9krpmrx8's Boost Build Thread
12-12-2011, 04:01 PM
#1926
-temps of oil in the event of blow by, is your reservoir capable of that heat?
-bad gasses and vapors in your reservoir
-Venting your reservoir?
-Vacuum on your reservoir. you dont want vacuum on it thats for sure, the sohn is only gravity fed it wants no vacuum to feed properly so you will have to vent it out.
... might as well just suck it up man and get a catch can jeez
12-12-2011, 04:24 PM
#1927
SARX Legend
Thread Starter
iTrader: (46)
several things I have been thinking of,
-temps of oil in the event of blow by, is your reservoir capable of that heat?
-bad gasses and vapors in your reservoir
-Venting your reservoir?
-Vacuum on your reservoir. you dont want vacuum on it thats for sure, the sohn is only gravity fed it wants no vacuum to feed properly so you will have to vent it out.
... might as well just suck it up man and get a catch can jeez
-temps of oil in the event of blow by, is your reservoir capable of that heat?
-bad gasses and vapors in your reservoir
-Venting your reservoir?
-Vacuum on your reservoir. you dont want vacuum on it thats for sure, the sohn is only gravity fed it wants no vacuum to feed properly so you will have to vent it out.
... might as well just suck it up man and get a catch can jeez
12-12-2011, 04:52 PM
#1929
SARX Legend
Thread Starter
iTrader: (46)
Because just slapping a filter on the oil filler pipe can be messy if it does puke up oil and the filter can get clogged and then you will excessive crankcase pressure.
12-13-2011, 08:25 AM
#1932
you can use the sohn I guess.
one hint though---if you know you are going to be doing some spirited driving like track days or something--lower the oil level in the oil pan by maybe 1 mm on the dipstick. We have found after tens of thousand track miles from the Ga rx8 club members, that in doing this it really helps prevent puking of oil. It doesnt matter what type catch can you have, this helps. Lowering the level by that small amount doesnt affect anything.
one hint though---if you know you are going to be doing some spirited driving like track days or something--lower the oil level in the oil pan by maybe 1 mm on the dipstick. We have found after tens of thousand track miles from the Ga rx8 club members, that in doing this it really helps prevent puking of oil. It doesnt matter what type catch can you have, this helps. Lowering the level by that small amount doesnt affect anything.
12-13-2011, 09:10 AM
#1933
SARX Legend
Thread Starter
iTrader: (46)
you can use the sohn I guess.
one hint though---if you know you are going to be doing some spirited driving like track days or something--lower the oil level in the oil pan by maybe 1 mm on the dipstick. We have found after tens of thousand track miles from the Ga rx8 club members, that in doing this it really helps prevent puking of oil. It doesnt matter what type catch can you have, this helps. Lowering the level by that small amount doesnt affect anything.
one hint though---if you know you are going to be doing some spirited driving like track days or something--lower the oil level in the oil pan by maybe 1 mm on the dipstick. We have found after tens of thousand track miles from the Ga rx8 club members, that in doing this it really helps prevent puking of oil. It doesnt matter what type catch can you have, this helps. Lowering the level by that small amount doesnt affect anything.
12-13-2011, 10:08 AM
#1936
lol--that was my first thought too!
But it seems that we have had more problems with puking ( various amounts) on tracks that require high rpm, high load, high speed, high g forces for a lenght of time. Quicker accelerations in the lower gears and stopping like on shorter tracks doesnt seem to cause this problem for us. IDK? The guys that autocross here, have never seen it either.
But it seems that we have had more problems with puking ( various amounts) on tracks that require high rpm, high load, high speed, high g forces for a lenght of time. Quicker accelerations in the lower gears and stopping like on shorter tracks doesnt seem to cause this problem for us. IDK? The guys that autocross here, have never seen it either.
12-13-2011, 10:39 AM
#1937
PIR (RIP), FIR-east, FIR-west, FIR-main, FIR-Mondo, CalMoSp, Big Willow, SO-Willow, Buttonwillow, AMP, INDE, Arroyo Seco, Laguna Seca. And that is just the West Coast.
I've run ALL of those regularly - some with high-speed, NASCAR-style banking; others with short, hard braking and turning - and I NEVER "puke" oil.
Neither do the 1/2 dozen other RX-8s I run with regularly.
