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What a crank-scraper is and other technical info... Some comments on our products...

We will try to keep this list updated but if you do not see your engine listed here please ask!  We can  do custom stroker or knife-edge crank designs.  We can provide plastic templates for initial fitting and adjustment. Plastic templates cost $100 and are a separate charge from the scraper pattern chosen.

We have included some representative pictures of the scrapers we make.  If you would like to see a picture of a particular scraper please ask -- we would be more than happy to send one through.

When available (please enquire) our zero-clearance Teflon® scrapers run an additional $130.00 to the cost of the standard steel scraper unless noted.

Remember, your vehicle may have an engine made by a different manufacturer so check both product lines.  If you are still unsure, please contact us.

crankscraper, crank-scraper, crank-scrapper, crank, crankshaft, rod-bearing, main-bearing, connecting-rod, counterweight, piston, windage, windage-tray, windage-cloud, oil pan, oil-pan, oil-aeration, oil-foaming, oil-cloud, racing, drag racing, road racing, drag-race, road-race, road-course, drift, drifting, time-trial, performance, power, horsepower, HP, torque, TQ, friction, vacuum, economy, engine, motor




Copyright 2002-2024 © All rights are reserved on our product designs.

Latest:  modified tray for LS7 and LS9:

Latest: LS7 Teflon bladed crank scraper:

 Our windage control items helped with the top performing LS engine in the 2013 Amsoil Engine Masters Challenge. http://www.popularhotrodding.com/enginemasters/1309_2013_amsoil_engine_masters_challenge_friday_coverage/viewall.html

LS V8 engine scrapers and modified windage trays:

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. 

The scraper is $94.95 (Teflon $224.95) and the modified tray is $264.95 (core charge is additional).

Teflon bladed LS crank scraper:


NEW!  Scraper specifically for the ZZ4 and ZZ430 crate motors from GM Performance:  $94.95

L4: 134; 2.5 liter engine (1988 block with gear on crank)  $94.95; We also have a steel and Teflon® bladed Iron Duke racing block/crank pattern -- please enquire.

Drawing of current wet sump pattern:  

Teflon-bladed patterns to fit dry sumped racing engines (block and dry sump pan shown):


Copyright 2002-2024 © 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
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