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

crank scraper, 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





The M20 pattern is a dual-scraper -- the added blade operates on the downstroke and shunts the oil to the side of the pan.  M20 (L6): 2.0, 2.3, 2.5, 2.7   There are NUMEROUS variations that we have made over the years for stroked and stock engines.  Please enquire.

$124.95 [steel]; $254.95 [Teflon®]

Please note that stroker versions using an 84mm or greater stroke are more expensive because the frames are more complicated to make.  The IX pattern is listed separately below as well.

Important information for people swapping in 84mm crankshafts: There are versions of the crankshafts with larger outer diameter counterweights.  We have patterns to fit both -- if you do not specify that you have a smaller diameter counterweight crankshaft  you will be sent a version for the larger style.  From patterns that have been test fitted by customers in the past the difference in OD is approximately 4mm or 2mm at the scraper.  Picture below:

$154.95 [steel]; $284.95 [Teflon®]

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

Our M20 scrapers are very popular in NASA Spec E30 racing.

Some brief remarks about the M10, M20 and M30 engines with respect to oil control: These engines were designed with then contemporary elements, e.g. oil was allowed to drain onto the rotating assembly from the head.  BMW US patent number 4,773,366 for a "Non-foaming crankcase configuration for piston internal-combustion engines" illustrates some of the engineering philosophy changes that went into the families of engines that replaced them.  In 1994, SAE paper 940792 from FEV Motorentechnik, Aachen was presented that also goes over these design elements.

The crank scrapers we manufacture follow this design philosophy and extend it, particularly for vehicles that are used in extreme duty or competition (see "Kibort Effect").  We have had very favorable feedback over the years for these designs.  It is worth noting that the designs have been updated in at least nine generations over ten years which is extremely rare among aftermarket manufacturers.  The M30 design was one of our very first products and is part of our company logo.


Steel version above

Custom steel stroker version above

Teflon® version pics immediately above and below

Here is a picture of a custom Teflon® stroker:



M20 IX pattern (all-wheel drive -- the drive shaft passes through the sump) is now a dual-scraper -- the added blade operates on the downstroke and shunts the oil to the side of the pan. 

Copyright 2002-2024 © All rights are reserved on our product designs. $214.95

Stroker versions of the IX pattern over 84MM are $234.95 because of the added complexity.  There are no Teflon® versions of the IX pattern available.

M20 IX


Various M20 examples:

A picture of a special M20 2.0 version -- the cross supports allow the scraper to be used as a light duty girdle when studs and spacers are employed:

Custom M20 stroker:



These pics of earlier patterns show the trap doors and how the pattern sits with respect to the pan.



Chuck Taylor, racer and owner of Factory 3 Performance writes:

This is what I know about crank scrapers:
Don't install an oil pressure gauge if you aren't planning to also install a crank scraper.

The factory oil pressure warning light is set to come on at around 7-8psi.  Your warning light probably never illuminates while driving. 

Once I installed an oil pressure gauge, I found that in the fast left hand corners (like T3 at Roebling) the car was dropping from 50PSI to around 16.  Not good.  Especially at 5000+ RPM.  Even running a quart over full didn't help.  Talk about too much information!

We installed one of the crank scrapers over the winter, and now the car holds full pressure everywhere on track.


We also suggest using a sump baffle to control surging in the area surrounding the pickup tube head.  Here are three different sources for this type of product:





Customer Jay Bishop was kind enough to send us the photo of his installed pan baffle seen below.  

"The part I'm holding is the OEM baffle, oriented approximately the same as the weld in baffle. One side is held in with 2 pins that go into 2 rubber bushings into 2 holes on the wall of the oil pan. On the weld-in baffle you can see the plug welds on the back side of the pins, towards the top of this image. On the opposite side of the baffle is an aluminum rivet that you have to cut the head off of to get the baffle out.

"Also I decided to grind off a lot of the flash in the pan left behind by heat cracks in the mold."

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
A good friend.