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    oil on intake valve's back - sbc

    I was taking off my intake manifold to do a change over to EFI. I noticed that the closed valves have oil on the back of them (this is a SBC 350). Engine only has 1000 miles and valve seals were new (viton ones), heads were new (bronze guides). Engine had been sitting for 2 weeks without...
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    preventing oil aeration

    For reasons of pump bypass cavitation. Other said that injecting the oil below the surface would cause less aeration.
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    preventing oil aeration

    I'm going to make the bypass of the oil pump in my engine dumping the oil back into the oil pan. I'm a bit worried about aeration occuring. Is there a good way to prevent it from happening ?
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    Need a oil flow graph for a small block chevy

    Yes but it doesn't seem to contain what I'm looking for unfortunatly.
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    Need a oil flow graph for a small block chevy

    Does anyone have a graph picturing the amount of oil that flows through a small block chevy at various rpm points ?
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    0W20 load bearing capability in race block

    FWIW redline begins at 7500. I'm not sure which situation your describing as the effects were more pronounced with the heavier wt oil. Hot idle oil pressure 25-30, going towards 60 before 5000 and then dropping to 45-50 towards 6000.(10W40 TOTAL) Last time (with the 5W30) hot idle 40-45...
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    0W20 load bearing capability in race block

    Adding to this, I have a feeling I'm running in circles now. I've been asking a lot of people about this but none of the answers are conclusive yet. It seems like everybody is pointing towards another cause in relation to this issue (not aiming at anybody btw). Someone said to me he had the...
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    0W20 load bearing capability in race block

    I believe that was the no 2 and 6 bearings. I believe they crossdrilled the crank or something like that. The air story seemed strange to me as well. I'm not expert on oils. What oil does have the properties you gave ? PS : the oil I used before was a 10W40 Total 7000 quartz.
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    0W20 load bearing capability in race block

    The oil says it's for both diesel and gasoline engines. As for the difference in cSt at 100°C, on average 2 cSt I think. Someone said to be carefull with the external bypass and air seggregation in the line, which could lead to the air going to the engine and the oil via the bypass. He said...
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    0W20 load bearing capability in race block

    Valvoline 5W30 api sm/cf. No oil temp gauge.
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    0W20 load bearing capability in race block

    And would that create enough hydrodynamic wedge to let the oil provide enough oil film strenght ? Anyway, the air entrainment because of injecting the oil will be as worse as in the internaly bypass since it would do it at the same speed and with the same volume. Only the external bypass would...
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    0W20 load bearing capability in race block

    That's what they said. I interpret it like this : the bypass channel in a typical sbc oil pump enters the inlet channel in a 90° fashion. Due to it being pressurized I think it will hit het opposite wall causing it to go into 2 directions, 1 part in the direction of the pump gears and the other...
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    0W20 load bearing capability in race block

    Caterham, I already run 5W30 at the moment as explained earlier. If I go this route I would set the external bypass at 70 and leave the internal at 75 psi. The oil pump would not get to 75 anymore basically rendering the internal bypass out of operation. The only negative I see is that it has...
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    0W20 load bearing capability in race block

    Another update to this. I was suggested contacting Schumann oil pumps. They make specialty pumps for these engines but based on the Original design, which my pump is by the way. Anyway, I explained the problem and they suggested a HV pump (which seems to be a requirement with my engine) but...
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    0W20 load bearing capability in race block

    Filter is before the OP sensor. The filter is the last thing before the oil goes into the block. The OP is on the inlet of the block. OP was also higher at idle as stated.
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    0W20 load bearing capability in race block

    Yes, exactly : lowering oil pressure at high speed, higher oil pressure with thinner oil.
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    0W20 load bearing capability in race block

    Another question : at idle I saw the pressure go up with the 5w30. With the 5w30 it was 40-45 psi where with the 10w40 it was around 25-30. How does this figure into the story. As for the temperatures. Yes the oil is cooler with 5w30
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    0W20 load bearing capability in race block

    I'm not sure but I remember it being all about pressure fed bearings. The other ones were mentioned as wick fed.... I'm to chick to throw in 5W20. The info on the engine states 5W30 as the thinnest, so.... I also have a lead on parts to make an external bypass because I also feel Jrestless has...
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    0W20 load bearing capability in race block

    Europe, Belgium, close to Germany. I do occassional do German autobahn at higher speeds. For the rest high performance street use. Car has a short ratio rear so need rpm. Engine is made to turn up to 7500 rpm. Seeing the recommend below .0025 and a race blend for 9500 rpm. This is probably a...
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