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914World.com _ 914World Garage _ 1973 914 2.0 Pistons
Posted by: szcesuil Jan 28 2018, 06:49 PM
My father-in-law is rebuilding the engine on a 1973 2.0. The repair manual mentions that the pistons should be domed. However, the actual pistons have more of a dwell at the top. If the pistons and crank shaft were replaced at some point, we aren't sure what would be the best way to move forward. Should we use the same type of pistons that are in there or go back to what the factory originally used? If we revert back to the factory domed pistons, would we also need to replace the crank shaft?
Thanks,
Paul
Posted by: 914Sixer Jan 28 2018, 07:12 PM
Only 1.7 pistons are domed. 2.0 USA have slight dish NOT be confused with VW bus piston which has a deep depression. Flat top Euro 2.0 are more commonly used for replacement. 5 hp better according to spec book.
Posted by: mihai914 Jan 28 2018, 07:24 PM
This is how 2.0 US spec pistons should look. As mentioned, they are dished.
Attached image(s)
Posted by: The Cabinetmaker Jan 29 2018, 07:56 AM
I've dismantled engines of all sizes. Only once have I encountered domed pistons, and they were not stock. Between the 914S on your other thread, and domed pistons, you have a lot of misinformation. What repair manual said that?
Posted by: szcesuil Jan 29 2018, 08:05 AM
This is how 2.0 US spec pistons should look. As mentioned, they are dished.
Thank you!
Posted by: szcesuil Jan 29 2018, 11:41 AM
I've dismantled engines of all sizes. Only once have I encountered domed pistons, and they were not stock. Between the 914S on your other thread, and domed pistons, you have a lot of misinformation. What repair manual said that?
He was using the Haynes Owner's Workshop Manual, Porsche 914, 4 cylinder 1969-1976. Page 11 says light alloy with steel inserts, domed crowns for fuel injection, flat crowns for carburetors. Mine is a 2.0 with fuel injection.
Posted by: McMark Jan 29 2018, 11:54 AM
If you haven't bought pistons yet, and if you're not building this engine to a racing-rule-book, then get AAPistons 96mm pistons and cylinders. Drop in ready and will work the factory fuel injection.
Posted by: MikeM Jan 29 2018, 07:53 PM
If you haven't bought pistons yet, and if you're not building this engine to a racing-rule-book, then get AAPistons 96mm pistons and cylinders. Drop in ready and will work the factory fuel injection.
Mark...does your recomendation include the 96mm flat top set for 309.00 ?
Or are you suggesting a specific set from AA?
Thanks.
Posted by: MikeM Jan 31 2018, 10:56 AM
Bump please...
Posted by: Mueller Jan 31 2018, 11:28 AM
If you haven't bought pistons yet, and if you're not building this engine to a racing-rule-book, then get AAPistons 96mm pistons and cylinders. Drop in ready and will work the factory fuel injection.
Make sure to properly gap the piston rings
Posted by: McMark Jan 31 2018, 12:27 PM
https://aapistons.com/collections/piston-liner-kits-sets/products/vw-porsche-2-0-96mm-piston-cylinder-kit-914-type-4
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