Thread: Number 6 oiling issues

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I have seen several BBC with oil issues on #6.
rods breaking and bearing failures while other rod bearings were still in good condition.
Who can answer why? And what is going on with it?
BTW, this is all with different builds and different engines, all for drag racing and running up to 7500 rpm.

have built or help build many big block s that ran to 8000 + on NOs .. rods all stay in the engine . i seen 7 go old guy told me this was from the fire order mis fire many moons ago. one thing is you should stay away from cross drilled cranks .stock oiling with a 3/4 grove oiling mains or strait shot oiling crank. i will not post were i set my rods and mains on my builds i have made stuff stay together with stock blocks .darts . worlds. donovans not all have the same oiling all been to 8000. not all with the same cranks or oiling sounds like there is more to this .time to look at a better oil pan for oil control there something your doing wrong and its been carried thru out all of yor builds .what is the variable that stay s the same other then a big block thats not it rods have never been a issue. housing bores are a big deal with i spend alot of time on rods and mains and re working some oiling holes in the block i seen bearings get beat out and cranks get bent from to much timing and to much NOs but that was not the engine but the tune was way off you can tell there will be marks in the bearings when they start to get beat to death caps will start to move you will see fretting housing bore on rods will do this a well if you have not the rigth crush on the bearing s . my esteemed colleague MR J Clayton may have some to add to this

Chatham, Il---they still have that speed trap ????

I haven't been on top of his builds until this last one.

He did mention that his oil pressure would fall to zero at the finish line---ALL SEASON!!!!
He had an 8 quart pan on it and ran it with 6!!!! So, one quart of BP cost the engine.
He seems to alway loose no 5+6 rods.
Just trying to figure out why, if oil starvation would it get those two first?
This engine He just bought and we did a TD inspection, found #6 looked the worse again, so it isn't his build and has an aluminum pan that he was told is a 7 quart??? There is no sump and I want to be sure he doesn't loose it the same way.


No speed traps around now they are good if you are only 5 over and sensible.

well its sucking air pan i would say is a good place to start no doors in the pan?

There is a trap in the back but I think the pan is more like a 8 quart. What happens when he hits the brakes? Will there be enough oil available?
i will call him and ask what model it is. i should of done that already before I asked!
I want him to get a pan for his application. That engine came from a sand truck or sand dragster.

if the oil psi drops to O then then oil is moving away from the oil pump pick up letting it to suck air . so thats a very bad thing if this is a fully trap door pan with the rigth oil pick up set up were it needs to sit in the pan and as a windage tray your oil psi should not drop how the oil ropes the crank at shut down comes in to play as well but all oil is in front of the pan if oil PSI is O then them rods can be working on just oil splash shure that oil has the trap doors shutting off the right way ? a oil pan off a boat can have the trap doors open up when you want them shut in a car as some boats have the engine back to front and drive of the front of the crank not the fly wheel a Moroso oil accmulator is cheaper then a engine if oil is O then there your deal

The trap door does keep oil in the rear of the pan.
But, if he is running it with 6-7 quarts I feel it is borderline to keep the pick up covered.
i'll post after I find out the pan info later.
Thanks.

If he is running it low on oil to begin with---what about the filter-is he prefilling the filter??? A high output pump will also pump more oil out of the pan quicker and if its not restricted will fill up the top and not get back to the pan in time--some heads don't drain back very well and some blocks don't have the drain back holes at front and rear of the valley clean( Casting flash)