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Do crank scrapers work?

 
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opmatt21  



Joined: 31 Aug 2004
Posts: 1

PostPosted: Mon Sep 06, 2004 2:22 pm    Post subject: Do crank scrapers work? Reply with quote

I'm a new 924 fan looking into buying one soon. I came across this in ebay and was wondering if anybody has experience with this on a porsche or any other car. I've never heard of them before and it sounds like one of those As-Seen-On-TV gimmicks. Thanks -Matt
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=46098&item=7919818911&rd=1
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924RACR  



Joined: 29 Jul 2001
Posts: 8280
Location: Royal Oak, MI, USA

PostPosted: Mon Sep 06, 2004 11:14 pm    Post subject: Reply with quote

That's the one I'm using on my racecar, from crank-scrapers.com. Excellent product, minimal fitting required (though not completely bolt-on - they never are). I would recommend them (from these guys), if you are in need of one.

Do you need one? Hard to say. If you're not racing and not rebuilding a motor - I certainly wouldn't bother. I still don't have an oil pressure sensor plugged into my data system, so I still don't know how much the scraper helps on turns. I do know my engine pulls hard and holds oil pressure OK, but there are many things I've changed, so who knows how much of that is a crank scraper.
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Vaughan Scott
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'79 924 #77 ITB racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype
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Kevin Johnson  



Joined: 11 Jul 2004
Posts: 8

PostPosted: Fri Sep 10, 2004 12:29 am    Post subject: Re: Do crank scrapers work? Yes. Reply with quote

opmatt21 wrote:
I'm a new 924 fan looking into buying one soon. I came across this in ebay and was wondering if anybody has experience with this on a porsche or any other car. I've never heard of them before and it sounds like one of those As-Seen-On-TV gimmicks. Thanks -Matt
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=46098&item=7919818911&rd=1


We just did dyno work on a 993cc SOHC three-cylinder Metro engine. The design was one that attaches to the main caps like on the 924.

This engine also has a full windage tray that isolates the sump oil from the rotating assembly.

Horsepower increased an average of 3% (over four pulls the data ranged from 2.5% to 3.5%). Power increased from roughly 2750rpm to 5300rpm.

Laugh! I sure wish we had the money to actually be one of those "As-Seen-On-TV" people."

Kind regards,

Kevin Johnson

Ishihara-Johnson Crank Scrapers
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924RACR  



Joined: 29 Jul 2001
Posts: 8280
Location: Royal Oak, MI, USA

PostPosted: Sat Sep 11, 2004 1:11 am    Post subject: Reply with quote

Very interesting! 3% on a Metro engine... just enough to whip the cream off a custard, as the Brits say? Still, interesting to see such a gain even with a stock windage tray.

Welcome to our forum!

I'm hoping to get my car on a Dynojet before too much longer here, now that it's broken in. Of course, it's not entirely stock, being race prepped - 9.5:1 CR and 0.040" overbore, balanced and blueprinted... but other than that and a race exhaust, it's fairly stock... will be sure to post results...
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Vaughan Scott
Webmeister
'79 924 #77 ITB racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype
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Kevin Johnson  



Joined: 11 Jul 2004
Posts: 8

PostPosted: Wed Sep 15, 2004 4:31 am    Post subject: Reply with quote

Just heard back from a Honda racing team that received some scrapers for evaluation about 7 months ago. They picked up between 1.5% and 3% hp depending on rpm with the D16 scraper -- this despite the girdle structure that runs along the mains.

Kevin



924RACR wrote:
Very interesting! 3% on a Metro engine... just enough to whip the cream off a custard, as the Brits say? Still, interesting to see such a gain even with a stock windage tray.

Welcome to our forum!

I'm hoping to get my car on a Dynojet before too much longer here, now that it's broken in. Of course, it's not entirely stock, being race prepped - 9.5:1 CR and 0.040" overbore, balanced and blueprinted... but other than that and a race exhaust, it's fairly stock... will be sure to post results...
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MikeDanger  



Joined: 21 Nov 2002
Posts: 490
Location: Denver

PostPosted: Fri Sep 17, 2004 2:22 pm    Post subject: Reply with quote

do you make them for the 944 turbos?
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Kevin Johnson  



Joined: 11 Jul 2004
Posts: 8

PostPosted: Fri Sep 17, 2004 8:55 pm    Post subject: Reply with quote

MikeDanger wrote:
do you make them for the 944 turbos?


Hi Mike,

I would love to -- I just need access to a short block for measurements. Hoepfully someone in the FL area will be able to lend one out.

Kind regards,

Kevin
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MikeDanger  



Joined: 21 Nov 2002
Posts: 490
Location: Denver

PostPosted: Sat Sep 18, 2004 1:00 am    Post subject: Reply with quote

check with broadfoot racing i believe they are in florida
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