Crank Scrapers

[Silver Fox 43]

Anyone on here use one, or know if they're worth using?

Rumour has it they're worth using to keep the bottom end cleaner, not have so much oil flying around? Can stop some oil starvation issues as well?

[Driftit 2079]

Have heard of slight power gains also.

There is a few different ways you can go about it. Modifying your sump or using a sandwich plate styled one.

I think to get your sump done at Race FX it was around $450+. But we spotted the sandwich plates for less than half that. Only ever seen them for the M20 though.

[QuickSilver 0]

Can someone explain to me what these do exactly? I've surmised that it cleans up down there lol?

[CamB 48]

http://www.crank-scrapers.com/bmw.html

I'd still baffle the sump too. Actually, I am just baffling the sump - sick of spending $$$ so no crank scraper.

[Mike.Gayner 0]

I would be extremely skeptical of the benefits of this.

[Driftit 2079]

I would be extremely skeptical of the benefits of this.

People have seen results in the E30 Series. But I dont think they are meant to be running them.

[Silver Fox 43]

I'd have thought they were totally illegal for the E30 series?

I'm more interested in the M30.

·Less rotating mass for the engine to accelerate because of the removed oil

·Less loss of power because of excessive drag caused by the windage cloud

· Helps reduce engine damaging oil-foaming

·Helps avoid oil starvation by keeping the oil in the pan during hard braking and turning as well as during off-road driving

·Helps to cool critical engine parts by quickly returning heated oil to the sump

·Helps to prevent the cylinder walls from being overloaded with oil

[CamB 48]

Devils advocate answers:

· Less rotating mass for the engine to accelerate because of the removed oil

· Less loss of power because of excessive drag caused by the windage cloud

· Helps reduce engine damaging oil-foaming

While possibly true, is it really going to be an issue at <6500rpm? Every bit helps on the way to 8,000rpm but I'm not going there personally...

· Helps avoid oil starvation by keeping the oil in the pan during hard braking and turning as well as during off-road driving

· Helps to cool critical engine parts by quickly returning heated oil to the sump

· Helps to prevent the cylinder walls from being overloaded with oil

A baffled sump does these jobs.

[Silver Fox 43]

Cost less than $200 landed here, cheaper than baffling the sump, and any oil it removes has got to be an improvement?

[CamB 48]

I agree on the potential improvement (was only being devil's advocate), and $200 isn't much in the scheme of these things, BUT I would baffle the sump anyway. Not worth not doing it.

Edited April 9, 2009 by CamB

[Silver Fox 43]

You're probably right.

[DRTDVL 0]

how would these differ from a windage tray?

[Eagle 1662]

I thought they were the same thing

[Driftit 2079]

Same thing.

For $200 you can no go wrong. My basic baffle cost that much.

Well there is people running these built into their sumps in the E30 series. But could you consider this just a saftey feature? I guess so. I would say it is more of a saftey increase than a power increase in a series car.

[Silver Fox 43]

Baffles are allowed, scrapers are not, as I was told.

[Silver Fox 43]

how would these differ from a windage tray?

Windage tray, sits under the crank and stops oil splashing back up into the crank area,

Scraper has cutouts which the crank cycles thru, stopping the oil from being held up in the crank cycle.

[Driftit 2079]

Some people have incorperated a scraper into their baffle.

Think it would be a good addition to your car though dave. Design is already done. Some of the baffles are a bit hit and miss.

[westy 614]

How about a windage tray with a vertical scraper in the centre?

2 in 1 perhaps.

[DRTDVL 0]

Do you guys already run a windage tray?

If you minimize the splash with the baffling and a tray do you then need a scrapper?

[topcat 11]

dave, you need it have it.cheaper then a turbo, but will add hundeds of ponies.

the golden rule that most race drivers run by,

if it cost s**t loads it must be fast.

in all seriousness,

buy it,they reckon it makes a difference,only the dyno will tell

Edited April 9, 2009 by BM Weapon aka topcat

[Silver Fox 43]

Must catch up Marty, where's yours at, do you have one?

[DRTDVL 0]

I'm just trying to figure out if you should run both...

[kerrynzl 3]

I'm just trying to figure out if you should run both...

Run both, speaking from experience I got an extra 100RPM at the back straight of Pukekohe with one [ mind you the ol' chevy crank can carry a lot of oil ]

Windage trays are needed to stop oil aeration [ frothing ] drag racers use a "deep sump" for the same purpose

Baffles are needed to stop oil starvation under extreme G's , the best sumps use "trap doors" as baffles

Crank Scrapers keep oil off the crank [ usually on the RH side of the engine ] they reduce internal resistance

I don't use a scraper or baffles now, the alternative is $10K in a dry sump system

If the rules only allowed a stock oiling system, try and run an oil accumulator [ Moroso Accusump ] in the oil cooler lines [ they are external, and can save an engine ]

[DRTDVL 0]

Thanks for that... I understand a bit better now... I was thinking they where an alternative to a windage tray..

[topcat 11]

Must catch up Marty, where's yours at, do you have one?

with luck,will have the motor and box back in the hole this weekend,maybe

cranking to check oil pressure etc.

do i have one??? no,just more boost if you start getting close

simple rule; slow on the corners,nail it on the straights

no baffles needed