 Pistons and fuel injection US with flat pistons., Modify engine and injection for Europe caracteritics |
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| Villemi |
 Jan 5 2021, 02:26 AM
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#1
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Newbie  Group: Members Posts: 48 Joined: 7-January 20 From: France Member No.: 23,807 Region Association: France  |
Hello,
I have an US 914 Porsche birth date december 75. I want to modify the engine with a new Piston and Cylinder Set with flat pistons. Anyone do the modification ? Do you modify the fuel injection and the ECU ? Is it possible with no issues ? |
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| 914Sixer |
Jan 5 2021, 06:50 AM
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#2
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914 Guru Group: Members Posts: 8,885 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region 
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Straight up conversion. Euro Flat top pistons are 8 to 1 and USA dished are 7:6 to 1 . No fuel or ECU change. 5 hp gain.
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| Villemi |
Jan 5 2021, 10:09 AM
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#3
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Newbie Group: Members Posts: 48 Joined: 7-January 20 From: France Member No.: 23,807 Region Association: France |
QUOTE(914Sixer @ Jan 5 2021, 06:50 AM)  Straight up conversion. Euro Flat top pistons are 8 to 1 and USA dished are 7:6 to 1 . No fuel or ECU change. 5 hp gain. Thank you. I think if I use an Euro exhaust line i will have more Hp. If i use a big bore european kit (96x71) for 2056cm3 no more change for fuel and ECU too ? |
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| Bleyseng |
Jan 5 2021, 10:18 AM
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#4
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Aircooled Baby! Group: Members Posts: 13,034 Joined: 27-December 02 From: Seattle, Washington (for now) Member No.: 24 Region Association: Pacific Northwest |
Using the early style heat exchangers will increase the HP too along with the flat top pistons. You should always check your Air Flow Ratio with a wide band O2 setup as changing anything in the engine can change it.
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| Villemi |
Jan 5 2021, 10:29 AM
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#5
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Newbie Group: Members Posts: 48 Joined: 7-January 20 From: France Member No.: 23,807 Region Association: France |
QUOTE(Bleyseng @ Jan 5 2021, 10:18 AM) Using the early style heat exchangers will increase the HP too along with the flat top pistons. You should always check your Air Flow Ratio with a wide band O2 setup as changing anything in the engine can change it. Thank you Excuse me 914 worl is new for me. How do You check the Air Flow Ratio with a wide band O2 ? |
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| mepstein |
Jan 5 2021, 11:39 AM
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#6
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914-6 GT in waiting Group: Members Posts: 19,276 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region
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I’m not trying to be a smart ass but it’s probably better to check google and YouTube to get the explanation. It’s not 914 specific.
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| 914Sixer |
Jan 6 2021, 06:53 AM
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#7
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914 Guru Group: Members Posts: 8,885 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region
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IF you go 2056 your MPS will need retuned.
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