Honda/Acura

NEW!  We now have a scraper pattern for the B20Axx series as well as the B21A and B21A1.  Note: These scrapers are unique to these early versions of the B-series engines.  See further down below for the B20B and subsequent engines.  These earlier scrapers attach under oil/bearing structure fasteners.  This same style of scraper has been successfully with the D series engines for many years now.  The steel version of the scraper is $94.95 and the Teflon bladed version is $224.95.

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B-series

Independent dyno testing of the B16 series scraper by Don Flores at DFE in Jacksonville, FL showed a 1.5 % to 2.5 % hp increase depending on RPM.  Remember this is an increase on an engine that already has a full windage tray!  Don performed this testing on our early upstroke single scraper design. Our scrapers are now dual designs -- working on both the downstroke and upstroke.

Here are a couple of pictures of the downstroke blades taken during the manufacturing of a Teflon B18C scraper; the blades reach up into the block. Note that the block it is sitting on is a B16 -- the absence of the stock 3-center-main girdle simply makes it easier to view inside the block.

High performance B-series engines like the high revving B16 and B18C series have multiple oil squirters for each bore.  Many people are not aware that these engines have twenty oil squirters directed at the bottom of the pistons!  The oil that is injected under the piston is critical for removing large amounts of heat and Honda engineers have determined that the large number of squirters is needed for the engine to meet OEM durability standards. Their patent: https://patents.google.com/patent/US6481389B2/en

There are four squirters linked directly to the oil galleys:

... and sixteen squirter slots located on the sides of the rods:

All this adds up to a significant amount of oil that needs to be removed from the windage cloud as quickly as possible and returned to the sump.  Please look at the windage tray pictures a bit further down.

The B16, B18 and B20 scrapers we make come with internal baffles that perform two functions: 1) They help guide draining oil from the head past the rotating assembly; 2) they help to segregate bays 1-2 from 3-4.  In a four cylinder inline engine cylinders 1-2 and 3-4 exchange displaced gas from the rising and falling of cylinder pairs.  Windage with entrained oil follows these exchanges.  It is advantageous to restrict the travel of windage from the first cylinder pair to the second and vice versa.

These pictures illustrate a dual B18C series scraper.

Yes, we do have dual patterns for B20B and B20C engines using aftermarket 5-main girdles:

Dual scraper equipped B16 in flight

Our scrapers are designed to work in concert with the stock windage trays: 

B-series dual scraper with internal baffles (please specify engine): $149.95

Teflon® bladed version: $279.95*

The Teflon® bladed version is designed to safely run at zero clearance for maximum efficiency.  Scott Seck has been running one of our dual Teflon scrapers in his track car for many years:

* The stock windage tray for the B engines NOT using a girdle needs to be clearanced for the Teflon clamping pieces.  We can perform this clearancing for $60 if you wish on your provided new or used stock windage tray.  The girdle equipped B18C series engines have a deeper windage tray that does not require this clearancing.

Modified B series windage trays:

Modified stock windage tray -- suspended directional screening is added to the interior of the tray to capture high speed oil droplets and dissipate their energy -- this also shields the draining oil beneath and helps stop oil from bouncing off the smooth steel and being struck again by the rotating assembly -- all this helps to lower the oil temperature and reduce parasitic power losses.

Here are a couple very interesting pics of used pans sent in by racers.  As I was preparing them for the screen installation it dawned on me to take some pictures to show how much oil there is hitting the inside of the windage tray and the path it follows.

The picture below is after I had sprayed the pan with some WD-40 to loosen the grime.  I then wiped it with a towel and snapped the picture.  The red outline is about where the screening sits.

The next picture again shows the above tray but it is sitting above another tray that I have not cleaned at all -- the witness marks are more intense.  Remember -- this is from long term high-speed "windage" oil impacts -- not from oil splashing up from the sump.  This high speed oil bounces back off the tray and is hit over and over again. 

This picture below shows an example of the clearancing needed for the Teflon® blade and clamp mentioned earlier:

The pictures below show the same screening added to the interior of a B18C5 or B18C type R tray.  The second picture has the girdle resting on it to illustrate how it fits in between the screening panels:

Honda B16-B18 series without girdle: steel scraper version $134.95; Teflon® bladed scraper version$184.95 (includes clearancing the tray). 

Honda B18C5 or type R series with the stock girdle: steel scraper version $134.95; Teflon® bladed scraper version -- also $134.95

Note: These prices do not include the cost of a core stock tray* -- you can send one to us to modify or we can add the cost of a new one to your order.  Current core price is $70.00.

In general, please contact us if you plan on using some combination of parts from different engines or if you are using an aftermarket girdle.  This generally is not a problem but we do need to be aware of it as it will affect the designs.

Again, we do offer custom designs for knife-edged or stroker cranks and a template service if you want to pre-fit a plastic pattern for us to then scan.

We also have internal baffle patterns to suit the excellent Dart block -- the casting is somewhat different internally.

* The stock windage tray for the B engines NOT using a girdle needs to be clearanced for the Teflon clamping pieces.  We can perform this clearancing for $50 if you wish on your provided new or used stock windage tray.  The girdle equipped B18C series engines have a deeper windage tray that does not require this clearancing.