I would love to see a back to back dyno test, I'm thinking it may only
become significant at the higher rpm levels, and it seems that knocking
the oil down in the sump faster may help make sure the pump always picks
up clean oil and not any air or froth if you were whipping the car
around at an autocross or something. I was really hoping there was an
expert out there who could share some first hand experience, and verify
that there are no downsides to using one, even if the benefits are an
unknown quantity. On stroked motors you would have to modify the
scraper, cut those grooves a bit deeper during the assembly process.
Since I'm getting a free one I am planning on using mine, but I won't
have anything to compare it to.
Daryl
-----Original Message-----
From: owner-mgb-v8@autox.team.net [mailto:owner-mgb-v8@autox.team.net]
On Behalf Of David Kernberger
Sent: Thursday, July 10, 2003 10:06 PM
To: James J.
Cc: mgb-v8@autox.team.net
Subject: Re: Crank scrapers
7/10/03
James & others,
Thanks for the response. A simple enough idea once one gets the
hang of it. It is, however, very hard for me to imagine enough oil
clinging to the rotating crank and rod big ends to be a significant drag
or weight hinderance. Is there really any measurable difference??? I
suppose a different pattern would be required if one is doing any
stroking, like with a Buick 300 crank, or whatever-----. A new word in
my mechanical vocabulary.
Cheers,
Dave Kernberger
------------------------------------------------------
>A crank scraper is a thin piece of metal that runs the length of the
>sump. One edge is mounted to the block, and the other side is cut to
>match the profile of the crank shaft. It almost looks like a house
>key. As the various rotating parts of the crank pass through the plane
>of the scraper, any excess oil is ripped off the crank. This cuts down
>on drag, reciprocating mass, and keeps the oil in the pan. "scraper"
>is a bit of a misnomer, since it and the crank never actualy touch,
>there is just enough margin for it to pass through but not bring much
>oil with it. Hope this helps. James J.
>
>
>David Kernberger wrote:
>
>>7/9/03
>>\
>>Daryl,
>>
>> Please pardon my ignorance but what in heaven's name is a crank
>>scraper????? I'm trying to pkcture such a device and am failing
>>miserably. Thanks in advance.
>>
>>Regards,
>>David Kernberger
>>
>>------------------------------------------------------
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