914World.com [Powered by Invision Power Board]

Posted by: Villemi Jan 5 2021, 02:26 AM

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 ?

Posted by: 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.

Posted by: Villemi Jan 5 2021, 10:09 AM

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 ?

Posted by: 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.

Posted by: Villemi Jan 5 2021, 10:29 AM

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 ?

Posted by: mepstein Jan 5 2021, 11:39 AM

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.

Posted by: 914Sixer Jan 6 2021, 06:53 AM

IF you go 2056 your MPS will need retuned.

Printable Version of Topic

Click here to view this topic in its original format