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What a crank-scraper is and other technical info... Some comments on our products...
 
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Modified stock Mopar windage tray and special scraper

Teflon bladed TR2-TR4 crankscraper and dual windage tray to work with modified pan below

Triumph TR2-TR4 updated pickup

 

Modified TR2-TR4 core pan

Triumph TR7 scraper and pumping exchange baffle

Updated Toyota 4A 20v windage tray

With steel scraper:

Updated Toyota S-series Teflon scraper and windage tray

Custom windage tray, crank scraper, pan baffles and pickup tube for Dodge 2.4

The customer supplied a custom fabricated steel pan

An anti-surge baffle with venting and integrated dipstick guide tube was installed as well as a longitudinal baffle with dual trap doors

A standard "Eclipse" type pickup tube was sectioned and positioned closer to the pan floor to increase the G-rating of the sump as well as to allow the Mopar anti-vortex dimples to function properly.  The tube was reinforced with two straps.

The windage tray assembly was modified in a number of ways to fit the interior of the pan.  A dipstick guide was included that works in tandem with the guide present in the pan.

Steel or Teflon bladed scraper for Fiat 1100 "Fire Engine"

Dual scraper for Alfa Romeo straight fours.  Two  liter stroke shown.  Compatible with many dip stick locations, OEM and aftermarket windage trays.

Many thanks to Pete Exton for his extraordinary help with this design.

Updated Porsche 944, 951, 968 Teflon bladed dual scraper and windage tray

The screening section and steel downstroke scraper are removable from the assembly so that the Teflon bladed upstroke scraper may be fitted first

This jig holds the bedplate of the engine in the correct relationship with the pan (951 pan shown).  The windage tray assembly and scraper nest with no modifications needed to the pan.

Updated Porsche 944, 968 Teflon bladed scraper

Knife-edged version of 944 Teflon bladed scraper

Updated Mopar 340 Teflon scraper

Mopar A, LA racing downstroke scraper with directional screening and adjustable scrapers.  This pattern was specifically developed for use with aftermarket halo girdles on two bolt main blocks.

Updated BMW M30 Teflon scraper for 3.0 engine

Studebaker four bolt main Teflon 289

Honda H22 Teflon pattern updated

Ford EAO "Pinto engine" steel pattern updated; YB available as well

Ford FE Teflon pattern for aluminum Shelby block, 4.375" stroker

SBC scraper for late LT1 -- thick steel to use with sectioned one piece gasket (Fel-Pro shown); can be used with two or four bolt mains.  Also available without dipstick hole and with different strokes.

Teflon bladed version of late LT1 scraper for use with sectioned one piece gasket (dip stick hole deleted):

Updated full directional screening windage tray for SBC, including late LT1.  Provisions for two and four bolt mains.

Updated dual Teflon scraper and windage tray for Lancia using the FIAT 2.0 engine

V6 Toyota 2GRFE

In addition to steel and Teflon bladed scrapers, as with the Nissan V6 below a modified windage tray is available

V6 Nissan VQ37VHR

We have received feedback and dyno testing indicated that the combined system below significantly improved the output of the stock engine from 4400 rpm, peaking at over 3.5% gain at 7500 rpm.

BMW M30 dry sump

BMW S14 updated design

The scraper pictured below is an update of our S14 Teflon design (in this case for a knife-edged crank)

Steel and Teflon bladed scrapers for the Brian Crower KA24 stroker crankshaft

Steel and Teflon bladed crank scrapers for the Nissan CA18DE and CA18DET

Studebaker V8 windage tray with adjustable louvers and directional screening; this is a copy of the factory R series tray but with louvers and screening added -- it is welded into the stock pan.

Studebaker V8 crank scraper available in steel and Teflon bladed versions for the 289 and 259

Circle track modifications for the Dodge 2.4

Toyota 4AGE 20V

Modified factory 4AGE tray -- directional screening is added to the interior to dissipate the energy of high speed oil droplets.  The border and tray is sectioned to match the 20v oil pan rail and drainage is added.  A 20v Teflon bladed scraper is also shown that works in harmony with the scraper.  The scraper is for a custom crankshaft that has been knife-edged.

AMC Straight Six 4.0, 258, 232 update

Directional screening downstroke panels

  

Chrysler Slant Six

Updated based on our successful design for the BMW M20 and M30 slant six

Chrysler Early Hemi

354, 392 variants. 

The downstroke scraper has drainage shields to protect oil from windage as it proceeds to the pan floor.

Directional screening windage tray for 4.6 Rover with steel pan (enquire about similar trays for earlier engines).  The tray attaches to separately available dual scrapers.

Modified Milodon Windage Tray for Ford FE

The windage tray has drain ports added and an interior layer of directional screening making it a dual layer tray.  The modifications vary depending on the block style and type of crank scraper it is working in harmony with. 

Modified Milodon Windage Tray for Mopar B, RB

A special scraper design works with it to allow oil to pass beneath the tray on the downstroke

Modified components for Raceline® Ford Zetec wet sump pan

Raceline® manufactures an excellent aftermarket sump for the Ford Zetec:

The parts we manufacture enhance the performance of this pan.  The pan uses two levels of windage tray:

The lower tray seals the casting thereby creating a surge baffle as well and provides three major drain holes for oil returning to the sump.  The small remaining hole is to allow the factory dipstick to pass through.  The pressed curved tray on top is a Ford item (the design varies).

The Ford tray has a smooth metal interior that allows oil droplets to strike it and bounce back up and be struck repeatedly by the rotating assembly.  The energy lost in this way can never be recovered.

