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Cedric
Joined: 27 Aug 2004
Posts: 2742
Location: Sweden
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 Posted: Fri Aug 30, 2024 9:22 pm Post subject: |
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| safe wrote: | | Cedric wrote: | The last torque steps feels slightly scary, im glad these engines arent known for cracking the block and pulling the studs out, like the Cosworth ford that they are made for  |
The instructions for these head studs are 90 ft/lb (122 Nm), but I wonder if this is just what the Cosworth block can handle. Because ARP seem to spec 110 ft/lb as a general torque rating for similar sized studs (12mm). |
Interesting, since you are pushing the limits on everything in this engine maybe you can experiment with the torque levels on the ARPs so I dont have to  But I think in your case the flatness of the block might be the limiting factor until its machined.
I think its a good plan to sort other things around the car before pushing it further. My first though behind the wheel wasnt that it need even more hp
Would be cool to slap the logger in there and get some acceleration times next year down a runway(100-200 should be proper quick I think), if you attend any slalom events that could be done during lunch break
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1980 924 Turbo
www.instagram.com/garagecedric/ |
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safe
Joined: 18 Mar 2017
Posts: 671
Location: Sweden
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| Posted: Thu Oct 31, 2024 12:23 am Post subject: |
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The engine is together with the new head gasket. I got a scare on the first test drive when water was pissing out of what seemed to be the head. But of was just a hose and it trickled along the engine in a misleading fashion.
Second try and it was water tight. They were out of e85 at the station so I had to run on petrol and that results in only wastegate pressure so I couldn't try any high boost. Not sure I get it out anymore before winter, I don't want it sitting with e85 in the system anyway.
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/Magnus, Stockholm Sweden
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Porsche 924 -79 NA, EFI and Turbo.
Porsche 931 -79
Porsche 911 -77, 3.2 Targa
Porsche 911 -69, 3.6, Coupe |
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Mike9311
Joined: 14 Dec 2004
Posts: 1793
Location: Chicago-ish
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| Posted: Mon Dec 02, 2024 1:57 am Post subject: |
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| Cedric wrote: |
Interesting, since you are pushing the limits on everything in this engine maybe you can experiment with the torque levels on the ARPs so I dont have to |
This made me laugh 
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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 |
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safe
Joined: 18 Mar 2017
Posts: 671
Location: Sweden
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| Posted: Fri Feb 21, 2025 2:26 am Post subject: |
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The poor rat rod has become mostly storage space this winter.
Very useful for brake and fuel lines, for the 931 in the background...
But there has been things happening...
The passenger side wiper arm failed almost 2 years ago. The rubber bushing is worn out and pops off.
Been dragging my feets because its such a hassle pulling out the wiper assembly. But I have to do it now for the biannual inspection coming up this spring.
Bulled it out drilled an tapped a hole secured it with a washer.
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/Magnus, Stockholm Sweden
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Porsche 924 -79 NA, EFI and Turbo.
Porsche 931 -79
Porsche 911 -77, 3.2 Targa
Porsche 911 -69, 3.6, Coupe |
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safe
Joined: 18 Mar 2017
Posts: 671
Location: Sweden
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| Posted: Fri Feb 21, 2025 2:34 am Post subject: |
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Installing a small display on the CAN-bus of the ECU.
Buying new injectors. The current 980cc is almost maxed out, so got some 1500cc, good for another 200 hp and the turbo won't support that.
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/Magnus, Stockholm Sweden
=======================
Porsche 924 -79 NA, EFI and Turbo.
Porsche 931 -79
Porsche 911 -77, 3.2 Targa
Porsche 911 -69, 3.6, Coupe |
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safe
Joined: 18 Mar 2017
Posts: 671
Location: Sweden
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| Posted: Fri Feb 21, 2025 2:36 am Post subject: |
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Also taking some measurements on the flywheel for possible later upgrades of the next weak link.....
Had to use some ingenuity without a large enough calipers.
If someone is interested the PCD of the bolts and dowels are 250.0 mm.
The bolts are evenly spaced around the circle slight variation of 0.1 to 0.4 mm.
The three dowels (6mm) are also evenly spaces between each other and very precisely so.
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/Magnus, Stockholm Sweden
=======================
Porsche 924 -79 NA, EFI and Turbo.
Porsche 931 -79
Porsche 911 -77, 3.2 Targa
Porsche 911 -69, 3.6, Coupe |
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safe
Joined: 18 Mar 2017
Posts: 671
Location: Sweden
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| Posted: Fri Feb 21, 2025 2:44 am Post subject: |
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Some new engine parts for the "proper" engine has been ordered, more on that when they arrive.
