Who runs a crank scraper?
#534550
11/23/09 01:32 PM
11/23/09 01:32 PM
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Joined: Nov 2003
Posts: 6,293
Rock Springs
Bob_Coomer
OP
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OP
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Posts: 6,293
Rock Springs
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Do you like it? IIRC any power gains using one? I was thinking someone made one that was a rough design that you could finish the clearance to achieve maximum oil control. I would say getting it close to the crank and rods as possible or it wouldnt be worth much..Like .050 or so?
Who makes one for a 4.5 stroke crank?
Can one be used with a windage tray?
[color:"red"]65 Hemi Belvedere coming soon [/color]
[color:"#00FF00"]557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package [/color]
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Post deleted by Defbob
[Re: plycuda]
#534553
11/23/09 02:19 PM
11/23/09 02:19 PM
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Anonymous
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Anonymous
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Re: Who runs a crank scraper?
[Re: 440Jim]
#534557
11/23/09 03:51 PM
11/23/09 03:51 PM
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Joined: Apr 2005
Posts: 1,107
Quebec, Canada
Diablo
super stock
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super stock
Joined: Apr 2005
Posts: 1,107
Quebec, Canada
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Quote:
When I put the 4.250" stroke crank in my low deck 400, I made a scraper and welded it to a Milodon stroker windage tray (with added drain holes drilled too).
I did something similar to this in my 496ci. not sure how much it helps but it wont hurt
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Re: Who runs a crank scraper?
[Re: Diablo]
#534558
11/23/09 04:10 PM
11/23/09 04:10 PM
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Joined: Aug 2007
Posts: 498
El Dorado Ca
65signet
mopar
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mopar
Joined: Aug 2007
Posts: 498
El Dorado Ca
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I am running one on a small block, i heard they are worth 15 to 20 H.P.
1965 Plymouth Barracuda 273 M/SA
1970 Plymouth Duster 360/904 10.60s with J heads
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Re: Who runs a crank scraper?
#534560
11/23/09 04:33 PM
11/23/09 04:33 PM
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Joined: Apr 2009
Posts: 169
Nazareth,Pa.
JACKSON
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Posts: 169
Nazareth,Pa.
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Quote:
I have beeen researching wet or dry sump. pan design, pumps
scrapers ,baffels and trap doors for more than a week now.
crank scrapers might look good but the Mopar big
block design limits their effect. Oil just bounces everywhere uncontrolled. I can remember seeing theB1 pro stockers with the passenger sides cut out to allow a larger kick out. No scrapers would do the job. Hemi and wedge blocks having the full skirt prevents the same benefits as say a Chevy design. My findings are good tray and scraper on the pan itself seem to be the most productive.
HEMIFRED, i'm looking into the same thing right now, not sure of what pan i need 1196 hp.
stock K frame 69 style?
what have you come up with for a pan?
jeff johnson, Charlies modified, 
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Re: Who runs a crank scraper?
#534565
11/24/09 03:42 AM
11/24/09 03:42 AM
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Anonymous
Unregistered
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Anonymous
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Quote:
I have beeen researching wet or dry sump. pan design, pumps
scrapers ,baffels and trap doors for more than a week now.
crank scrapers might look good but the Mopar big
block design limits their effect. Oil just bounces everywhere uncontrolled. I can remember seeing theB1 pro stockers with the passenger sides cut out to allow a larger kick out. No scrapers would do the job. Hemi and wedge blocks having the full skirt prevents the same benefits as say a Chevy design. My findings are good tray and scraper on the pan itself seem to be the most productive.
The classic SBC scraper (and for the LA series) works principally by disrupting the windage cloud at high rpm. It has a 90 degree angle of attack.
This type of scraper works by lowering the equilibrium level of entrained oil in the cloud. There are many angles of attack and scrapers are commonly deployed in the first three quadrants of rotation ATDC. Not so common is to find scrapers being used in the fourth quadrant. As far as parasitic energy loss is concerned, it is desireable to strip excess oil from the rotating assembly as quickly as possible, i.e. earlier quadrants.
Pan floor mounted scrapers are commonly found in the Ford engines like the FE and Modular V8. Mercedes and Porsche use them as well.
The difficulty here is that it is hard to run close clearances with accuracy since the pan is not precisely located and clearances are by inference not observation. A variant of this approach might be to alter the angle of attack of the louvers in a tray. Usually the limitation here is how much people are willing to pay for the devices.
To reduce the windage and pumping effects, lower the atmospheric level in the sump. You are again lowering the equilibrium point of the entrained oil. Nifty ideas like this that work are quite often illegal because they work (and it was not present on the original engine).
If your pressure stage pump is relying on the head in the pan you have to be cautious about drawing extreme levels of partial vacuum. The pump must still be able to impart enough pressure to keep aeration in the oil completely dissolved or the bubbles very small in diameter.
It is interesting to look at the stock full length windage tray for the GM LS engine. The architecture of the block is similar in many ways to the B/RB and Modular V8. A well used tray will reveal witness marks that show chaotic flow in and between the center two bays. Proportionately less oil is released from the windage cloud here despite the nearly equal distribution of louvers the length of the tray.
Things to think about.
Lastly, the SBC design is highly constrained by the tightness of the block walls to the rotating assembly. The Dart block with spread pan rails was not by chance and not merely to allow bigger strokes.
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Re: Who runs a crank scraper?
[Re: hemi-itis]
#534566
11/24/09 09:30 AM
11/24/09 09:30 AM
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Joined: Jan 2003
Posts: 75,386
A gulag near you.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,386
A gulag near you.
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Quote:
Cam/lifter cover 
that's a nice piece , does that look like a piece of cut think wall pipe or was it rolled sheet stock ?
I wonder if Jimmy makes and sells these, I could use a couple .
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I mske my own, not hard to do 
