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Borken
Joined: 23 May 2015
Posts: 5
Location: Falkenberg, Sweden
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 Posted: Sat Jan 06, 2024 3:10 am Post subject: |
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Tackar och bockar!
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Jack of all trades, master of none |
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slashpua
Joined: 12 May 2024
Posts: 1
Location: Poland
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| Posted: Mon May 13, 2024 7:27 am Post subject: |
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| Great build! Do you have pictures of how you installed the intercooler? |
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safe
Joined: 18 Mar 2017
Posts: 631
Location: Sweden
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| Posted: Mon May 13, 2024 6:39 pm Post subject: |
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| slashpua wrote: | | Great build! Do you have pictures of how you installed the intercooler? |
Sure. Its not bolt on/in, I did a lot of cutting to make it fit. Including the front cross member that is mostly non existing now. I added a square tubing between the frame rails that takes up space in the bumper.
Not shown in the pictures is the actual upper and lower mounts. But I welded in a support bar above between the frame rails that holds the intercooler.
Likewise one below that holds the intercooler and radiator and valance. The intercooler and radiator is mounted very close to each other.
Lower valance air scoop. Made like the oil cooler scoops on older 911's.
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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: 631
Location: Sweden
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| Posted: Sun Aug 25, 2024 5:04 am Post subject: |
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So.... I have confirmed that the engine is pushing combustion gasses into the coolant. Not really surprised by it. No ill affects either, yet. Not sure how long its been doing it, all the time??
Its doing it somewhere between 1.5-2 bar, so it probably lifts the head slightly.
Today I removed the head to have a look and to fix an exhaust stud too.
Pictures of block and head just as removed.
It't nothing catastrophic, Nothing seems damaged, neither block, head or really headgasket. You can see on the gasket that there has been some gasses passing by since the copper finnish has been removed from it, mostly on cylinder 4.
I've cleaned it some after this picture and it looks good enough to slap together again.
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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: 631
Location: Sweden
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| Posted: Sun Aug 25, 2024 5:11 am Post subject: |
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The block probably isn't dead straight, it wasn't to begin with.
But some good things to take away, the headgasket held up pretty good, it probably only needs higher clamping force.
The pistons hasn't melted.
There are some carbon on the pistons and head, but take a look at this exhaust port.
I'm really not sure what to think, its clean, clean-clean, fingers don't get dirty when when I rub them in the ports. All 4 are the same.
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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: 631
Location: Sweden
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| Posted: Sun Aug 25, 2024 5:14 am Post subject: |
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When I said "slap together", I'm doing that but with some upgrades. Cometic gasket and ARP head studs.
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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: 8983
Location: Romania
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| Posted: Sun Aug 25, 2024 6:52 am Post subject: |
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Nice to see the inside of that engine, impressive for factory parts.
Probably has to do with good tuning as well 
Thanks for sharing.
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Supercharger and EFI kits
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Mike9311
Joined: 14 Dec 2004
Posts: 1763
Location: Chicago-ish
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| Posted: Mon Aug 26, 2024 12:13 am Post subject: |
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How I love this build 
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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: 631
Location: Sweden
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| Posted: Mon Aug 26, 2024 6:39 am Post subject: |
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| Mike9311 wrote: | | How I love this build |
Amazingly stout little engine!
Found the limit for stock parts, lets see what some easy upgrades will do!
Engine is back together, almost, one exhaust bolt is messing with me!
122Nm on the new head bolts. Felt like quite a lot.
_________________
/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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Beartooth
Joined: 05 Apr 2022
Posts: 255
Location: Roberts, MT
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| Posted: Mon Aug 26, 2024 11:48 am Post subject: |
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Darned impressive you got this far; I think you mentioned you hadn't opened the engine up at all (original head gasket), correct me if I'm wrong. Given that you got this far, I'd think between truing the gasket surfaces, head studs, and an upgraded head gasket, you should be able to push quite a bit farther. I'd think there's a pretty good chance you'll find the limits of the pistons before the head gasket, but only one way to find out!
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1980 931 diamond in the rough |
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Cedric
Joined: 27 Aug 2004
Posts: 2700
Location: Sweden
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| Posted: Mon Aug 26, 2024 4:11 pm Post subject: |
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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
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1980 924 Turbo
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safe
Joined: 18 Mar 2017
Posts: 631
Location: Sweden
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| Posted: Mon Aug 26, 2024 6:35 pm Post subject: |
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| Beartooth wrote: | | Darned impressive you got this far; I think you mentioned you hadn't opened the engine up at all (original head gasket), correct me if I'm wrong. Given that you got this far, I'd think between truing the gasket surfaces, head studs, and an upgraded head gasket, you should be able to push quite a bit farther. I'd think there's a pretty good chance you'll find the limits of the pistons before the head gasket, but only one way to find out! |
It was "rebuilt" so new bearings, new rings (properly gaped for boost) and new head gasket. But stock stuff. I didn't touch the deck it wasn't something I could do in my shed.
