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What a crank-scraper is and other technical info... Some comments on our products...
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We can  do custom stroker or knife-edge crank designs.  We can provide templates for initial fitting and adjustment. 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 2002-2023 © All rights are reserved on our product designs.

Remarks on Porsche 928 2/6 and 944 2 rod bearing failure

Kibort Effect

Kibort Effect understeer   http://www.youtube.com/b1JSv6WxigU

Kibort Effect neutral   http://www.youtube.com/NUh7KtFq09Y

Kibort Effect oversteer   http://www.youtube.com/-E5jNo0KfEk

Porsche 944, 951, 968 L4: 2.5L 2479cc and 2.7L 2681cc (both 78.9mm stroke as used in 944 variants); 3.0L 2990cc (88mm stroke -- as used in 968, stroked version of scraper)   $94.95


Teflon® stock and knife-edged versions$244.95; the Teflon® version includes the rear screening found on the windage tray setup.



Windage tray setups:  The windage trays have either the steel or Teflon bladed upstroke scraper removably built into the framework -- this is so the scraper can be adjusted without the screen in the way.  In addition, the windage tray setups have a downstroke scraper that bolts onto the frame.  The downstroke scraper was originally used in the 928 windage tray setup and has been adapted over.  The 944/968 engine is derived from the 928 V8.


These pictures show the assembly nested in a 951 pan with no modifications needed to the pan or baffle; the jig holds the bedplate the correct distance away from the pan (accounting for the 8mm thickness of the pan gasket):


You must first determine whether you have what we term an "early" or "late" style pan (968 and some earlier engines).  There are a number of different pan variations but for the windage tray it is the style of the internal ribs that is important.  The style of the internal ribs determines the screening pattern used.

This is the "early" style: 

This is the "late" style: 

$524.95 for the steel version; $654.95 for the Teflon bladed version.

We also make an oil pickup support bracket for the 944/951/968 engines that can be used with our products or by itself.  The customer uses the engine as a jig and the bracket can be brazed or welded into place: 



July 2nd, 2008:

I installed my 944 Turbo Windage tray/Teflon crank scraper and I’m happy to report my oil pressure is consistently 1 bar higher than previously.  Normally after working the engine at sustained high rpms and coming back down to idle I would see the gauge fluctuating above and below the 2 bar line.  Now under the same driving conditions using the exact same oil, I never see below 3 bar at idle.  I just thought I’d share my experience with your product.

Thank you,

Chris Jurkiewicz


July 29th, 2006:

The Porsche 944S Scraper and Windage tray you made up for us WORKS GREAT!
The engine revs more freely near the top and really pulls. It would actually labor at the top end of the range before.
I wish we had a chance to hit the Dyno but the performance I would say speaks for itself.

Todd Randolph



Copyright 2002-2023 © 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.