_________________
/Magnus, Stockholm Sweden
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Porsche 924 -79 NA, EFI and Turbo.
Porsche 931 -79
Porsche 911 -77, 3.2 Targa
Porsche 911 -69, 3.6, Coupe |
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Mike9311
Joined: 14 Dec 2004
Posts: 1793
Location: Chicago-ish
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| Posted: Fri Feb 21, 2025 9:02 am Post subject: |
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You use mill vice parallels like i do (not sure what you would call them over there? Its that wooden box next to the flywheel)
_________________
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 |
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morghen
Joined: 21 Jan 2005
Posts: 9044
Location: Romania
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| Posted: Fri Feb 21, 2025 5:20 pm Post subject: |
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I see this getting power from the 924 engine may have turned into an obsession
But if you change the internals, its not really the same engine, so whats your record while still keeping it "stock" ?
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Supercharger and EFI kits
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safe
Joined: 18 Mar 2017
Posts: 671
Location: Sweden
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| Posted: Fri Feb 21, 2025 6:30 pm Post subject: |
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| Mike9311 wrote: | | You use mill vice parallels like i do (not sure what you would call them over there? Its that wooden box next to the flywheel) |
Yes, useful tools as spacers. I think we call them "parallelbitar", pretty close to Parallels.
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/Magnus, Stockholm Sweden
=======================
Porsche 924 -79 NA, EFI and Turbo.
Porsche 931 -79
Porsche 911 -77, 3.2 Targa
Porsche 911 -69, 3.6, Coupe |
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safe
Joined: 18 Mar 2017
Posts: 671
Location: Sweden
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| Posted: Fri Feb 21, 2025 7:20 pm Post subject: |
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| morghen wrote: | I see this getting power from the 924 engine may have turned into an obsession
But if you change the internals, its not really the same engine, so whats your record while still keeping it "stock" ? |
Maybe...  
The internals is a later mod, biggest reason will be to raise the revlimit, lighter pistons and rods, for a larger powerband, bringing in boost later to reduce the torque.
The pistons I've had for a long time.
But that will also depend on the head and camshaft if it can flow on higher rpms.
I still think the stock engine is good for 500hp, but clutch, torque tube, gearbox, driveshafts not so much....
So my biggest issue right now is that the gear linkage is horrible, its a frankenstein linkage done by a previous owner. The syncros on 1st gear is almost non functioning and I really don't want to grenade the gearbox because it's quite rare (I do have spare gearbox and torque tube...).
So to me the logical thing is to get a proper gear linkage and a G31 with TT before adding more boost, but that will happen when I get time .
Getting the 931 in the picture above on its running gear again (and actually running) is higher priority because I need the shop space next winter. I might need an EFI kit for that! But I'll try to get the k-jet "working".
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/Magnus, Stockholm Sweden
=======================
Porsche 924 -79 NA, EFI and Turbo.
Porsche 931 -79
Porsche 911 -77, 3.2 Targa
Porsche 911 -69, 3.6, Coupe |
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morghen
Joined: 21 Jan 2005
Posts: 9044
Location: Romania
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| Posted: Fri Feb 21, 2025 7:49 pm Post subject: |
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I think i had one of those NA snailshell gearboxes somewhere...not sure if i sent it to scrap or not, i'll look in the weekend if i still have it.
You can surely have a kit for that 931 if you want.
Would probably be a good idea if you had one as you'd surely refine the tune and settings even further so others could benefit from that as well if you share the tune. I sold my 931 so i cant do any work on that application anymore.
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safe
Joined: 18 Mar 2017
Posts: 671
Location: Sweden
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| Posted: Wed Mar 12, 2025 6:32 am Post subject: |
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The clutch to rule all the clut... power!
This will hold more torque than even I can dream of getting from the mighty 2.0.
I'm 99% sure it will work. Not getting to installing it until I've beefed up the gearbox.
Bolts on to the flywheel, splines that fit both the turbo torque tube and the NA.
_________________
/Magnus, Stockholm Sweden
=======================
Porsche 924 -79 NA, EFI and Turbo.
Porsche 931 -79
Porsche 911 -77, 3.2 Targa
Porsche 911 -69, 3.6, Coupe
Last edited by safe on Wed Mar 12, 2025 6:36 am; edited 1 time in total |
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Mike9311
Joined: 14 Dec 2004
Posts: 1793
Location: Chicago-ish
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| Posted: Wed Mar 12, 2025 6:35 am Post subject: |
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Ooooo how I love that you are trying something
_________________
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 |
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morghen
Joined: 21 Jan 2005
Posts: 9044
Location: Romania
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| Posted: Wed Mar 12, 2025 8:03 pm Post subject: |
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Awesome find!
Curious how it will work out.
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