The head was fly cut, new guides and lightly ported, mostly just cleaned up. It was made to go on my good prepared engine, that's still not finished, that's for the next iteration (properly prepared block, forged pistons, rods, balanced etc) .
I built the turbo kit on this engine, but the cam was so worn the engine was full of metal so I had to pull it apart. That's why I had to use my good head.
But I also stared on getting my 931 done, welded a bunch of rust, prepared and restored parts (blasting, zink plating, powder coating etc) already. I have to get that car moving so I can pull in my 911 -69 (track car) for rust repairs instead.
So the new engine for this car keeps getting pushed down the list of stuff to do.
_________________
/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: 631
Location: Sweden
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| Posted: Mon Aug 26, 2024 6:52 pm Post subject: |
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| 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).
_________________
/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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Beartooth
Joined: 05 Apr 2022
Posts: 255
Location: Roberts, MT
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| Posted: Tue Aug 27, 2024 8:40 am Post subject: |
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| safe wrote: | It was "rebuilt" so new bearings, new rings (properly gaped for boost) and new head gasket. But stock stuff. I didn't touch the deck it wasn't something I could do in my shed.
The head was fly cut, new guides and lightly ported, mostly just cleaned up. It was made to go on my good prepared engine, that's still not finished, that's for the next iteration (properly prepared block, forged pistons, rods, balanced etc) .
I built the turbo kit on this engine, but the cam was so worn the engine was full of metal so I had to pull it apart. That's why I had to use my good head.
But I also stared on getting my 931 done, welded a bunch of rust, prepared and restored parts (blasting, zink plating, powder coating etc) already. I have to get that car moving so I can pull in my 911 -69 (track car) for rust repairs instead.
So the new engine for this car keeps getting pushed down the list of stuff to do. |
I see, sounds like it would have been close to a factory fresh engine in terms of how much abuse the head gasket could take. Maybe the deck was a bit off and you could get a bit more out of the stock gasket and head bolts, but unless the engine had been overheated, it shouldn't have been too bad. It's funny too how you always plan to build up a motor "properly," but then have to compromise for the sake of budget, time, parts availability, etc.
I know how projects get in the way of each other too. I've been working on a shop for a while, and I hoped to have to finished in a month or so once the weather got nice this spring. Instead, I just finished it up (short of a couple trim pieces) a couple weeks ago. So I haven't even started on my 931 - that'd I'd hoped at the beginning of the year to be able to do the engine and transmission work on this year. And before I get to that, I've got an old Ford Explorer to do some transmission work on to hopefully drive this winter. Hopefully the shop makes a big difference in keeping projects moving; it should help, but like everything, it's easy to overestimate how much it will.
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1980 931 diamond in the rough |
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safe
Joined: 18 Mar 2017
Posts: 631
Location: Sweden
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| Posted: Wed Aug 28, 2024 5:41 pm Post subject: |
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| Beartooth wrote: | | safe wrote: | It was "rebuilt" so new bearings, new rings (properly gaped for boost) and new head gasket. But stock stuff. I didn't touch the deck it wasn't something I could do in my shed.
The head was fly cut, new guides and lightly ported, mostly just cleaned up. It was made to go on my good prepared engine, that's still not finished, that's for the next iteration (properly prepared block, forged pistons, rods, balanced etc) .
I built the turbo kit on this engine, but the cam was so worn the engine was full of metal so I had to pull it apart. That's why I had to use my good head.
But I also stared on getting my 931 done, welded a bunch of rust, prepared and restored parts (blasting, zink plating, powder coating etc) already. I have to get that car moving so I can pull in my 911 -69 (track car) for rust repairs instead.
So the new engine for this car keeps getting pushed down the list of stuff to do. |
I see, sounds like it would have been close to a factory fresh engine in terms of how much abuse the head gasket could take. Maybe the deck was a bit off and you could get a bit more out of the stock gasket and head bolts, but unless the engine had been overheated, it shouldn't have been too bad. It's funny too how you always plan to build up a motor "properly," but then have to compromise for the sake of budget, time, parts availability, etc.
I know how projects get in the way of each other too. I've been working on a shop for a while, and I hoped to have to finished in a month or so once the weather got nice this spring. Instead, I just finished it up (short of a couple trim pieces) a couple weeks ago. So I haven't even started on my 931 - that'd I'd hoped at the beginning of the year to be able to do the engine and transmission work on this year. And before I get to that, I've got an old Ford Explorer to do some transmission work on to hopefully drive this winter. Hopefully the shop makes a big difference in keeping projects moving; it should help, but like everything, it's easy to overestimate how much it will. |
Yeah.
I'm not sure my "proper" engine will ever be built (basically I just lack the rods) the stock one seams to be capable enough. Even the petrol tune at 1 bar and 235 whp was quick enough to be really fun.
Now everything else downstream the engine is what I worry about. Fixing gearbox issues is more important than new rods.
_________________
/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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