924Board.org

Juho · Joined: 03 Oct 2018 Posts: 377 Location: Finland

I am going to track my 924 frequently when its finished so is it worth the $$$.
What is difference with normal and teflon version, which one i should get? https://www.crank-scrapers.com/Porsche_924.html

Accusump im getting 100%

Cedric · Joined: 27 Aug 2004 Posts: 2608 Location: Sweden

Juho · Joined: 03 Oct 2018 Posts: 377 Location: Finland

Would you recommend going mittelmotor baffle rather than windage setup.

924RACR · Posted: Wed Mar 31, 2021 8:40 pm Post subject:

We've been using the CrankScrapers plain steel scraper for many years. Maybe 15?

For sure the Accusump is the more critical component... but the scraper is definitely worth having, if you have the motor open and time to fit it.

I had to grind down the head of one of the main bearing bolts (last one at the back) to get the oil pan to clear, due to the added thickness of the scraper.

You may likewise need the ability to grind the scraper to fit, as needed, around your rods.

We put a teflon version on my buddy's 944S2 track car motor; can't really speak to an advantage, though theoretically you can run zero clearance... for more efficient scraping...

On the one hand, the teflon design being multiple pieces would have more points of failure. OTOH, my plain steel has broken into two pieces at one weak point. Not that it matters, anyway; there's still enough attachment points on the mains caps to secure both pieces, still works fine.
_________________
Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

Juho · Joined: 03 Oct 2018 Posts: 377 Location: Finland

are you using full windage setup or only scrapers?

924RACR · Posted: Wed Mar 31, 2021 9:24 pm Post subject:

Ah, sorry - scraper only.
_________________
Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

Fifty50Plus · Posted: Thu Apr 01, 2021 2:11 am Post subject:

I'm using the steel crank scraper and an AccuSump system on my car. No oil pressure drops anywhere on track based on full data acquisition. The prior car that I had was outfitted the same way and the new owner lost an engine after forgetting to open the AccuSump during a session. As others have said, I'm not really sure that a crank scraper is necessary. But it sounded like a good idea when I started building 924 engines to race.
I did a lot of work with pan baffles on some BMWs that I raced and still had bearing problems until I started using AccuSumps in the mid '90s. I'v not lost an engine since.
AccuSump WORKS!
_________________
1979 924 NA race car
1982 924 NA race car - Sold
1982 924 Turbo almost a PoS
1981 924 Turbo a real PoS, new engine
1982 924 Turbo nice body, blown engine
1972 911 E race car - going to Vintage
Various 944s to become IT-S race car

Mike9311 · Joined: 14 Dec 2004 Posts: 1678 Location: Chicago-ish

I am thinking strongly about accusump myself but it may all change dramatically when I get my oil squirter set up figured out

Windage tray set up on CS. Seems like there is much work to be done regarding fitment especially to the pan as mentioned

_________________
1980 931 since 1989
1981 Ideola 931 Club Sport
1982 931 Entwicklungsfahrzeug
1979 924 NA ohne 650 mit 471
1982 931 Red Resurrection - 951 IC
1982 931 parts car / resurrection?
1980 924 NA (R&D lightweight)
1982 931 wana-be GTR race car

924RACR · Posted: Fri Apr 02, 2021 1:08 am Post subject:

Oil squirter won't change anything about the oil pump sucking air, unless I misunderstand?

Hell, I have a dry sump on my P2, and at one of our local MI tracks (Grattan) it'll catch air twice a lap... one of which can be taken at full throttle at about 10000-11000 RPM! Most cars have to lift before that point to brake enough to make the next corner... but not the prototype. But if I go WOT over it, the oil pump still sucks air because negative g's, and the oil pressure drops out!

So the mitigation is to simply lift over the jump... but the proper fix would be an Accusump.

Mostly - I just have to avoid that track if I have a motor I care about...

So I'm glad we have an Accusump in the 924...
_________________
Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

Mike9311 · Joined: 14 Dec 2004 Posts: 1678 Location: Chicago-ish

gegge · Joined: 27 Jul 2007 Posts: 1124 Location: Sweden

I bought the teflon scraper for my NA and changed the teflon part for a thicker one. Wouldn´t do it again, the gain is above 6000 rpm and the 924 engine does n´t perform well at those rpms. And the cost...

Money is better spent elsewhere.
_________________
Carl Fredrik Torkildsen

924 turbo -81 Carrera GT RESTOMOD
924 turbo -80 Dolomite De Luxe
924 -85 DP kit, BBS RS, M030 and tuned engine
924s -86 Black on black turbo with Fuchs