Author Topic: Crank scraper??? (Read 5114 times)

jtanguay · « **on:** March 17, 2005, 10:05:44 am »

I'm wondering if this would benefit my engine:

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1&item=7961770950&category=46098#ebayphotohosting

Seems that crank scrapers have good reviews, but I'd rather ask some experts on here before I buy something like that.

Thanks!

Dr. Diesel · « **Reply #1 on:** March 17, 2005, 01:15:59 pm »

probably would, but i think the OE windage tray would be more effective.

dieselpower · « **Reply #2 on:** March 17, 2005, 10:53:16 pm »

umm...how much power do you expect to get out of removing the "parasitic drag" of oily air? also wouldnt you want that oily mist to help lubricate the other engine parts that dont normally get oiled?

just my 2 cents

Mark

jtanguay · « **Reply #3 on:** March 17, 2005, 11:30:37 pm »

Well there shouldn't be any problem for lubrication with the oil squirters. This seems like a really good idea, mainly because it makes sure there is oil in the pan--where it is needed when going from high rpm to low rpm.

I don't expect much in terms of performance, but maybe extended engine/turbo life possibly???

Dr. Diesel · « **Reply #4 on:** March 18, 2005, 09:12:01 am »

i don't think it's a problem with oily air as much as the 'wind vortexes' from the spinning crank actually vacuums oil up out of the oil pan. That's what the windage tray would prevent. i'm not sure if a crank scraper would do the same.
If you've ever seen an aircraft propeller spinning over a puddle, you'd know what I mean. I used to work on DC-3's, and with the tailwheel on the ground, their prop arc is 3 feet off the ground at it's lowest point. Even at idle, it would suck a puddle dry by the vortexes formed. They look like little mini tornados. So in an engine, where the crank spins 3-4 times faster than an aircraft prop, and only 2-3 inches away from the surface of the oil, I can only imagine what kind of a mess it is in there. That crank's likely acting like a riverboat paddle wheel. Windage trays are cheap hp, even if it's only a few, on a 68hp engine it adds up quickly.

jtanguay · « **Reply #5 on:** March 18, 2005, 10:13:07 am »

well I think I'll try it, just for the sake of protecting my engine during hard braking (coming off the highway for example)

An extra 1-3 HP would be nice too

Dr. Diesel · « **Reply #6 on:** March 18, 2005, 03:57:58 pm »

try it, the scraper, or try it the windage tray? Windage trays are cheaper than that thing and better.

jackbombay · « **Reply #7 on:** March 18, 2005, 05:57:56 pm »

Here is some good info about Scrapers and Windage trays and how they are different. Scrapers are more of a high RPM thing, so not as usefull with a 5K redline as a 7K redline, I of course don't kno how far *you* wind it up.

jtanguay · « **Reply #8 on:** March 18, 2005, 10:53:24 pm »

hmmm... Dr. Diesel, do you have any pics of a windage tray? Any test results? Where would I get one?

Thanks for the info!

srivett · « **Reply #9 on:** March 18, 2005, 10:57:54 pm »

The windage tray is a 1.9 IDI oil pan gasket.

Steve

Dr. Diesel · « **Reply #10 on:** March 19, 2005, 12:40:11 am »

what he said.

andy2 · « **Reply #11 on:** March 19, 2005, 06:01:14 am »

I have the 1.9 gasket/ windage tray on my 1.6,its the same bolt pattern incase your wondering.

Kevin Johnson · « **Reply #12 on:** March 21, 2005, 09:07:03 pm »

Quote from: "Dr. Diesel"

probably would, but i think the OE windage tray would be more effective.

Most of the dyno data we have so far comes from engines with full windage trays like the tray insert that goes in the VW. The VW tray does have some small crank scraper louvers in it in case anyone is wondering. (Many people ask why scraper tech is not included in their engine if it is such a great thing.)

Also, the dyno data on the Suzuki G10 shows power improvement from ~2750 rpm through peak hp at ~5300 rpm so you don't need a 7000 rpm engine to see an increase.

You could place the scraper between the windage tray and block -- that would be optimal -- you should use both if they are available. 25 years ago I was using Drake Engineering oil pans with scraper louvers on watercooled VW engines so the tech has been around for some time.

Kind regards,

Kevin Johnson

Author Topic: Crank scraper??? (Read 5114 times)

andy2