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My "Rat rod" 924 NA turbo conversion.
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Cedric  



Joined: 27 Aug 2004
Posts: 2676
Location: Sweden

PostPosted: Fri Aug 30, 2024 9:22 pm    Post subject: Reply with quote

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
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safe  



Joined: 18 Mar 2017
Posts: 631
Location: Sweden

PostPosted: Thu Oct 31, 2024 12:23 am    Post subject: Reply with quote

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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