What the hell is it?

 

Way to be sepecific

Ive never heard of a crank scraper... what is it used on or for?

 

"Block-High Scraper can be trimmed to your particular rotating assembly to reduce windage and increase power. "
from: http://www.moroso.com/articles....html

it's just basically something that contours the crank and prevents oil from being shot upwards when the balances are spinning.

 

u have a windage tray for that reason, u don't need a crank scraper.

 

The stock windage tray doesn't do ****.

 

Crank scrapers are for v8's, most of them are splash lubrication motors, the crank hits the oil and splashes it to lubricate the rods and pistons and keep the temp. down in the crank case. The gsr has oil squirters, so there is going to be oil all over the rotating assembly no matter what. Thats why u dont need a crank scraper. And the windage tray does do a lot of ****.

 

I see. Thanks alot guys.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by leadfoot78 &raquo;</TD></TR><TR><TD CLASS="quote">Crank scrapers are for v8's, most of them are splash lubrication motors, the crank hits the oil and splashes it to lubricate the rods and pistons and keep the temp. down in the crank case. The gsr has oil squirters, so there is going to be oil all over the rotating assembly no matter what. Thats why u dont need a crank scraper. And the windage tray does do a lot of ****. </TD></TR></TABLE>

Hi,

Crank scrapers are not just for V8 engines. In fact, they are OEM equipment on many stock engines from BMW, DaimlerChrysler, Mazda, Ford, and Nissan (among others). The new SRT-4 from DaimlerChrysler, for example, uses a crank scraper. These engines include L4, L6, and V6 designs. The modern BMW M52 straight six uses crank scraper louvers in its windage tray just like the Pontiac GTO 389 V8 of 40 years ago.

Many Honda engines have girdle like structures (oil passages) that connect the main caps. Look at the oil pan from a Nissan 300ZX VG30 -- it also has these girdle structures on the main caps and its oil pan has *at least* seven different oil scraper devices. It also has a baffle for the sump pickup, a kick-out for the sump and a windage tray (with crank scraper louvers).

Windage trays, crank scrapers and baffles are all distinct devices though sometimes combined. The Honda windage trays, such as in the B16, do not have crank scrapers built into them. The function of a windage tray is to physically block sump oil from splashing onto the spinning bottom end. The function of a crank scraper is to remove the windage cloud. The windage cloud will still form even if the sump oil does not splash on the crank. That is why windage clouds form on non-moving engines hooked up to dynos despite having windage trays.

Chrysler and Mobil Oil did joint research on the windage losses in the Shelby 2.2 Charger four cylinder engine back in the mid 1980s. They regained 7hp at 6000 rpm and 9hp using Mobil-1 with a crank scraper type windage tray. I spoke with a retired engineer who worked on the project.

This is an extremely well proven technology (40 years of empirical data at least) and is commonly used by professional automotive engineers the world over.

Kind regards,

Kevin Johnson
Ishihara-Johnson Crank Scrapers

 

Sounds like you know a lot about this, it's nice to see people like that joining the site. So talking about the windage cloud and how the crank scraper reduces the oil content in side the cloud. There is a lot of members here that have turbo B series engines that make quite lot of power and use baffled catch cans that fill up with oil sometimes too quick. The motor would still create some serious crank case pressure because of the loose ring gaps and all, but the oil content would be reduced. From what you described the crank scraper would help with that too, am I right?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by leadfoot78 &raquo;</TD></TR><TR><TD CLASS="quote">So talking about the windage cloud and how the crank scraper reduces the oil content in side the cloud. There is a lot of members here that have turbo B series engines that make quite lot of power and use baffled catch cans that fill up with oil sometimes too quick. The motor would still create some serious crank case pressure because of the loose ring gaps and all, but the oil content would be reduced. From what you described the crank scraper would help with that too, am I right? </TD></TR></TABLE>

Yes, the crank scraper would help reduce the oil content of the windage cloud and keep that oil in the sump. Crank scrapers and windage trays should both be used if at all possible.

The 2.2 Shelby (versions of it) had a turbocharged engine as well. The engineer that I spoke to said that up to 4 1/2 quarts of oil could be drawn into the cloud around the crank just prior to engine failure. I had difficulty believing that figure and asked him again (this is fairly close to the sump capacity).

He said that a cascade failure of the oil system occurs -- the oil is drawn into the rotating assembly and becomes aerated. The whipping action itself generates even more heat in the oil and this causes the existing bubbles to expand thereby making the problem worse. Also, he explained that when the oil reaches a high enough temperature it actually becomes thicker (the additive package helps to control this).

Meanwhile, aerated oil is being circulated by the oil pump and this is not good for the bearings, of course, and it will also change the clearances in hydraulic lash adjusters, again not good.

 

How can a crank spraper work if the motor has a windage tray blocking the crank from the scraper?


Modified by Muckman at 5:50 PM 7/10/2004

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Muckman &raquo;</TD></TR><TR><TD CLASS="quote">How can a crank spraper work if the motor has a windage tray blocking the crank from the scraper?


Modified by Muckman at 5:50 PM 7/10/2004</TD></TR></TABLE>

Hi Muckman,

The Hondas that I have seen do not have windage trays that would block our scraper. The tray for the B-series, for example, installs over our scraper. There are pictures on the website of the scraper with and without the tray.

There are some engines that have so many existing scraper devices that there really isn't room for any more to be added. My wife and I looked at a new Ford 4.6 V8 that a local performance shop was building up and it had at least four separate scraper devices from the factory (I am not exaggerating at all when I say that this is an accepted proven technology with professional automotive engineers).

Kind regards,

Kevin

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by leadfoot78 &raquo;</TD></TR><TR><TD CLASS="quote">Crank scrapers are for v8's, most of them are splash lubrication motors, the crank hits the oil and splashes it to lubricate the rods and pistons and keep the temp. down in the crank case. The gsr has oil squirters, so there is going to be oil all over the rotating assembly no matter what. Thats why u dont need a crank scraper. And the windage tray does do a lot of ****. </TD></TR></TABLE>

We just did dyno work on a _3_ cylinder 993cc Metro engine with a _full windage tray_.

Horsepower still increased an average of 3% (four dyno pulls gave data ranging from 2.5% to 3.5%). Power increased from roughly 2750rpm to 5300rpm.

You can see the dyno results on

http://www.crank-scrapers.com

 

A Honda racing team just got back to us -- they picked up between 1.5% and 3% with the D16 depending on rpm. A lot of people thought the girdle structure would greatly inhibit windage but there is still significant power to be found.

 

I'm having trouble visualizing what this thing is exactly...does anybody have pictures or a diagram?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Lsos &raquo;</TD></TR><TR><TD CLASS="quote">I'm having trouble visualizing what this thing is exactly...does anybody have pictures or a diagram? </TD></TR></TABLE>

try that link that's posted 2 posts up from yours.

s