Dry sump...

[Dan@SJM]

Not really understood this ever...

As i understand it, its to stop oil surge on hard cornering etc etc, but where would the catch/feed tanks go? a friend is having her astra gsi done(pointless as she never drives that hard!) and shes having the tank put in the boot, now i see this as a way of killing the engine quicker, as the oil has to get from the tank through the car and then to the engine. also, does it need more oil than usual, as shes getting a huge tank(ive worked it out to be about 25l!!) put in(im thinking about the increase in weight there!).

Can anyone explain this for me?

 

[SpaceMonkey]

Dry sump is designed to save engines, not kill them mate.

25l tank?!?!? Surely thats massive over kill?
You sure it's not a water injection or intercooler spray jet tank?

 

[Dan@SJM]

yea shes having dcoe's put on...

when i say killing it im talking about the amount of time it'll take to get from the tank in the boot to the pump!

 

[steviet]

Id have thought itd be a pressurized system, kinda like a hydraulic system, with its own pump, id have thought the pump would start running on the first click of the ignition, thus getting oil to the engine before it cranks. i think.....

 

[SpaceMonkey]

You can run an "Accusump" that can pressurise the system before you even turn the ignition key. With a pressurised system I wouldn't of thought it will matter how long the hoses are tbh.

 

[steviet]

A gas charged accumulator in the pressure (feed) line to the engine????

 

[SpaceMonkey]

A gas charged accumulator in the pressure (feed) line to the engine????

www.accusump.com

 

[steviet]

Yep, that'd be the fella. cant think why someone would want one unless they were racing, or they were doing a lot of track days and getting oil starvation in long corners, even then, youd try a baffled sump first. Or i would ......

 

[BenR]

dry sump for a road car.....waste of time.

Its only really there to ensure constant oil supply rather than any hard cornering or G changes which will expose the oil pump pickup.
So you dump the OE oil pump, sump, pickup and replace it with a pan which just collects oil. You have a twin stage pump which sucks from the sump and sends it to the tank, then you have the other half of the pump sucking from the tank and sending it to the engines normal oiling system.

easy

 

[SpaceMonkey]

Yep, that'd be the fella. cant think why someone would want one unless they were racing, or they were doing a lot of track days and getting oil starvation in long corners, even then, youd try a baffled sump first. Or i would ......

I baffled the sump on my DC5 purely because there have been cased of the K20 suffering oil starvation on left handers. It was a precaution for me & was more than enough.

Ben - Well done on the explanation bit mate

 

[BenR]

K20A also has oil cavetation problems at peak rpm.

 

[SpaceMonkey]

K20A also has oil cavetation problems at peak rpm.

That too......I had TGM Motorsport do the sump.
Tom uses his own for his race cars so was more than enough for my road car.

 

[Ollie82.]

The Exige comes with the option of having an Accusump fitted. Its comes as part of one of the Sports packs.
Its OE on the 240R though as that really does generate enough cornering G to warrant having it, as they are very track biased cars.

 

[Dan@SJM]

dry sump for a road car.....waste of time.

Its only really there to ensure constant oil supply rather than any hard cornering or G changes which will expose the oil pump pickup.
So you dump the OE oil pump, sump, pickup and replace it with a pan which just collects oil. You have a twin stage pump which sucks from the sump and sends it to the tank, then you have the other half of the pump sucking from the tank and sending it to the engines normal oiling system.

easy

I see, i told her that the guy installing it was conning her(charged her 2.5k just for the engine and its 2nd hand!) and its only running dcoe's not ITB's like i suggested.

Where would you have put the tank out of intrest? also how much oil is needed? like i say ive worked out the tank size she is getting to be around 25l capacity, and it'll be alot to fill it right up, but not only that, if she is doing hard cornering, if there isnt sufficient oil in the tank its going to surge anyway defeating the whole object?

 

[BenR]

You wont ever out pace a good sized oil tank with lines, the engine doesnt quite pump that much and the corner would have to be massively long and of sufficient G to hold oil away from the oilpan all together.

Oil capacity isnt really important, enough to fill the tank and lines is what you care about.

Race cars will have the tank in the passenger footwell, or enigne bay if there is space.

Boot is a long long way away simply because its a road car.

Sounds like she's been done over good and proper.

 

[GordonD]

Real race cars need dry sumps.

Some cars need something if you're going out on the track in them. A lot of the V8s need them because at 1G side loading, which you can get on a good tyre, the oil ends up in the left or right bank cylinder head instead of the sump. But the solution is usually just a deeper sump or baffling to prevent the oil from sloshing around.

25L oil capacity including the lines back to the boot and the holding tank will mean it takes forever for the engine to get up to proper operating temperature in normal road use.

As BenR says, between that and putting DCOE's on a car these days, it sounds like she's been done over good and proper. Women usually have more sense about cars than to waste money on them doing things like that.

 

[Dan@SJM]

yea i've said from the start she was being done over, but this guy has always done the work on her car and she trusts everything he says/does etc... He has been putting it off for weeks, and its now been at his garage for over a month now, so i rekon he has jumped in too deep and has either got stuck or fucked it up!

 

[Neil G]

What a waste of time & money!

 

[Englebert]

She sounds cool... hang your winky in front of her face and say the magic wand will give her three wishes once she's put it in her mouth.