a reason before the tuner scene ran off with them for gimmick purposes.
The wet test indicates bad piston rings at 3 and 5
If the wet test result were the same as the dry test in those cylinders that should indicate valve issue
The breather into bottle wasn't sufficient enough to diagnose blow by. Vapor coming out of the valve cover needs something to cling to so that it turns into visible condensation. Reason why most good catch cans have some sort of perforated foam or wool inside of them for the vapors to pass through.
A better and quick test would be just to have the breather off the valve cover open to atmosphere and run the engine oil to operating temp. Then see how much smoke is coming out of the breather pipe. Thick and visible is excessive blow by. Light and very translucent is normal.
A kinked oil drain line can also push oil past your seals; check to see if nothing has happened.
Also, a better indication to see if your turbo needs a rebuild is to remove the downpipe and see if the exhaust wheel is a little wet.
The only TH-camr who is consistent with good content. Always good videos.
Also make sure throttle body is wide open during the compression test as well!!
3 and 5 is high enough for it to run smooth but not optimal, and is indicating rings most lightly as you are seeing oil, valves would not be causing oil gathering. guessing its around 170-180 factory as for most trubo "low" compression engeines. NA usually lies around the 200mark
and wow that's alot of oil. didn't hydrolock or blow something? XD i use some wd40 or similar and just give it a quick spray 🤷♀️
concluding with that the wet test is valid is not correct (dry test is the one to go from). that oil made the rings seal. wont be like that when operating 😢
on that note it may run fine but not optimal and may not have too much blow-by even with low compression.
leakdown test next to se if valves are the issue, then rebuild with rings or lap valves :/
How to NOT install a used stock motor
If compression on a cylinder rises after cylinder is coated in oil that means he rings are worn, if oil is added and compression doesn’t rise much then could be a valve seal. Oil is meant to add a extra coating to the rings so you can find out which is the issue
Use a catchcan
Turbo rebuild cause i think internet people would like to see the inside of s turbo and this shaft play
Aidan _sp stock rb20 turbo isn't worth rebuilding. They're garbage and die at over 20psi. He should go rb25 franken turbo
What're your thoughts? New turbski or just rebuild?
Whatever you want, i want both and mo powa babeh!!
Go build RB25
Or both?!
Or you could just single turbo its mum and make proper power
RB25
Still put money on it being the o ring behind the compressor wheel. New journal bearings, thrust washer and rebalance will just be a bonus, but not the culprit of the leak
The amount of oil thats in there might not be bad. its just an issue if its in there after just one run about 10 miles ... after you cleaned it ?
LOL! spends $1000s on drift car with no remorse.... $40 pressure gauge?......NO WAY lol
I can’t lie. Le Drift Car sounds so fucking good!! I need to start my build!
The title describes every time I’ve bought a JDM motor
Fuck JDM exports of Charlotte
Leak down test is good to do my guy
Turbo seals, and piston rings, then it would be golden!!!
Yesss new video right after getting done with my project for the day and cracking a "nice progress" beer. Perfect timing
Rings are definitely going bad in #3/5 but you took so long to get this thing running so doesn't make any sense to rip it out and take who knows how long to rebuild. Take it from someone who's had an rb for 8 years here in the states that you don't want to go down that expensive road to build it. *JUST ENJOY IT UNTIL IT BLOWS, IT COULD LAST FOR YEARS TBH*...
Go bigger turbo!
Interesting count needed!
And add engine restore
We all know that the most expensive mods can be the classic while your in there mod they stack up quick.
more s55 content pls!
I just watched the funniest 2:30 ad
rb25 steel wheel turbo is da way
Get an r33 turbo swapped on their
TLDR BLOWN TURBO
99 problems and there all RB problems
You didn’t have the bottle on long enough
What's the intro beats name?
too much crankcase pressure
So overhaul the engine and slap on a new gtx turbo 👀😝
The GTX gen 2 are very nice :D. I gained 1000 rpm in spool up with gtx 3071r gen 2 over my old gt30r.
spectrum is the turbo you need! www.spectrummotorsportssolutions.com/products/r32-r33-r34-rb20-rb25-rb26-smr400-bolt-on
Rb25 neo turbo
Rebuild
❤️
You don't think this could have something to do with not running a blow off valve?
You are literally spooling the turbo backwards pretty violently when air gets forced backwards due to overpressure.
It should load the seals pretty badly in my mind, but I'm no expert and I don't know the history of the turbo.
its impossible for the turbo to spool backwards just from compressor surge. I'm not sure where you learned that from but do not trust that source anymore. Compressor surge is perfectly normal for stock motor, stock boost. The worst the would happen from too much boost is a coupler would blow before the turbo "spools backwards." Really anything below 1 Bar of boost with no blow off valve is not an amount that should be worried about when running no blow off valve.
@@rianonekeo I work with rather large diesel engines of well over a meter in diameter of compressor wheels on the turbocharger and of there is a problem with the waste gate on those engines, you can get compressor surge (which will literally make you shit your pants, trust me, I've tried standing next to one).
The sample frequency of the turbine speed sensor on those engines is not enough to record every millisecond, but they record enough to log an almost compete stop of the turbine from 20 000 rpm when this happens. The kinetic energy and rotating mass of such a turbine is a lot larger than a tiny 80 ish mm turbo so I would not at all be surprised if it rotates backwards. Put a turbine speed sensor with a good enough sample rate and I'd be willing to bet money it spins backwards.
@@rianonekeo also props for using bar!
Should be mandatory by law.
A turbine will never spin backwards upon compressor surge. It will not overcome the force of the exhaust wheel spinning from the engine.
The noise is created from an increase pressure in the charge pipes, but with minimal flow (because the throttle is closed) and the only escape is backwards through the wheel. Think of it like talking into a fan blowing in your face. Remember the funny sounds? Same concept.
Also, I disagree with Rian. Compressor surge loads the bearings inside the CHRA. Engineers, like myself, developed them for a reason before the tuner scene ran off with them for gimmick purposes.
@@JohannesKonow listen man the turbo is not spinning backwards from compressor surge please don't spread this myth anymore...
Run some thicker oil dummy
20w50 vr1 race would help alot in that old engine!
Phew
Baaaaaa...