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Sump Dinted, Risk Of No Oil Flow?

51NNA

By 51NNA,
in Engines & Forced Induction

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51NNA Community Regular

51NNA

Posted
Posted

Hi all , i recently put an rb25 in my 32 and after putting it in i realised the sump has a fair sized dint where the oil pickup is, im getting plenty on oil preasure acording to my dash but is it posible to have preasure and no flow? i will end up taking it off and fixing it but in the mean time i dont wont it to root my engine.

cheers.

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Hanaldo Grand Master

Hanaldo

Posted
Posted

Well pressure is a measure of restriction to flow... So I don't think you are asking the right question :P

In all seriousness though, they can take a fair whack before it causes problems. How big is the dent?

Rolls Grand Master

Rolls

Posted
Posted

Get a straw and blow through it until you get 10psi, get a huge 20mm wide straw and blow through it until you get 10psi. Are they both supplying the same amount of air?

So checking oil pressure is not a sufficient test to see if the pickup is working as expected, you really need to take the sump off and check, and if you do that you might as well replace it.

Zane Enthusiast

Zane

Posted
Posted

I have had a dented sump for about 6 years and never had any issues. Car was jacked up by a friend at a track day while I was cracking the wheel nuts to check the brakes. Obviously the sump looked like the cross member to him and the weight of the front end on the jack resulted in the sump being pushed up at least 25-30mm. Never realised it for weeks but the car has never had any oil issues so the damage internally must be minimal. I figured I just got lucky but monitor the pressure gauge religiously when giving it the boot.

Something I've always wondered was where the oil pickup is located in relation to, say, the sump plug? Does anyone have a pic of an RB25 with the sump off?

Z

JonnoHR31 Grand Master

JonnoHR31

Posted
Posted

got myne off atm, if i remember i'll take a pic while im putting it back together.

also, you'll actually bend the pickup tube before blocking it as it has a fairly solid gauze filter on the bottom. the rb30 that i just pulled apart was dented ~40mm and the sump was just touching the bottom of the filter.

Beer Baron Grand Master

Beer Baron

Posted
Posted

mate get it off and fix it. all the people saying it's no problem are living in a fantasy. the pickup is very close to the bottom of the sump if it's not that's another problem. a dent in the sump also changes the shape so oil is more easily run AWAy from the pick-up. on top of that it can damage the pick-up itself, kinded pick-up tube, broken pick-up tube, squashed pick-up mouth. it's not a big deal to remove the sump and beat it flat. it's a hell of a lot easier than doing a set of big end bearings that's for sure.

blk94r33 Mentor

blk94r33

Posted
Posted

Get a straw and blow through it until you get 10psi, get a huge 20mm wide straw and blow through it until you get 10psi. Are they both supplying the same amount of air?

So checking oil pressure is not a sufficient test to see if the pickup is working as expected, you really need to take the sump off and check, and if you do that you might as well replace it.

My point exactly, but with vacuum not pressure. smile.gif

mate get it off and fix it. all the people saying it's no problem are living in a fantasy. the pickup is very close to the bottom of the sump if it's not that's another problem. a dent in the sump also changes the shape so oil is more easily run AWAy from the pick-up. on top of that it can damage the pick-up itself, kinded pick-up tube, broken pick-up tube, squashed pick-up mouth. it's not a big deal to remove the sump and beat it flat. it's a hell of a lot easier than doing a set of big end bearings that's for sure.

Precisely. I'd rather remove the sump to check the oil pick up than the engine to rebuild it...

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