Pelican Parts
Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help

Go Back   Pelican Parts Forums > Porsche Forums > Porsche 914 & 914-6 Technical Forum

LinkBack Thread Tools Rate Thread
Thread Post New Thread    Reply
Registered User
Join Date: Nov 1999
Location: Montegut, Louisiana, USA
Posts: 20
Send a message via ICQ to abe914
2.0L FI limits

Is there anyone out there who is running a larger crank (say a 78mm) and utilizing the stock 2.0L fuel injector system?
If so, what kind of performance are you having? Don't want to start a FI-Carb
battle, just wondering?
If the 2.0L system is limited and can't cope with this set-up, who makes a better "mouse trap" fuel injector system.

Houston in Louisiana
Old 01-19-2000, 09:14 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #1 (permalink)
Registered User
John Rogers's Avatar
Join Date: Dec 1969
Location: chula vista ca usa
Posts: 5,206
The stock system is good to about 7000 RPM on a 2.0l engine. It runs out of air/fuel moving capacity above that sort of a soft rev limiter? I have seem a couple of examples of 2.2l engines with the FI WEB cam and larger injectors and they work okay but they could have made more power with an aftermarket system. After market FI systems seem to be more expensive than carbs and check out the links on as there are several FI makers for type IV engines listed there. Good luck.
Old 01-19-2000, 01:24 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #2 (permalink)
Dave at Pelican Parts's Avatar
Join Date: Dec 1969
Location: Silly-Con Valley
Posts: 14,061
Send a message via AIM to Dave at Pelican Parts Send a message via Yahoo to Dave at Pelican Parts
I know someone locally who has a 2.2 liter that is running a "tweaked" D-jet FI. He reports zero problems so far with it.

The stock FI actually doesn't time the injector pulses very well at all. As a matter of fact, since it fires the injectors in pairs, one injector of each pair squirts fuel at its intake valve when that valve is opening. The other one in that group squirts at a closed intake valve. The fuel sits there in the intake port until the valve opens to let the mixture into the combustion chamber! Changing that by a few degrees won't have much if any effect.

Futhermore, I cannot see how changing the stroke of the crank would have any effect on the valve train. After all, the valve train works purely off of the rotation of the camshaft. Simply putting in a long-throw crank wouldn't have any effect on the camshaft unless you installed the crank wrong.

It can be done, and it can be made to work at least for a mild 2.2 motor. You might wind up close to "maxing out" the injectors when running at high load and high RPM. Higher-flow injectors would be needed at that point. You could also bump up the fuel pressure a few PSI, which meters more fuel per unit time injector opening, but that only goes so far.

Good luck!

Old 01-20-2000, 06:03 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #3 (permalink)

Thread Tools
Rate This Thread
Rate This Thread:


All times are GMT -8. The time now is 07:54 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page

DTO Garage Plus vBulletin Plugins by Drive Thru Online, Inc.