If you are "puking" oil, you are pressurizing your crankcase.
If you are pressurizing your crankcase, you are doing it wrong.
I've run ALL of those regularly - some with high-speed, NASCAR-style banking; others with short, hard braking and turning - and I NEVER "puke" oil.
Neither do the 1/2 dozen other RX-8s I run with regularly.
If you are "puking" oil, you are pressurizing your crankcase.
If you are pressurizing your crankcase, you are doing it wrong.
12-13-2011, 10:44 AM
#1938
SARX Legend
Thread Starter
iTrader: (46)
PIR (RIP), FIR-east, FIR-west, FIR-main, FIR-Mondo, CalMoSp, Big Willow, SO-Willow, Buttonwillow, AMP, INDE, Arroyo Seco, Laguna Seca. And that is just the West Coast.
I've run ALL of those regularly - some with high-speed, NASCAR-style banking; others with short, hard braking and turning - and I NEVER "puke" oil.
Neither do the 1/2 dozen other RX-8s I run with regularly.
If you are "puking" oil, you are pressurizing your crankcase.
If you are pressurizing your crankcase, you are doing it wrong.
I've run ALL of those regularly - some with high-speed, NASCAR-style banking; others with short, hard braking and turning - and I NEVER "puke" oil.
Neither do the 1/2 dozen other RX-8s I run with regularly.
If you are "puking" oil, you are pressurizing your crankcase.
If you are pressurizing your crankcase, you are doing it wrong.
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12-14-2011, 09:18 AM
#1941
I havent had any puking in a long time.
I did have puking with my last engine blew but I dont count that.
Only one way oil can get to the TB etc and that is blow by from the "crankcase" upward. This is excluding having a vacuum line from the oil filler pipe to the intake--that is an obvious one.
The oem oil filler pipe IMHO is poorly designed to bleed any pressure off--it has to many turns and air doesnt like taking turns. if you REALLY want to vent the oil pan area--hook a line up to the dipstick tube and run a breather type catch can to it. It would be a pita to deal with, but it is a straight shot to relieve any pressure and I have seen it work.
I have seen two types of blowby or puking. One is a small amount over time, the other is a large volumne over a short period of time. To deal with the later you have to have a large hose leading to the catch can as the oil is just too thick and there is too large of a volumne for a small line to handle. Obviously both can because by the same thing OR the large puke can be caused by an acute event.
I did have puking with my last engine blew but I dont count that.
Only one way oil can get to the TB etc and that is blow by from the "crankcase" upward. This is excluding having a vacuum line from the oil filler pipe to the intake--that is an obvious one.
The oem oil filler pipe IMHO is poorly designed to bleed any pressure off--it has to many turns and air doesnt like taking turns. if you REALLY want to vent the oil pan area--hook a line up to the dipstick tube and run a breather type catch can to it. It would be a pita to deal with, but it is a straight shot to relieve any pressure and I have seen it work.
I have seen two types of blowby or puking. One is a small amount over time, the other is a large volumne over a short period of time. To deal with the later you have to have a large hose leading to the catch can as the oil is just too thick and there is too large of a volumne for a small line to handle. Obviously both can because by the same thing OR the large puke can be caused by an acute event.
12-14-2011, 10:48 AM
#1945
Hard driving and downshifting on 04's creates back pressure when downshifting especially when downshifting before a turn. You have vacuum created while accelerating before the turn then the tb closes creating negative pressure any oil that was coming up from the breather tube is now pushed back towards the ends of the accordion.
keep in mind we don't have a pcv valve or a check valve on that line its a straight shot to the accordion.
keep in mind we don't have a pcv valve or a check valve on that line its a straight shot to the accordion.
12-14-2011, 12:40 PM
#1949
was it connected directly to the manifold and then also experiencing intake pulses directly or was it connected before the TB like on the RX-8? It's only real purpose is to vent hydrocarbon crankcase gases back into the engine rather than venting them directly to the atmosphere. It's simply an emissions strategy.
Think about what it takes to push oil vertically from the sump up a small tube to the intake point, it would require a lot of blowby to accomplish this
Think about what it takes to push oil vertically from the sump up a small tube to the intake point, it would require a lot of blowby to accomplish this
Last edited by TeamRX8; 12-14-2011 at 12:42 PM.