The lower baffle creates a de facto second sump when the engine is under prevailing lateral accelerations. Typically these sumps are found in vehicles generating well over 1G of lateral acceleration (45 degree angle for the oil in the sump) and during braking. The oil collects along the sides and in the corners and cannot return to the lower part of the casting.  When enough oil collects the oil floods the upper windage tray and is churned by the rotating assembly. 

An ingenious oil pickup is employed that removes it from interfering with the rotating assembly and still places it in an ideal central location.  One drawback is that the pickup tube is not equipped with a mesh filter to stop large items from being ingested by the oil pump.

The parts we make work to help correct these issues:

The parts have larger drain back holes.  These holes have mesh screening that acts to filter the oil prior to its returning to the lower sump.  Triumph employed this general technique in the Mark 1 2000 straight six and Porsche in the original 928 wet sump design.  The dipstick hole has a high collar welded around it that acts as both a guide and to ward against detritus using this opening as a passageway to the lower sump.

The lower tray also has a central baffle that acts to shunt oil traveling along the walls and floor of the sump prior to its collecting in the corner.  This will also help feed the oil pump as the central chamber contains the pickup opening.

The upper windage tray has a solid surface beneath to help stop oil from splashing onto the rotating assembly and a directional screening layer on top to grab high speed oil droplets and let them drain through.  The center of the tray has a vertical baffle to encourage balanced pumping exchanges between bays 1-2 and 3-4.  This also helps hinder entrained oil in a windage cloud from migrating fore and aft in the engine. 

These parts are designed to work in combination with the oil scraper sets that we make for the Zetec engine if that is desired.

GM LS Engine

There are scrapers and modified stock windage trays available. 

The tray shown is GM part number 12558189 which is the full length one.  There are multiple stock patterns that the same general modifications can be performed on.

The principal aims were to introduce a small amount of additional order to the windage flow and to extract more entrained oil from the cloud.  A divider was used in the center to encourage the flow pattern to circulate in bays 1-2 and 3-4 rather than simply have chaotic flow over the third main.  The louvers were extended inward on the downstroke side and then had this element transition into directional screening on the floor.  This screening rises above the lowest louver on the opposite side of the tray.  This transforms the lowest louver openings into drains (additional drain holes drilled as well).  However, because of the orientation of the screening openings (iterated small louvers) the total amount of "louvered" area is greatly increased.  The screening helps prevent oil from bouncing back up after striking the interior tray surface and protects oil that has passed through it and is then flowing out of the tray.

The uppermost upstroke louvers have been opened up a bit and the scraper serves as a new and far closer edge to guide stripped oil into those openings and also to reach in and disrupt the pressure differential of the windage cloud.  The scraper moves the windage tray approximately 1.5mm closer to the floor of the pan.   

Overall, this is an enhancement of the original design going beyond what is possible with a single stamped piece of metal.

It is thought that the destruction of these engines at high G's is mostly due to oil migrating into the rotating assembly and being trapped by the windage tray and the network of passages through and over the mains/webbing.  It becomes churned full of air before being ejected and this increased aeration is what kills the bearings.  Entrained air requires more time to be released than simple foaming on the surface. The scraper and modified tray helps to more quickly extract this oil while still allowing pumping exchanges between cylinders and bays.

The scraper and tray can be used independently of one another  if desired.  Stroker and Teflon bladed versions of the scraper are available.

Important note:  If you want a tray to be modified for use in a stroker engine you must fit the stock one to your rotating assembly and then send it to us. 

Updated product

A racer in Canada recently requested a dual Teflon scraper and windage tray for his Volvo B20 engine.  The windage tray design was adjusted from a previous version to accommodate the drain ports on the downstroke side of the block.  The windage tray is designed to work with or without the scraper and is set up to be used on the B20, B21, B23, B230 and similar engines.  Provisions are present for two different dipstick locations. 

Above and below: the tray nested with the Teflon dual scraper framework.

Below: the Teflon dual scraper framework and insert.

New Product

Crank scraper for the Nissan RB26DETT engine

One of our customers was kind enough to ship us a block to enable us to design this product.  For clarity, the stock windage trays normally covering the girdle have been removed as well as the pickup tube.  We also have a pattern for the RB25.

New Product

Modified windage tray for the Moroso alloy pan for the Toyota 1ZZ and 2ZZ engine

Above and below: the stock insert shape has a layer of suspended directional screening to dissipate the energy of high speed oil droplets expelled and/or stripped from the rotating assembly. It is shown positioned over our crank scraper pattern for these two engines.

Updated Product

Mazda BP Teflon scraper and modified tray

When we first made scrapers for the Mazda Miata 1.8 they were positioned along the pan rail.  They are now located along the main bearing caps.  A racer contacted us who had engine blocks and pans that were specially machined to accept this earlier design.  In support of our customer, we designed a Teflon bladed version, furthermore for a knife-edged crankshaft.  In addition to wanting a Teflon bladed scraper he wanted us to add directional screening to the interior of his stock windage tray.

This design is certainly effective and we moved away from it only because it required some adjustments in order to achieve good mating between the transmission bellhousing and oil pan.  The new design along the main caps has been in place on cars winning national SCCA championships.  This older -- but supported --design should be strongly considered if you are using aftermarket main bearing caps or modified OEM ones.


Contact Information

Telephone
727 808 8602
Postal address
P.O. Box 2168, Land O' Lakes, FL 34639-2168 USA
Electronic mail
Customer Support: sales@crank-scrapers.com           

Copyright 2002-2017 © All rights are reserved on our product designs -- a great deal of hard work goes into each one.

Teflon® is a registered trade mark of E.I. du Pont de Nemours and Company. Only DuPont makes Teflon® resin sourced by Ishihara-Johnson Crank Scrapers from authorized DuPont licensees.

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Jean-Claude 1919-2003
A good friend.