my buddy has a built up car. it doesnt matter what it is really but it has a straight six with twin turbos. he is running 2 xtra quarts of oil on a stock pan. he thinks its better for it cause he has a oil cooler and the turbos. im sure he only needs an xtra 1/2 quart if any for the cooler. but i say he is ruining his ****. like the other day he pulled up and blew off a oil cooler line. lost about quart. the car has a rodknock again. had a slight one last week now its bad. this is the 4th engine he has built so he is doing something wrong. i just want to make sure this over filling of oil has nothing to do with it. i cant tell him otherwise but im preety sure you dont want 2 xtra quarts on a stock pan. he needs to stop reading wikipedia
It depends on a number of things.... If the oil is hitting the reciprocating ***embly, or is close enough to be pulled in, during ordinary driving.....all he is doing is turning a lot of the oil into a frothy air/oil mess....and possibly starving the engine. In spite of having "2 extra quarts". Most wet-sump pumps will not pump oil froth at all. On the other hand, if he is emptying the pan during high rpm blasts, the two quarts MAY (& it's a big, fat MAY) be helping him out. In this case he needs to make improvements to the oil pan with baffles, windage screens, & more capacity (or a dry sump if he's really out there). In this case the two quarts would be merely a crutch. Hard to say more without knowing something about the car, engine, & his use of it.
cause it will froth it all up right? or am i way off base here. i run the correct amount of oil in all my cars and have never blown up a motor. (other then my old hondas but those dont count) yes its a poopra but shhhh, all that matters is it has a engine and has too much oil
When you overfill the crankcase by a quart or more, then you risk "foaming" the oil. If the oil level gets high enough, the spinning crankshaft can whip the oil up into a froth, and the oil pump can't pump froth. That's not me talking, it's Tom & Ray from Car Talk. Google "overfilled crankcase" and you'll get their response to a question about overfilled crankcases. In other words, you are 100% correct, and your buddy is going to continue damaging his ride until he grows a brain.
If the oil is getting churned up by the crank then its gonna get airated .That means it will get tiny bubbles of air mixed in with it. This will decrease the lubricating effect of the oil. If the oil cooler holds an extra 1/2 quart then its not necessary to put an extra 1/2 quart of oil in it unless the cooler is drained along with the crankcase oil. Other wise the crankcase will be a 1/2 quart over full. If he wants extra oil capacity then I would suggest adding one or more remote oil filters. The extra volumn of oil that they hold wont raise the lever in the crankcase.
If he's got that much money, you neet to talk him into selling it and buying a REAL car! Again, O/T, a 2JZ is a hell of a tough engine. Not that easy to break. This guy sounds really talented if he's blown 3 of them so far!
its a 1jz swapped into a 88. with around 450 horse. he just bought a 2j for it last night now. im going to show him this post and hope i can set him straight. the car does have a remote filter and is street driven but set up for track racing for the most part. Thanks for the info guys
well i just called him and told him, he says your all wrong and that his crank doesnt hit with that much oil... cant tell this kid any thing. i think he liked wasting money
If it's above the full mark on the dipstick, it's too full. It'll cause problems like loss of power due to windage, leaks, and can make the oil foam, leading to lubrication issues.
Tell him the problem is with the dipstick... ... behind the steering wheel. Let him throw money away rebuilding it a few more times, maybe he'll start thinking about it.
Just tell him to remove some of the oil 'cause he's LOSING power.....if the crank is hitting the oil in the pan, even if it's just a little, it's robbing power....'cause it IS slowing down the resiprocating ***embly....
Yeah, sure it's not hitting while sitting dead still on level ground, but as soon as he accellerates or brakes, the oil sloshes back or forward letting it hit the crank, therefore frothing it up.
Exactly! It's all the extra energy the ***embly has to use up to get through the oil. Prove it to him by trying to chop your hand through water as fast as possible. Look at what the water does, especially if you continously chop as fast as you can.
The crank is whipping the oil into a foam made up of air and oil. The oil pump can't pick up foam, can't pump foam, foam, (99% air) can't lubricate the engine. Your friend has FOAM for brains.
That dipstick, the one in the engine, not the owner, doesn't need a brain. The full mark on the stick is always right. The added volume in the cooler and plumbing for the hair driers will be automatically accounted for. The engine knows best. Trust the stick that sticks in the side of the block!!!!!
One definition of stupidity is doing the same stupid thing over and over but expecting different results. Hell, if a couple of extra are good, a couple more ought to be even better. That's my advice to him, more oil! This post may be the only one in this thread that he'll believe. (Psssst, your friend is an imbecile!)
Tell him you only add extra oil the first time, cause those lines and coolers don't drain out when the oil is changed. Full on the dipstick is full.
so far, every one here is dead on, except for the part about when the rods contact the oil...with that tight of a clearance. contact with ANYTHING, be it oil, another mechanical part, anyhting will kick the **** out of a rod bearing. I had a windage tray get loose once, and it touched a rod as it went past...it clobbered that one rod bearing.- and it's not like it was even a noticable contact. about the rough equivilant of having a finger ride on the rod as it went past...and it just knocked the hell out of it. point being, if a rod (or rods) hit oil as they move past, sooner or later, no more bearings for you!
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